Model Engine Maker

Engines => From Kits/Castings => Topic started by: pgp001 on June 28, 2013, 11:51:45 PM

Title: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 28, 2013, 11:51:45 PM
Well I suppose its about time to let you into the workshop and see what progress has been made. I warn you now I am desperately slow and easily distracted. My problem as always is my desire to make or buy more tools.
At the moment my mind is a bit pre-occupied with a certain small jig borer that I just might be obtaining, but thats another story.

Just a bit of background so you know how I got to the stage I am at now.

Agnes was originally situated at Washpit mill in Holmfirth Yorkshire, she ran the mill for many years until retirement and was eventually relocated to the Markham Grange Steam Museum at Doncaster, luckily for me still in Yorkshire.

My late father knew the engine tenter Herbert White very well and visited him on many occasions at Washpit mill to watch Agnes in action, she was always his favourite engine. He discovered that Peter Southworth was also an admirer and was researching and building a pair of models of the engine, so back in the mid 1980's my dad approached Peter to see if he could buy some castings for Agnes.
All Peter had left after building his own two models was an incomplete set of castings that were intended as spares if anything went wrong, so my dad bought those along with a few original P&W drawings.
Peter apparently never made any scale drawings that we know of other than working sketches, and the patterns had already been given to a friend to burn (YES BURN) on his wood burning stove, so it was take what is available and make the best of it.

Moving forwards a few years, my dad made a good start on machining the main engine castings, the flywheel was a substitute from another engine in the Southworth range, but was 1" too small in diameter and not wide enough either. Even worse it was nothing like the original eight segment flywheel on the full size Agnes as it was of the type made in two halves. But that was all there was available so that is what the model had fitted.

Dad was much the same as me in that he had lots of other projects on the go at any one time, in this case it was a pair of 3" scale models of a Burrell road locomotive called "Dalesman"

Then the worst thing happened, dad was diagnosed with a rare and incurable lung disease that pretty much put paid to any heavy workshop activities in a fairly short space of time, and to cut the story a bit shorter he decided to part with the models whilst he was still able to deal with potential buyers himself. So all the models and "most" of his workshop went to new homes. I was lucky enough to eventually inherit his new Myford Super 7, and the  Alexander Master Toolmaker milling machine which you will see plenty of very soon.

Move forward thirteen years, one day I am wondering what has happened to Agnes in the intervening years, so I make an effort to track down the owner, only to discover he had not laid a  finger on her, she was exactly like the day my dad last saw her.
After some very tricky negotiations I managed to buy her back again and this is where the story really starts.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes005_zps28fd3a22.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes005_zps28fd3a22.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes001_zpsb1aa70ae.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes001_zpsb1aa70ae.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes002_zps7f2aa501.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes002_zps7f2aa501.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes007_zpsc74b812c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes007_zpsc74b812c.jpg.html)

More to follow soon. Here is a clue
Phil

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/CJ7B1067_zps8201ecb1.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/CJ7B1067_zps8201ecb1.jpg.html)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: steamer on June 29, 2013, 01:58:28 AM
Beautiful Phil!.....is the main casting a casting? or a fabrication?

Dave
Title: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: ths on June 29, 2013, 02:11:35 AM
I really look forward to seeing and hearing more about this.

Hugh.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: steamer on June 29, 2013, 02:19:16 AM
Beautiful Phil!.....is the main casting a casting? or a fabrication?

Dave

Never mind!.....note to self to read all of it first....sorry

Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on June 29, 2013, 06:24:01 AM
So Phil what have you done about drawings for her? Did your Dad redraw her? Or have you?

To put her in perspective can you let us know the size of this model?

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: MuellerNick on June 29, 2013, 09:03:26 AM
Quote
Here is a clue


That's the pattern for a new segmented flywheel.  :)


That engine looks really nice! Very promising so far.
Is the paint a very dark blue or a black?


Nick
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 29, 2013, 10:07:23 AM
The bedplate is made in three castings exactly as per full size, the overall length of the base board is 36" and the currently fitted flywheel is 11" diameter.
My dad did make his own working sketches for some of the parts you see, but in the main it has been made by scaling down the original P&W drawings that still exist for Agnes. Luckily I have full size drawings for most of the main castings and valve gear parts.

I have been corresponding with Bradford Industrial Museum, and they may have found a couple more that I do not have.
However, I am doing a full set of scale drawings in Solidworks 3D just for my own use and to make sure it all fits together.

The colour of the castings is black at the moment, but I am considering whether I should paint in the colour scheme it is now, ie burgundy.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/Agnes151_zps8f8be645.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/Agnes151_zps8f8be645.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/Agnes080_zpsb27deda9.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/Agnes080_zpsb27deda9.jpg.html)

The pattern is indeed for the flywheel segment, more of that in the next installment.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: b.lindsey on June 29, 2013, 02:49:47 PM
Lovely engine Phil, both in full and model scale. I am quite interested in how the segmented flywheel will be done too.

Bill
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 29, 2013, 11:32:02 PM
This is the stage I have got to with the Solidworks 3D assembly of Agnes (See PDF file attached below)

When Peter Southworth built his two models of Agnes, it was never his intention to add this model to his range of commercially available castings, remember I told you how he had passed on the patterns to a friend with instructions to burn them. I think that showed fairly clearly that there were no additional models planned.

At this stage I must publicly thank Bob Potter, Bob took over Southworth models when Peter died and has been an enormous help in compiling information about Agnes. It was Bob who discovered that Peters wood burning friend had not actually burnt the patterns after all, but put them in his loft and never told anyone. Bob did some negotiations on my behalf and I have now taken over as custodian of the full set of Agnes patterns, and they are currently stored safely in my loft.
Peters wishes will be honoured and no additional engines will be built using the patterns, but I will arrange to display them along with my model when it is finished, giving full credit to Peter for making them.

Prior to me becoming custodian of the patterns it was agreed that I could have a set of flywheel segments cast in order to correct the one on my model, so that is what I have done and I am sure both Peter and my dad would have approved.

The pattern you have already seen was sent to a foundry in the West Midlands, and I had nine segments cast from it, I got one extra done in case of any mishaps, so far all has gone well. It took a while to figure out a method of machining them all so they formed a perfect circle when bolted together, each one had to be exactly the same.

These are the castings.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel019_zps60915ffe.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel019_zps60915ffe.jpg.html)

The first job was to remove most of the lump left over from pouring the casting.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel002_zps2235d929.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel002_zps2235d929.jpg.html)

The problem with these is how on earth do you hold them whilst maching them, I decided that the second operation would be to machine the side faces to give some sort of flat datum to work from, so I made this hold down bridge to wedge into the casting so I could clamp it to the mill table. This was the first of quite a few special bits of tooling  :)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel017_zps898c906e.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel017_zps898c906e.jpg.html)

I used an carbide inserted cutter to face off both sides of each segment so they were all the same width, these faces will ultimately be finish machined in the lathe when the flywheel is almost built up.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel018_zps269738d3.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel018_zps269738d3.jpg.html)

There was no way I could fathom to hold these in a vice and be able to machine the angles at either end with any sort of repeatability, so I designed a holding fixture for this job. I had a lump of aluminium under the bench which was just about right luckily.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel004_zps13a876f7.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel004_zps13a876f7.jpg.html)

So let the swarf begin.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel005_zpsdf18a127.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel005_zpsdf18a127.jpg.html)

Until a few evenings later I ended up with this.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel015_zps7ea0e356.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel015_zps7ea0e356.jpg.html)

Can anyone guess how I intended to use this ?

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Maryak on June 30, 2013, 12:35:17 AM
Beautiful engine Phil,

The thing that has me intrigued with the flywheel is how the spokes are held to the centre boss. The GA has some axial circles on the boss so I am wondering are the spokes pinned axially so that the bolts spokes to rim line up?

Best Regards
Bob
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Dave Otto on June 30, 2013, 12:48:00 AM
What a nice engine.

Both of them; the full sized one and the model. I'm looking forward to watching this project progress.

Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: vcutajar on June 30, 2013, 07:34:45 AM
Fascinating.  This is going to be a super flywheel when finished.  Following along Phil.

Vince
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: FLG on June 30, 2013, 07:52:07 AM
damm these casting are beautiful!  :o you got a very detailed and interesting proyect there, I will be following with lots of interest

good luck!

Saludos
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on June 30, 2013, 07:56:36 AM
I am assuming that the flywheel segments sit in the U of the aluminium jig and the grub screws give you some sort of levelling adjustment. But  :noidea: once the segment is in the jig you can't get at them to adjust them.

Looks like a good quality pour  :ThumbsUp: Did you get some spares cast at the same time?

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: MuellerNick on June 30, 2013, 08:38:56 AM
Quote
The thing that has me intrigued with the flywheel is how the spokes are held to the centre boss.


If you look at the pictures, you see that the hub is a disk with radial bores for the spokes. The spokes are pushed into these bores and held (radially) by wedges.


Interesting construction of the flywheel!


Why wasn't the in-gate for the casting placed on the outer circumference or one of the two sides? In Germany, we do signal (to the foundry) places for gates etc. by a yellow hatching.


Nick
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: MuellerNick on June 30, 2013, 09:03:00 AM
This would be my machining sequence:
Face side 1
Flip over and face 1' (the ' means second clamping)
Face 1', 2' and 3' (all side cutting). Either in a rotary table or (easier) by CNC.
Might be worth roughing (with allowance for lathe op) the outer circumference, so you have a nice reference for the next steps.


To bore the faces 2' and 3', you need two fixtures.


Sorry if I come up with a different solution. :) But I always have to take the challenge to find a machining sequence and clamping strategy  for interesting parts like these. For me, that's just interesting and is never meant as an offense to the other.




Nick
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on June 30, 2013, 10:23:34 AM
Given the mill that you have with the ability to tilt the table I would asume the ali block goes in the vice against a vice stop you machine one face, flip the block around and machine the other.

If the mill angle is set right they will all fit together if its a fraction of the cumalative error will either mean they have to be machined again or the last segment can be made to fill more or less than 1/8th of the circle
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: steamer on June 30, 2013, 04:42:47 PM
Given the mill that you have with the ability to tilt the table I would asume the ali block goes in the vice against a vice stop you machine one face, flip the block around and machine the other.

If the mill angle is set right they will all fit together if its a fraction of the cumalative error will either mean they have to be machined again or the last segment can be made to fill more or less than 1/8th of the circle


YUP....hope you have a GOOD sine bar!... 8)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: MuellerNick on June 30, 2013, 05:21:07 PM
Quote
if its a fraction of the cumalative error will either mean they have to be machined again or the last segment can be made to fill more or less than 1/8th of the circle


If the angle is off, it will only change the diameter.


Nick
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 30, 2013, 05:58:10 PM
Well both Jason And Dave have the right idea but its not quite how I did it.

The next step was to attack the castings with an angle grinder to remove any lumps and bumps, the final finish will be corrected with filler and paint towards the end.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel023_zps737e3a1f.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel023_zps737e3a1f.jpg.html)

I thought it might be an idea to get under the skin in the critical areas with a roughing cut, the last thing I needed on the finishing cuts was to hit a hard spot and blunt the cutter before all the segments were finished.
Here is the first cut holding them in a normal vice.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel026_zps19676247.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel026_zps19676247.jpg.html)

Agian the vice was used to hold them for the second face to be cut, I uded my digital angle gauge to get them positioned somewhere near flat.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel028_zps239b5d50.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel028_zps239b5d50.jpg.html)

This was where I nearly spoilt my one spare casting, as soon as the cutter bit into the metal it just dragged the casting over in the vice, apart from a couple of unwanted cutter marks on a face that was going to be re-machined anyway that was all that happened.
It just shows how easy it is for something to move in a vice though.
So after a bit of thought I jury rigged a back stop and approached the part from the opposite side to ensure the cut was pushing the part against the stop.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel031_zps50c89626.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel031_zps50c89626.jpg.html)

Dave mentioned a "sine bar", well I dont have a sine bar big enough, but I do have a sine table.
This is a lovely bit of kit that I normally use with a pair of centres on it for measuring tapered shafts etc.
In this case I need an angle of exactly 22.5 so I can tip the milling machine table to that angle as Jason suggested earlier.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel032_zps30b69299.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel032_zps30b69299.jpg.html)

Once I had the sine table set to the correct angle, I clamped it to the table making sure it was square to the tee slots. The mill table is then tipped up until until the top of the sine table is dead level again.
This is done by using a verdict indicator on the "Y" axis slide, I took a great deal of time over this, as any error here would be multiplied by eight when all the segments are bolted together.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel033_zps4054d830.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel033_zps4054d830.jpg.html)

Jason had the right idea about flipping the fixture round but I did not use the vice, I chose to use the rotary table to ensure repeatability.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel036_zps2d567548.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel036_zps2d567548.jpg.html)

I have drawn out the profile on Solidworks 3D, so I know what some of the key dimensions need to be. But in reality it does not matter too much if the finished size is slightly out. The most important thing is that each segment is identical.
So having machined the casting that had the least amount of spare metal first, I settled on the final cut depths and zeroed the DRO for both "Y" & "Z" axis.

This is one cut.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel037_zps7a9bd14f.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel037_zps7a9bd14f.jpg.html)

And this is the other.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel042_zps0a62b8e5.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel042_zps0a62b8e5.jpg.html)

After spinning the job 180 the same two cuts were done at the opposite end with same DRO readings, thus ensuring that relationship between the angled faces were all the same.
Jo mentioned the grub screws in the base of the fixture, these were individually adjusted to make sure there was no "rock" and that one of the machined side faces was square to the top of the rotary table.

I did use the same fixture for one other job, and that was bringing the flange thicknesses down to the correct size.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel045_zpsc9dc71e7.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel045_zpsc9dc71e7.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel046_zpsa1b1f1d4.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel046_zpsa1b1f1d4.jpg.html)

My next challenge was how to get all the holes in the correct place, there are four holes for the bolts that pull the segments together, and two in each end for the bolts that holds the spoke flanged end so that it spans the joint.
I wondered about using the same fixture and the DRO on the mill, but eventually chose a different approach.

More later.
Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 30, 2013, 06:03:12 PM
Quote
if its a fraction of the cumalative error will either mean they have to be machined again or the last segment can be made to fill more or less than 1/8th of the circle


If the angle is off, it will only change the diameter.


Nick

Nick

You are correct in one respect that the diameter will indeed change, but when you have seven segments all bolted together at the wrong angle, you will find number eight does not fit. the gap will be either too large or too small.
So you would have to make a "special" segment of a completely different size with completely different angles to try and fill the gap.
For me personally that would be a really bad thing to have to do, but in reality that is exactly how they did it on full size engines all those years ago.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 30, 2013, 06:14:19 PM
You know what it's like when you just can't wait to see if it has all worked out. Time to get the clamps out.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel049_zpsa47e869c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel049_zpsa47e869c.jpg.html)

Oh dear I have run out of clamps............I wonder if I could just balance the rest in place.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel050_zps712dcf3b.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel050_zps712dcf3b.jpg.html)

So far so good no unwanted gaps anywhere.  :whoohoo:

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: peatoluser on June 30, 2013, 06:25:34 PM
BRAVO!!!  :praise2: :praise2: :praise2: :praise2:

superb set ups and a superb outcome!

following with much interest

peter
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: steamer on June 30, 2013, 06:26:07 PM
Nice Work!

Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: kellswaterri on June 30, 2013, 06:29:02 PM
Hi Phil,
           lovely work on the flywheel, the grinder bit brings back come memories of my corliss build,
                                                       All the best and good luck with your build,
                                                                                                              John.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on June 30, 2013, 06:36:36 PM
Very nicely done Phil  :ThumbsUp:.

I am beginning to like your mill even more  :embarassed: I also like the design of those tool maker's clamps  8)

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 30, 2013, 06:41:32 PM
Jo

I made that set of little clamps nearly 40 years ago, I use them all the time.

The clever thing is they can be used "one handed" because of the knurled wheels used to tighten them up.
They are much easier and quicker to use than conventional ones.

Maybe I should patent them  ;D

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: garym on July 01, 2013, 12:05:57 AM
Hi Phil,

Fascinating engine this one. Best of luck with the project. Here is a video of the full size engine I took at the beginning of June on a visit to Markham Grange. First time I'd seen an engine with two piston rods connecting the low pressure cylinder.

https://www.youtube.com/watch?v=dekA_-WKyOg

Gary
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Alan Haisley on July 01, 2013, 06:11:01 AM
This is going to be a lovely engine.
I'm looking forward to the rest of the flywheel build since I have always wanted to see one of the segmented ones go together.
Alan
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on July 01, 2013, 07:35:38 AM
You might be interested in this, a rare opportunity to see a mill engine in build.

http://www.markhamgrangesteammuseum.co.uk/agnesrebuild.htm

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: NickG on July 01, 2013, 11:43:57 AM
Fantastic stuff Phil,

I'll be watching and admiring!

Nick
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: steamer on July 01, 2013, 12:00:50 PM
You might be interested in this, a rare opportunity to see a mill engine in build.

http://www.markhamgrangesteammuseum.co.uk/agnesrebuild.htm

Phil

Thanks for that Phil....as a member of a team that did something similar, I can appreciate the amount of work that went into that!

Dave
Title: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: ths on July 01, 2013, 12:57:09 PM
Hi Phil, fabulous work, thanks for the links.

Hugh.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on August 17, 2013, 07:33:58 PM
Come on Phil: We need an update on Agnes  8) .

Have you been doing anything? (or maybe you should donate the castings  :Love: to me so that I can finish her off for you  :naughty:)

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Bearcar1 on August 17, 2013, 09:11:53 PM
What a magnificent engine, Phil. I missed out on the initial write-up and have enjoyed it tremendously today. I applaud your tenacity in getting the setups correct and the angles all worked out. If I had done it, I most likely would have wound up with a dud. Nice job.  :ThumbsUp:


BC1
Jim
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on August 17, 2013, 10:11:15 PM
A quick update on Agnes as requested.

No progress at all in any shape or form.

Phil

P.S. See progress report on Boley Jig Borer
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on December 15, 2013, 11:07:55 PM
My thoughts are now moving towards getting on with Agnes again, I have just finished adding an inverter speed control to my Pultra lathe, so I think I am ready to continue where I left of and finish the new flywheel.

One thing that has bothered me a bit is the baseboard that Agnes is sat on, when dad made it back in the 1980's he used a slab of kitchen worktop that has a simulated tile effect to try and make it look like a floor. But to be honest I don't think it will fool anyone and in the time that has passed since he made it, the quality of finish on models at exhibitions has risen to new levels.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes007_zpsc74b812c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes007_zpsc74b812c.jpg.html)

I have been wondering about what sort of flooring to cover this with, there are a few tiles available for dolls house floors, or you can buy a silicon mould and make your own using a plaster of paris mixture with some pigment.

Anyone got any suggestions for me on this one ?

Thanks
Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: fumopuc on December 16, 2013, 05:54:04 AM
Hi Phil,
have a peek at this site ,  http://www.bloxxs.de/start.htm  (http://www.bloxxs.de/start.htm), type ZP-016 in the search window.
You should see a 24x12x2 mm tile.This is what I have  used for my last project.
Bye the way I am a fan of Agnes since I have seen the first pictures of Peters model some years ago.
The book is still laying on my desk.
Regards Achim
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on December 16, 2013, 07:00:57 AM
Phil it looks like a purfectly good building jig for now.

If you do it now is the base not going to get damaged sitting around for years whilst you finish the engine  :LittleDevil:

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: gbritnell on December 16, 2013, 12:27:08 PM
Hi Phil,
That is truly outstanding work on the flywheel. Other than the self satisfaction of knowing that it was made like the prototype I think I would have cheated a little and cast it solid with the details on the inside. It's going to be one spectacular looking engine when finished with all the links and rods moving about when in operation.
As a side note which you may or may not know, I was taught a trick when holding smooth pieces in the mill vise. Use a piece of notebook paper against the vice jaws to provide friction for the smooth surfaces. I have had the same thing happen when trying to mill parts.
gbritnell
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Ramon on December 16, 2013, 12:54:54 PM
Hi Phil,
Just caught up with your progress on Agnes  :ThumbsUp: :ThumbsUp:

That's some very impressive machining on the flywheel segments - I quite envy your facility for such elaborate machining set ups for angles   ::)

Re the base work - I would strongly not recommend using Poly-Filla for the base surface. I use this method all the time for my plastic models and have made many bases now with varying forms of texture but it has one poor attribute and that is that it is easily chipped and that shows up immediately - I've even mixed it up with coloured dye and though that eliminates the 'white blight' it still does not disguise it.

I have used kitchen top on my steam engines so far but have always looked for the surface that has a very fine evenly dimpled texture. This can be scored if desired to represent tiles or slabs depending on size and painted to disguise any printed pattern.

The other alternative is to use Formica and machine that into tile or slab sized pieces. I have recently obtained some that has a very 'slate' like finish with a fine 'brushed' texture - Ha ha - this is for the Throp engine should that ever be so lucky as to materialise.

I do have a fair sized piece of extremely dense kitchen top as described above - if you are ever down 'Suffolk way' you're more than welcome to a piece

Keep up that great work - Ramon
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on March 19, 2014, 11:10:19 PM
A bit of an update on Agnes. I have been "slowly but surely" making some progress on the flywheel.

This photo shows the full size flywheel being re-erected at it's new location in Markham Grange steam museum, as can be seen the hub is a substantial casting with eight spokes being attached using wedges to pull them into the hub.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/agnesreb04_zps38eaa0e5.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/agnesreb04_zps38eaa0e5.jpg.html)

And the flywheel fully assembled, showing how it is also wedged onto the crankshaft.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/Agnes114_zps34f9090c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/Agnes114_zps34f9090c.jpg.html)

My model will have dummy wedges, the hub will be secured using parallel keys onto four flats on the shaft, but there will be some socket grub screws fitted down under the roots of the spokes to hold everything in place.
The spokes will then be pulled into the hub using socket head screws down the centre of each spoke. Once the shaft, hub & spokes are fully assembled, the eight segments of rim can be fitted and machined in situ, then lastly the eight segments of the internal barring gear will be fitted and the teeth machined as a final operation.

The first challenge is to make a hub out of bar material so that it looks like a casting.
Here is the starting point for the hub, a chunk of 3" diameter cast iron bar.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07129-12-13_zps301ae38c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07129-12-13_zps301ae38c.jpg.html)

One side was machined to the finished profile and bored to size all at the same setting.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07331-12-13_zps4bc98f49.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07331-12-13_zps4bc98f49.jpg.html)

It was then reversed and held on a mandrel to do the other side.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07431-12-13_zps9f23d582.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07431-12-13_zps9f23d582.jpg.html)

Next transfer to the milling machine and indexing head for the eight spoke holes. These will be bored over size and then fitted with protruding sleeves to mimic the casting.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07605-01-14_zps6cb34d64.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07605-01-14_zps6cb34d64.jpg.html)

Tapping size for the M5 spoke securing screws.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07805-01-14_zpse5d96c31.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07805-01-14_zpse5d96c31.jpg.html)

Opening out for the sleeves.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07905-01-14_zpscd11d892.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07905-01-14_zpscd11d892.jpg.html)

Extra tapping size holes for hub securing screws either side of centre.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08005-01-14_zps1b3e9d7f.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08005-01-14_zps1b3e9d7f.jpg.html)

A few sleeve blanks bored to size but still to finish on outside diameter.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08511-01-14_zps84fc2629.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08511-01-14_zps84fc2629.jpg.html)

Finishing a sleeve to size on a mandrel.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08211-01-14_zpsc1397259.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08211-01-14_zpsc1397259.jpg.html)

These sleeves will not be coming out again any time soon.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08311-01-14_zps68a6aa8c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08311-01-14_zps68a6aa8c.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08411-01-14_zpsd6b3921a.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08411-01-14_zpsd6b3921a.jpg.html)

Having left to cure for 24 hours, the sleeves are machined to finished length whilst still in the indexing head.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08612-01-14_zpsd78b9118.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08612-01-14_zpsd78b9118.jpg.html)

Next lots of tapped holes.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08712-01-14_zps95e1aadc.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08712-01-14_zps95e1aadc.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08812-01-14_zps55874665.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08812-01-14_zps55874665.jpg.html)

The four equally spaced shallow keyways needed a special tool to use with my push broach to ensure they were spaced accurately. Here is one I made earlier.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07531-12-13_zpsf8423fe2.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel07531-12-13_zpsf8423fe2.jpg.html)

One keyway is broached first, then the bush is indexed around 90 for each subsequent one.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08912-01-14_zps51b2dbe5.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel08912-01-14_zps51b2dbe5.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09012-01-14_zpsa423cb58.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09012-01-14_zpsa423cb58.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09112-01-14_zpsd456112b.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09112-01-14_zpsd456112b.jpg.html)

This is what it looks like after four passes.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09212-01-14_zps79331432.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09212-01-14_zps79331432.jpg.html)

More to follow soon.

Phil


Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: zeeprogrammer on March 19, 2014, 11:26:37 PM
Nice set of pics!
Nice work too.
Very interesting.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: smfr on March 20, 2014, 02:08:01 AM
Very nice  :ThumbsUp: :ThumbsUp: Looks like that bit of CI never made it into a collet chuck :)

Simon
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: fumopuc on March 20, 2014, 05:22:53 AM
Yes Phil, very intersting indeed. I like this kind of model engineering very much.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on March 20, 2014, 07:14:54 AM
Hi Phil nice to see you back on her:

Interesting, you are actually using your Bernard multi sized collet chuck  :thinking: I must be honest I have one but I don't use it. It doesn't hold short things very well  :disappointed: Not sure which lathe you are using there, by the look of the nose it seems to have a L1 (?) fitting.

Dividing head: That looks the same as my Boxford/Harrison one but you have mounted it the opposite way round on the bed to what I do. Any reason? The dividing plates mount is on the other side  :headscratch: Mine has a boxford nose thread on it I am not sure what thread yours has got it seems finer and how have you secured that mandrel onto the nose of the indexing head: All I can see is that nut  :noidea:

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Ramon on March 20, 2014, 08:25:50 AM
Nice work Phil  :ThumbsUp: - Every little bit is a step closer  ;)

Ramon
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: ths on March 20, 2014, 12:54:30 PM
I like the way you show the full sized version, then the scale replica you're making. Nice work.

Cheers, Hugh.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on March 20, 2014, 01:12:01 PM
Thanks for the positive comments, it helps keep me motivated.

Jo
I will answer some of your questions first.
I have done my usual trick of letting myself get distracted again, Agnes has had to take a back seat for a couple of weeks as I have been devoting my attention to Tom instead ( Tom Thumb that is )
You would not believe the keyhole surgery I had to perform in order to re-wire that little motor with a new mains cable, and yes I did have to make a puller to get the armature out because there is only one removable end cap and all the connections are buried at the blind end.
The spindle must have had a knock at the pulley end at some point in its life as it was slightly bent, so I fitted new bearings and made a new spindle for it. Its a good job I had some 1/4 x 32 TPI chasers for my die head.
I have machined some registers on the spindle casting to allow guards to be fitted, so making those is my next job.

For those that don't know Tom has been in Jo's care prior to being adopted by me.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Various%20Tooling/Dumore%20Grinder/Workshop00417-03-14_zps1cbe2c3c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Various%20Tooling/Dumore%20Grinder/Workshop00417-03-14_zps1cbe2c3c.jpg.html)

Anyway back to Agnes, the Multi-size collet chuck pretty much lives permanently on the big lathe which is a Harrison L5A it has the L00 chuck fitting.
The dividing head is a Tom Senior one, it is mounted the opposite way round to what you might expect because it gives more clearance on the milling machine, if the main head is on the left I have less room because of the quill return spring on the high speed head which clashes with the raised detent pin housing on the dividing head.
As for the spindle, it is my own design, I made it to accept the smaller EC size Burnerd multi-size collets, which have a capacity up to 1" bore, so the mandrel just goes straight into the 1" collet.

(Did I mention I like collets)  ;D

Hope that is clear.
Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on March 20, 2014, 01:54:27 PM
Looking forward to seeing some use of our Dumore grinder, as I told you after XX  ;) years I had never used it. Your experiences with the wiring might explain why someone previous opted for the wrap the cracked rubber cable with insulation tape.

 :facepalm: You are right mine is the larger L0, the smaller is the "00".


I have been thinking about some collets for my two three multiple dividing/indexing heads: My 5C Stevenson's indexer is currently having a holiday with JasonB. I did think of fitting a 5C to the Elliot but with the Stevensons what is the point  :shrug: I can fit a DA200 directly to my VDH.. now should I also make an adapter for the DA180s  :noidea:

Then of course there are the Cowells ones.. I was going to let the dividing head and one of the indexing heads go with C1, but then SCO asked how much I wanted for all of it and his reaction was  :lolb: I can fit the Cowells DA200 directly to the indexer I was going to keep...

Did I mention I found another indexer hiding behind a cupboard? OK it is massive but it also comes with a universal head which takes 40int tools... maybe I should start a "what should I do with this thread for it"  :naughty:

One cannot have too many Collets  ;D

Jo

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: sco on March 20, 2014, 01:59:53 PM
It wasn't supposed to come across  :lolb: more  :o

Not having a good month at the moment - had to fork out for 4 new tyres, tax and mot and a gearbox repair.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on March 20, 2014, 02:49:03 PM
Don't worry it and the multitude of gadgets can all go on HWS when the time is right for 1500 looking nicely clock-ie, complete with all its original receipts and a load of clock making stuff :naughty:.

I know the feeling mine was four tyres, one replacement wheel :o, timing belt, service, MoT and tax  :'(

Sorry  :offtopic:

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on March 20, 2014, 11:00:12 PM
Whilst doing other jobs in the workshop I like to try and leave a machine getting on with something else. More often than not it's the shaper.

I am shortly going to need eight slices of cast iron to make the internal ring gear segments for the flywheel. Many years ago I saved an old table from a cutter grinder that got scrapped and today was its turn to get converted from scrap metal into something useful.

First job was to lop off one end in the saw to make it a manageable size for slicing.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10909-03-14_zpsc603b77a.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10909-03-14_zpsc603b77a.jpg.html)

I was going to saw the rest into slices, but I found I had a solid carbide slitting saw that would just reach through the thickness.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel11310-03-14_zpsff01d5bc.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel11310-03-14_zpsff01d5bc.jpg.html)

Nice and steady cuts on a slow power feed and all eight slices done in a couple of hours.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel11210-03-14_zps5b826f95.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel11210-03-14_zps5b826f95.jpg.html)

I have high hopes for this material it seems to machine very nicely. I am now wondering what I can convert the rest of the slab into.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on April 21, 2014, 11:16:23 PM
Hi All

I have a bit more progress to share with you.

The flywheel hub needs some pockets in the side faces to house the back of the dummy wedges.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09427-01-14_zpsbe3b7f23.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09427-01-14_zpsbe3b7f23.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09527-01-14_zpsc8282923.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09527-01-14_zpsc8282923.jpg.html)

I decided that I would finish the dummy wedges later, and get on with the spokes next. The spokes are hollow and pulled into the hub with long cap head screws, the outer end of the spokes have a round flange with webs and raised bosses for the four bolts that fasten it to the flywheel rim. So each spoke had to be fabricated from six machined parts silver soldered together.

Here is the start of an outer flange.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel06929-06-13_zps045ef7d3.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel06929-06-13_zps045ef7d3.jpg.html)

The main part of the spoke just happened to be as near as made no difference N2 Morse taper, my taper turning attachment on the Harrison lathe was already set up for that so eight spokes were done in quick time.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09701-02-14_zpsa2bb9d27.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09701-02-14_zpsa2bb9d27.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09802-02-14_zps55dded8e.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09802-02-14_zps55dded8e.jpg.html)

Here is a trial assembly to make sure they fit the hub correctly.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09923-02-14_zps28d8fb47.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel09923-02-14_zps28d8fb47.jpg.html)

You get some idea of how the spokes are going to look now.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10223-02-14_zpsbb365e7f.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10223-02-14_zpsbb365e7f.jpg.html)

So on to the Boley jig borer and start removing the unwanted metal to reveal the webs.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10326-02-14_zpse1da3fb7.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10326-02-14_zpse1da3fb7.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10727-02-14_zps8724ca60.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10727-02-14_zps8724ca60.jpg.html)

Then add some holes for the bushes that will form the raised bosses.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10802-03-14_zps5ed92e4c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel10802-03-14_zps5ed92e4c.jpg.html)

Starting to look like spokes nearly.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel11517-03-14_zpsdc571158.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel11517-03-14_zpsdc571158.jpg.html)

Now the boring bit making 32 top hat bushes.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00126-03-14_zps2b3039a8.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00126-03-14_zps2b3039a8.jpg.html)

Then final assembly with silver solder.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00230-03-14_zpsac145754.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00230-03-14_zpsac145754.jpg.html)

They looked a bit grotty at this stage.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00430-03-14JPG_zps92eab248.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00430-03-14JPG_zps92eab248.jpg.html)

But I took them to work and bead blasted them.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00631-03-14_zpsfbe9ebac.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00631-03-14_zpsfbe9ebac.jpg.html)

So we now have the hub and spokes together at last.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00431-03-14_zpsa6281c58.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00431-03-14_zpsa6281c58.jpg.html)

This assembly will eventually have the ends of each spoke finally machined to length so it fits inside the rim sections.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00831-03-14_zpsc04ff764.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Workshop00831-03-14_zpsc04ff764.jpg.html)

Next I will finish off the dummy wedges, firstly blank sheet metal discs were turned to fit the recesses in each side of the hub, along with a ring which will be loctited on last job to hold everything in place.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00117-04-14_zpse0344388.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00117-04-14_zpse0344388.jpg.html)

Again using the Boley this had the slots machined where the dummy wedges fit.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00217-04-14_zps558a0b7b.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00217-04-14_zps558a0b7b.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00118-04-14_zps3fd1277c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00118-04-14_zps3fd1277c.jpg.html)

A little bit of filing to square up the ends and they are finished.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00218-04-14_zps17825c4b.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00218-04-14_zps17825c4b.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00418-04-14_zps424d0639.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00418-04-14_zps424d0639.jpg.html)

Next up are the 16 dummy wedges. I made 8 pieces with one on each end.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00121-04-14_zpse3a23bfc.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00121-04-14_zpse3a23bfc.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00321-04-14_zpsd3c36759.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00321-04-14_zpsd3c36759.jpg.html)

The outer radius was applied with a belt linisher, then some de-burring with a fine file.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00721-04-14_zpsd9dd9446.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00721-04-14_zpsd9dd9446.jpg.html)

Before final parting off the parent metal.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00921-04-14_zps88968888.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop00921-04-14_zps88968888.jpg.html)

This is the effect I was aiming for shown on the full size engine.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/Agnes114_zps34f9090c.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/At%20Markham%20Grange/Agnes114_zps34f9090c.jpg.html)

This is my model version of it, not 100% exact but I am pleased with it.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop01121-04-14_zpsea4eba3f.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/workshop01121-04-14_zpsea4eba3f.jpg.html)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: zeeprogrammer on April 21, 2014, 11:51:54 PM
Wow! That's a bit of nice work there.
To be 100% exact you'd have to be full-size...no?
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Dave Otto on April 22, 2014, 12:33:05 AM
That's an impressive update!

Beautiful machine work.

Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Don1966 on April 22, 2014, 01:47:18 AM
I'm still trying to catch my breath here Phil. What a awesome bit of engineering and fabrication. Nicely done Phil. I differently like..................   :praise2:


Don
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: fumopuc on April 22, 2014, 05:52:32 AM
Hi Phil, as Don already said, trying to catch my breath. A lot of  parts for a single flywheel. Your work at this build is much more than impressive. Thanks for sharing all these details with us.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on April 22, 2014, 07:39:53 AM
Thanks for all the positive comments guys, it makes it all worthwhile.

Agnes has a new boyfriend, he is called Sanderson.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Sanderson%20Beam%20Engine/workshop00113-04-14_zps6d35e12b.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Sanderson%20Beam%20Engine/workshop00113-04-14_zps6d35e12b.jpg.html)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on April 22, 2014, 08:00:57 AM
Nice bit of progress there Phil, she is looking impressive  :ThumbsUp:

We both seem to share the need to house to a nice set of orphan castings  :embarassed:.

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on April 22, 2014, 08:13:10 AM
Re- Engine Castings

Watch this space, you aint seen nuthin yet. Thats all I'm saying for now.  ;D

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Ramon on April 22, 2014, 09:43:17 AM
Phil, that's a superb essay into some terrific forethought.   :praise2:

Don't let those new castings spoil the flow on Agnes though - believe me that's coming from someone who knows about these things  ::) - I'm struggling in that direction at present  :-\

Great work Phil - Ramon
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: ths on April 22, 2014, 12:42:26 PM
Thanks for the update, just wonderful.

Hugh.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Steamer5 on April 22, 2014, 10:14:23 PM
Hi Phil,
 The flywheel is a work of art! Thanks for taking the time to give us all master class on it construction.

Cheers Kerrin
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on May 12, 2014, 08:23:02 AM
I have just found some 25mm square ceramic tiles which I am considering using for the floor for Agnes, everyone goes for the diagonal pattern but I was wondering if I should be different and go for tiles in line with the engine.

Here are a couple of shots showing the sample tiles in place both ways, I think I know the answer, If you try to forget you have ever seen this type of floor before, do you guys have any opinions as to which will look the best based on the photo's.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00126-04-14_zps3273855d.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00126-04-14_zps3273855d.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00226-04-14_zps6359a09b.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00226-04-14_zps6359a09b.jpg.html)

One other option is to use just the white tiles all over. ( the tiles are a semi matt finish by the way)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on May 12, 2014, 08:47:56 AM
I always thought that these big mill engines were originally mounted on granite flags with iron access plates to the lower workings.

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on May 12, 2014, 08:57:51 AM
Jo

You are probably correct, that is why I cannot decide what to do for the best.
I have photo's of some engine houses showing this type of floor, but they are probably from a slightly later date than Agnes, so maybe I should save the tiled floor for "Bradford"

Next question, where do I get 1/16 scale granite flags  :help:

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: ths on May 12, 2014, 09:21:10 AM
A 1/16 scale quarry?
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on May 12, 2014, 11:15:32 AM
Here is one of mine with the tiles square on

(http://img.photobucket.com/albums/v156/jasonballamy/Engineering/Beam1.jpg)

By a strip of worktop edging for a granite eddect worktop and cut into suitable squares. Its just Formica type high pressure laminate and can be stuck down easy enough. Or plaster the base and scribe in the joints and finally paint as any granite you by will have a full size pattern not 1/16th

I also doubt that the victorian tiles were 16" square, 6" is more likely so you want 3/8" on the model or 8" at a push at 1/2"
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on May 12, 2014, 01:01:45 PM
I still need to give a lot more thought to the floor options, in the meantime I have been working on the flywheel though.

In order for me to make a form tool for slotting the 200 barring ring teeth, I needed to produce the mating gear for the barring engine.

Here it is being machined on my little Mikron hobber.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00426-04-14_zps2d99bb18.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00426-04-14_zps2d99bb18.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00326-04-14_zpsddfa6603.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00326-04-14_zpsddfa6603.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00526-04-14_zpsd8f21ca9.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00526-04-14_zpsd8f21ca9.jpg.html)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00626-04-14_zps2c60d05f.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00626-04-14_zps2c60d05f.jpg.html)

Well actually I made three all at the same time, it takes only a few seconds longer to machine the teeth.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00726-04-14_zpsbe1e3d8d.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00726-04-14_zpsbe1e3d8d.jpg.html)

Here they are laid over the barring ring drawing just to give an idea of how they fit.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00826-04-14_zps32f4e36a.jpg) (http://s456.photobucket.com/user/pgp001/media/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop00826-04-14_zps32f4e36a.jpg.html)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: NickG on May 14, 2014, 02:41:46 PM
Brilliant gears, think I prefer the tiles straight on.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Rivergypsy on May 15, 2014, 12:57:42 PM
Just a thought, but finding a friendly stonemason with a diamond saw could be a source of custom cut granite?

Stunning work by the way - I'm seriously impressed  :ThumbsUp:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Alan Haisley on May 15, 2014, 03:59:55 PM
I have just found some 25mm square ceramic tiles which I am considering using for the floor for Agnes, everyone goes for the diagonal pattern but I was wondering if I should be different and go for tiles in line with the engine.
Phil,
Perhaps most people go for the diamond pattern because the square pattern will show up slight misalignments between the tile and the  engine.
Alan
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: cfellows on May 15, 2014, 04:20:52 PM
Thanks for all the positive comments guys, it makes it all worthwhile.

Agnes has a new boyfriend, he is called Sanderson.

Phil

I have a set of Sanderson castings.  Unfortunately, the cylinder casting was no good, so I'm going to have to fabricate or machine another one.

Chuck
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: steamer on May 15, 2014, 06:12:32 PM
Or ....possibly.....if you befriend the local countertop shop....you could cut them from Corian.

Lot's of possibilities there.

Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: b.lindsey on May 16, 2014, 12:44:22 AM
Phil, I am playing catch-up again on this build but its incredible. The gears and tiles all look great (whichever way you decide to orient them), but that flywheel is fantastic...so much detail. Still watching even if quietly.

Bill
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on October 28, 2015, 01:16:02 PM
Crikey, I had not realised how long it was since I posted an update on Agnes.

The truth is, there is no update  :ThumbsDown: In fact I have not actually made anything in the workshop for exactly a year now.

I decided last October to have another go at learning to "play" Acoustic Guitar, as opposed to "playing with" it from time to time.
The trouble is, I don't have enough time to devote to everything at once, I started taking (and paying for) guitar lessons, so I have spent all my spare time over the last year sat practicing and learning.
I will not be forming a band any time soon, but my wife has suggested that when I retire I could go stand on a street corner and do some busking  :lolb:

Anyway, the last bit of news on Agnes was that I took the part finished flywheel to our annual Bradford club exhibition last December, and won a rather large silver trophy for best unfinished model.

The next job on the flywheel is turning the rim to size and producing the rope grooves on the outer diameter, the trouble was my lathe runs a tad too fast and Iwas afraid of spoiling the job with chatter marks etc.
So last weekend I have bitten the bullet and bought a new three phase motor and fitted a spare inverter I had been saving. The lathe will now run at a suitable speed for the job so I have no excuses not to start making some swarf again.
One thing I am not really looking forward to is cutting the 200 internal gear teeth for the barring engine one at a time with the slotting head.

I think I might have mentioned a couple of years ago that I am a bit slow  ;D

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Alan Haisley on October 28, 2015, 05:37:05 PM
Phil,
At least you can get away with showing the first couple and last couple of gears being made.  :Jester:
Alan
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: ths on October 30, 2015, 09:25:38 PM
Slowhand? Hugh.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on April 08, 2016, 05:10:47 PM
Here is the latest update on progress, yes I have actually made some !!
I will keep the words to a minimum and let the photo's explain.............Any questions just ask.

Phil

Since the last installment, the flywheel in its part finished state won me a big silver cup at the Bradford Model Engineering Society annual exhibition.
After I brought it home from there it was totally stripped down again to allow the inside face of the eight main segments to be fettled up a bit with some filler and smoothed off ready for painting. Then it was put back together for the last time for the final machining operations to add the 200 teeth for the barring engine ring gear, and the 18 grooves for the rope drive on the outside face.

Here it is having the crank side face machined, this will be a datum face later on.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20160%2029-03-16_zpskdqrf2dd.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20162%2029-03-16_zpsj000o0ax.jpg)

Now the outside diameter is being cleaned up true for the first time in the lathe, this will also be a datum and still needs another finishing cut later on.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20165%2031-03-16_zpsblkyyr5r.jpg)

The segment joints need to be relieved in the area where the barring ring gear is to be fitted.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20168%2001-04-16_zpsfq1yxb0x.jpg)

This shows the blanks for the eight segments laid out on my flywheel drawing to make sure they will fit OK.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20170%2001-04-16_zpsuwwsalqi.jpg)

The gear blank segments are clamped in place and then drilled for countersunk screws to hold them to the flywheel.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20173%2002-04-16_zpsch8honea.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20174%2002-04-16_zps7bxjlxkm.jpg)

Obviously two screws is not enough, so I ended up with five in each.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20175%2002-04-16_zpspfulazo7.jpg)

Then mill away the bulk of the material to get it round inside.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20176%2002-04-16_zps7y6pcu4y.jpg)

Then round outside.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20179%2002-04-16_zpszgnu00zt.jpg)

Then back onto the lathe to face the thickness to size and finish the inside diameter to size ready for its teeth.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20180%2002-04-16_zpskbsucx2u.jpg)

To save the single point gear tooth cutter having to remove too much metal. I drilled some of the tooth away first, this meant 200 indexes on the rotary table. You do not need any interuptions while doing this.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20183%2003-04-16_zpsuusqng1u.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20185%2003-04-16_zpstas32h4f.jpg)

Then swap the high speed head for the slotting head.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20186%2003-04-16_zpsrvkzxi24.jpg)

And start another 200 indexes to cut each individual tooth. I made a dead stop on the Y Axis so I could not go too deep by accident.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20187%2003-04-16_zpssa5ontfw.jpg)

Boy did I breathe a sigh of relief when I got to this point.  :ThumbsUp:

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20189%2004-04-16_zpsmqu4phnd.jpg)

Then it went back in the lathe to finish the outside diameter for the final time, I have fitted an inverter so I can run the lathe down to about 10 rpm, the final pass on a slow feed took about half an hour.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20193%2005-04-16_zpsqqqjiwqp.jpg)

Note the big lumps of lead to stop the overhanging tool chattering.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20194%2005-04-16_zpsbfygpfvl.jpg)

Once the outside diameter was finished the 18 rope grooves were added, I made a special form tool for this as the grooves are tapered with a radius in the bottom but start off with parallel sides as per the original drawings.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20196%2005-04-16_zpsklcddhk4.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20197%2005-04-16_zps63wg9l8a.jpg)

And finally the finished result, I say finished but the countersunk screws will be filled over prior to painting, I do not agree with being able to see modern fasteners on models of old engines.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20201%2007-04-16_zps6swvmhu4.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20202%2007-04-16_zps47nwvusn.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20203%2007-04-16_zps4lefs7a1.jpg)

My main objective was to make the flywheel as true to prototype as possible, the biggest fear I had was that you would be able to see the joints between the eight segments, so I have been a bit paranoid about making sure everything was checked and double checked along the way. I am very pleased with the way it has turned out and I can put that worry behind me.

I think I might make the barring engine next, see you in a year or so  ;D

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Roger B on April 08, 2016, 05:26:40 PM
Glad to see you back on this  :ThumbsUp:  :ThumbsUp: I'm looking forward to seeing how you cut the gear  :headscratch:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on April 08, 2016, 05:38:00 PM
Roger go back and have another look, I added more photo's in the last few minutes.

Phil

P.S.

Can anyone guess how many separate bits of metal including fasteners are in that flywheel ?
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Roger B on April 08, 2016, 06:14:39 PM
Thank you  :ThumbsUp: Looking at the pieces in each spoke I would think 5-600 in total  ::)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Don1966 on April 08, 2016, 06:29:13 PM
Phil that work is jaw dropping. It is well thought out and executed and the results speak for itself. Awesome mate.......... :praise2:

Don.  :wine1:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Tennessee Whiskey on April 08, 2016, 06:35:42 PM
I'm gobsmacked,  simply beautiful  :ThumbsUp: :ThumbsUp:.

Cletus
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: joe d on April 08, 2016, 07:59:26 PM
Phil

This was worth the wait :ThumbsUp: :ThumbsUp:

Joe
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on April 08, 2016, 08:13:10 PM
I know how many  ;) but won't spoil the game for others. Very nice Phil and gfood to see what you have been upto over the winter.

J
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: vcutajar on April 08, 2016, 08:23:14 PM
Very beautiful.  That is a project on it's own.  Good thing you are not going to cover the inside of the flywheel with wood.

Vince
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: crueby on April 08, 2016, 08:36:58 PM
Magnificent job on the flywheel! Clever way to do the wedge ends.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on April 08, 2016, 08:44:35 PM
I know how many  ;) but won't spoil the game for others. Very nice Phil and gfood to see what you have been upto over the winter.

J

Jason

I have had a re-count, and I think the figure you have will be wrong anyway.

As for "over the winter", the additional work you see here has been done over the last ten evenings. I had set an un-offical target of finishing the flywheel before I was 60.
So I have done with a day to spare.  :old:

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Ramon on April 08, 2016, 08:48:52 PM
Absolutely superb result Phil - a beautiful piece of machining if ever I saw one - it's going to be a true masterpiece when finished  :ThumbsUp: :ThumbsUp:

Happy birthday for tomorrow too but make the most of the next ten years - it disappears in a flash and for you know it you're seventy (plus)  ::)

Regards - Ramon
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Johnb on April 08, 2016, 09:51:44 PM
Lovely!
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: zeeprogrammer on April 08, 2016, 10:06:12 PM
Nice birthday gift I'd say. Awesome.  :ThumbsUp:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: b.lindsey on April 08, 2016, 11:55:41 PM
Amazing work!! Well worth waiting for ....Happy Birthday too.

Bill
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: gbritnell on April 09, 2016, 12:01:50 AM
What a fantastic piece of work on the flywheel! The details are outstanding.
gbritnell
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: kvom on April 09, 2016, 01:13:58 AM
Great work, and very well documented too.   :ThumbsUp:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: fumopuc on April 09, 2016, 06:45:25 AM
Hi Phil, happy Birthday. This flywheel is real a masterpiece. Thank you very much for showing all the way to make it. To put some weight on the cutter while machining with low revs and the big overhang of the cutter is a good tip to keep in mind.
Waiting for the barring engine now.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Alan Haisley on April 09, 2016, 01:32:20 PM
I really love the picture of the last index point. It's so nice when two ends of a gear come together.  :ThumbsUp:

Alan
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on April 09, 2016, 05:00:27 PM
Thanks for all your nice comments guys, much appreciated.

I decided to take a hammer and chisel to the base board of the model and remove enough of it to allow the new flywheel to sit in its bearings.
I was desperate to know for sure that it runs true, and it is absolutely spot on so I am well chuffed.

Here are just a few of what it looks like now, and one with the old flywheel for comparison.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20205%2009-04-16_zpscjayckzi.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Flywheel%20206%2009-04-16_zpsypv7zvxa.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Agnes%20Flywheel/Agnes%20013_zpsuznwfpt7.jpg)

For those that are still wondering, there are 274 parts in the new flywheel.

Phil

P.S.
I have a very nice 11" flywheel that is now surplus to requirements if anyone happens to be looking for one.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: crueby on April 09, 2016, 08:05:40 PM
Wow - that is looking fantastic!
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Roger B on April 09, 2016, 08:16:40 PM
Well my 5-600 was a bit high, but you have put a huge amount of effort into that flywheel  :ThumbsUp:  :ThumbsUp:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: sco on April 09, 2016, 08:20:13 PM
Wow - that is looking fantastic!

I second that, love the flywheel in particular!

Simon.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 03, 2016, 09:34:11 PM
I am getting on fairly well with the barring engine at the moment and I promise to upload some more photo's very soon.

But I have a little problem that I need to solve, do you guys have any bright ideas how to machine the three pronged sprag coupling parts as per this photo of the full size one.
Bearing in mind it will only be around 1/2" diameter on the model.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/Agnes%20At%20Washpit%20Mill/22-023_zpsrwlrpecx.jpg)

One half is burried inside the pinion that engages with the main engine flywheel, and the othe half is pinned onto the cross shaft of the barring engine.
There is going to be some sort of spiral or helical milling going on here, but I havn't decided on the best method yet.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on June 04, 2016, 07:29:29 AM
Phil with that milling machine of yours I would have thought you would gear the table to a dividing head and use a small dia cutter to cut the three helical ramps of the coupling.

Another option would be to draw it out in CAD and work out a few offsets for say 5 or 10 degree increments of rotation. You will probably need this for the one in the gear or solder in a sleeve with the three teeth cut.

If you can do without a helical ramp and just go for a flat then its just a case of indexing teh part round as its held at an angle and milling the three faces. You would get a 3 start version of this

(http://img.photobucket.com/albums/v156/jasonballamy/Hit%20n%20Miss/Half%20Scale%20Gade/HPIM1333_zps4dtdapcc.jpg)

Although the angle is less than yours a file works well too!

(http://img.photobucket.com/albums/v156/jasonballamy/Hit%20n%20Miss/1-3rd%20Scale%20Allman%20c1890/DSC00943_zpshnpjiaca.jpg)

(http://img.photobucket.com/albums/v156/jasonballamy/Hit%20n%20Miss/Third%20Scale%20VJ%20Monitor/DSC00185_zpsiyydhiel.jpg)

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on June 04, 2016, 07:36:16 AM
Looks like a job for Tgs slotting head  ::) or a shaper

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on June 04, 2016, 07:44:01 AM
Jo whats the best way to generate the helix when using the slotter or shaper?
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on June 04, 2016, 07:48:31 AM
I have played about in Solidworks a bit, and it really does need to be a proper helical shape, otherwise the two will not mate together back to back.

I looked at taking step cuts, but it is going to end up looking like a spiral staircase and probably still need finishing with a file anyway, so I had come to the conclusion that it will have to be set up for spiral milling, I did wonder about using some sort of sheet metal ramp/cam and just hand feeding them a bit like some of the spiral gear attachments we have seen.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on June 04, 2016, 08:08:51 AM
I suppose if the steps were small enough maybe 1 or 2 degrees you could get a fairly good finish.

As you say the flat ramp does not quite mate on the ramp but the faces that take the load do.

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on June 04, 2016, 08:29:48 AM
Jo whats the best way to generate the helix when using the slotter or shaper?

You do it the same way you do for a milling machine. The only difference is you are using an up and down tool rather than a round and round one which means you get square edges right into the corner and if you shape the tool correctly the ramp should also be smooth.

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on July 17, 2016, 11:34:14 PM
Just a quick update on progress, I am busy making the barring engine at the moment.

This is the full size one, so you can see it is tiny in comparison to the flywheel it has to turn.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/Agnes%20At%20Washpit%20Mill/Agnes%20098_zpsyxq5hyxm.jpg)

The model starts off by making the worm and wheel, the worm is a bit complicated in that it is also the crankshaft and eccentric.
All this was machined from solid.

Blank for worm wheel being formed on the Alexander milling machine using a Tom Senior dividing head.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2017-04-16_zpsobgzsu4f.jpg)

Teeth on the wheel were cut on Mikron hobbing machine, it was a real fluke that I had the correct cutter for this.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20005%2017-04-16_zpssqkta9bf.jpg)

Transfered to the boley & Leinen jig borer in order to produce the cruciform section spokes.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20006%2019-04-16_zpsinkw0zaz.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20008%2019-04-16_zpsjbd2xj4h.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20011%2019-04-16_zpsg2kirxzx.jpg)

Here is the embryo crankshaft having the mating worm put on.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2001-05-16_zpsxiw37uie.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20003%2001-05-16_zpsmo138m25.jpg)

I made this fixture for turning the crank and eccentric pins, but it was a failure I am afraid, being made from aluminium it was just not rigid enough.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2002-05-16_zpsc9ne4fos.jpg)

So I modified my Keat's angle plate to do th job and that worked much better.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2028-05-16_zpsjjsyfzuw.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20003%2028-05-16_zpslmlrfqjt.jpg)

You get a sense of the scale of the finished shaft next to a ruler.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20002%2029-05-16_zpsgqj7s2od.jpg)

More to follow.
Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Gas_mantle on July 17, 2016, 11:44:53 PM
Looking good Phil, nice work :-)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: fumopuc on July 18, 2016, 05:52:05 AM
Hi Phil, fantastic. Thanks for showing your progress.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Ramon on July 18, 2016, 10:04:40 AM
Lovely work Phil -particularly those cut outs - very nice milling all round  :ThumbsUp: :ThumbsUp:

Regards - Ramon
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: jadge on July 18, 2016, 10:07:47 AM
Great looking worm and worm wheel. Presumably there is no need to gash the worm wheel first when using a hobber? Assuming that the worm wheel is based on an integer value DP how did you set up the lathe to cut the irrational pitch worm?

Andrew
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on July 18, 2016, 12:48:44 PM
Andrew

The worm and wheel are 0.1" circular pitch, so the worm was a straight forward 10 TPI thread with the correct ACME profile to match the worm.
All I had to do was work out the diameter of the wheel blank and put the root radius onto its OD with a ball nose slot drill prior to hobbing the teeth.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: jadge on July 18, 2016, 10:04:34 PM
Phil: Thanks for the information. I guess it makes sense to do it that way round so you don't end up with an irrational pitch for the worm. It's a very impressive looking worm wheel.

Andrew
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on July 18, 2016, 11:51:13 PM
Next up is the base casting, mostly just straight forward squaring up and milling pockets etc, there are quite a few 10BA tapped holes that needed a bit of care as well.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2030-04-16_zpszuaavimb.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20004%2030-04-16_zpsaaivpbii.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2004-06-16_zpsp0eyhepx.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20004%2004-06-16_zpsvehw1cnz.jpg)

Then onto the split bearings, these were made from a piece of recycled cast brass musical box bedplate that is about 150 years old.
I faced up a couple of blocks and soft soldered them together whilst they were being machined.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2020-06-16_zpswkdcaxpa.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20002%2020-06-16_zpsvueccwxt.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20002%2003-07-16_zpsfhiu1amy.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2003-07-16_zpstezzwukn.jpg)

The outrigger bearing was next, but I got carried away and forgot to take any pictures until it was done apart from this first one just skimming up a datum face to work from.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20003%2010-07-16_zpssqsq5joe.jpg)

So, that's where I am up to at the moment. Here is a trial assembly of what I have done so far.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20002%2017-07-16_zpsj02hwjyc.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2017-07-16_zpsbe8hpwuq.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20005%2017-07-16_zpsqis78lks.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Dave Otto on July 19, 2016, 01:02:14 AM
Nice work and progress Phil!

It is always fun to see an update on this amazing engine and project.

Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: 10KPete on July 19, 2016, 03:19:11 AM
A first glance at those pics and one thinks "Wow, that's a nice engine." Then one comes to the pic with it on the
tapping pillar.....

That engine is tiny!!

Beautiful work.

Pete
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on July 19, 2016, 07:37:03 AM
Looking good Phil, would make a nice little project in itself.

Are you going to add some rod to the counterbored holes to bring them up to look like cast bosses?

J

PS PM waiting for you on the other side ;)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on July 19, 2016, 08:04:22 AM
Yes that's the plan.
The visible holding down studs and nuts will actually be dummies on the model, the whole engine is bolted to another sub base from below where you cannot see it.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Steamer5 on July 19, 2016, 08:45:54 AM
Hi Phil,
 That is a little beauty! Like Pete said, it's a lot smaller than first thought.

Cheers Kerrin
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: yogi on July 24, 2016, 02:58:41 PM
Fantastic work Phil!  :ThumbsUp: :ThumbsUp: :ThumbsUp:
Thanks for the update.  :cheers:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on August 14, 2016, 11:21:40 PM
My neighbour is a cabinet maker, this morning he delivered me some wood for making the floor boards for my engine base, it is a bit of nice walnut that he has kindly cut and planed into suitable scale size planks for me.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Workshop%20001%2014-08-16_zpsodfch7wp.jpg)

I also finished the flywheel for the barring engine.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2024-07-16_zps9ihpus9c.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20002%2024-07-16_zpscbsud5u8.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20003%2031-07-16_zpsu3vk4spg.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20004%2031-07-16_zpsvsykciom.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on August 14, 2016, 11:40:18 PM
Do you remember me asking for advice on how to make these helical shaped parts.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/Agnes%20At%20Washpit%20Mill/22-023_zpsrwlrpecx.jpg)

Well I figured it out. Having a toolmakers milling machine allowed me to set up a gear train to my universal dividing head, and then produce the helix using the slotting head.
The feed was manually applied by turning the handle on the dividing head, at this point the dividing plate turns with the handle and the gearing train. the indexing for each of the three helixes was done using the dividing plate in the normal manner in between each cut. The photo's will show what I mean.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20012%2014-08-16_zpsbei9pdf7.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20010%2014-08-16_zpsoc6gpywy.jpg)

Here are the two blanks turned to shape using Phosphor Bronze material.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20004%2014-08-16_zpsy7sp818d.jpg)

And shown in the collet of the dividing head ready to start cutting.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20006%2014-08-16_zpskm2eds3s.jpg)

First cut finished.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20008%2014-08-16_zps7a8oa7ki.jpg)

First part finished with all three cuts.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20009%2014-08-16_zpsgsk1onss.jpg)

Both parts machined but will they mesh together ?

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20014%2014-08-16_zps5wxfjkua.jpg)

YES  ;D

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20013%2014-08-16_zpshotzcmbr.jpg)

Here they are in position on the barring engine. I just need to finally attach the gear onto the sliding one.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20016%2014-08-16_zpslwl7cwgr.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: 10KPete on August 14, 2016, 11:55:46 PM
That is soooo cool! Keep it coming, this is great!

Pete
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Ramon on August 14, 2016, 11:57:43 PM
Lovely work as usual Phil and a superb result.  :ThumbsUp:

As one of my old bosses would say with a job well done - "Excellen-tay"

Regards - Ramon

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on September 20, 2016, 11:28:56 PM
Next part to be made is the cylinder and its column, this is the full size one.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/Agnes%20At%20Washpit%20Mill/Agnes%20098_zpsyxq5hyxm.jpg)

I had a gunmetal casting for this but it turned to be unsuitable for various reasons so I elected to fabricate it from two machined parts. My initial thoughts were to use gunmetal or phosphor bronze and then silver solder them together.
However in reality this engine is intended to be run on compressed air and will probably never need to run on steam, so I have decided to make the parts from cast iron and bond them together with loctite 601 instead, this has the advantage that areas of bare metal will be the correct colour as per the prototype.

Most of the operations are fairly straight forward turning and milling and the photo's should be fairly self explanatory.
The basic shape of the column was turned and bored for the crosshead.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20001%2012-09-16_zpsrlecywzv.jpg)

A mandrel was then made and loctited into this bore so the part could be reversed and held in a collet for machining the cylinder bore and sleeve diameter for the steam chest to fit over.
This mandrel was also used to hold the part on the jig borer for milling the 1mm wide slots for the valve ports to transmit steam/air to either end of the cylinder.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20003%2014-09-16_zpsminbdegb.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20004%2014-09-16_zpsv68vex6q.jpg)

The four mounting holes were added using the PCD function on the jig borer DRO, I had to make an extended centre drill to reach the flange.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20006%2015-09-16_zpswle818tn.jpg)

For reasons which will become apparent I had other things on my mind and completely forgot to take photo's at this stage, so you will have to use a bit of imagination.

Moving onto the bigger milling machine I mounted the part in the dividing head to remove the material from either side of the column. I had designed this with an angle of 50 either side of the centreline, so I had to work out how many turns and holes were needed to achieve this.
I counted 80 teeth on the wormwheel, so ended up with the calculation (50/360) x 80 = 11.11 turns of the dividing head handle, which equals 11 turns and 2 holes on the 18 hole circle.

Being cautious and not wanting to scrap this part I decided to test my maths and see if it looked right in practice prior to cutting any metal. A good job I did because it moved way too far, in fact it seemed to go twice as far as it should  :help:
I checked my maths again and got the same result which was very puzzling, it was a little while before the penny dropped and I discovered the dividing head has a two start worm and is in fact 40:1 ration and not the 80 that I had counted earlier  :Doh:

So back to the maths and we now have (50/360) x 40 = 5.5555, or 5 turns and 10 holes on the 18 hole circle. Back to the machine to test the maths again and all is now OK. At this point the day is over and I went indoors  :DrinkPint:

So the following day I resume work and start making cuts, the first cut went perfectly, so I indexed to the next position and proceeded with the cut, something did not look just right and I started to doubt that I had counted correctly with the dividing.
The third cut seemed to go a lot better, but the last cut was an absolute disaster, there was a massive gouge where too much meat had been removed. It was now clear that this part was going in the scrap bin  :'(

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20015%2018-09-16_zpso1a11uth.jpg)

You are probably wondering why this happened as I was. Well it was a case of me thinking I must have tightened the dividing head collet the night before, but not actually doing it.
So the part was only finger tight and was revolving in the collet and being pulled into the cutter........What an idiot  :hammerbash:

The only option now was to start all over again and make another one but remembering to tighten the collet this time.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20016%2018-09-16_zpsdw7deemv.jpg)

The last operation I did was to drill and tap the 10BA holes for the piston rod gland.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20008%2018-09-16_zpsqaeci7hb.jpg)

And here it is in position on the engine, all it needs now are the webs up each side making and fitting.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20010%2018-09-16_zpsi9otygfm.jpg)

The steam chest part of this assembly will follow in due course.

Phil

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Dave Otto on September 20, 2016, 11:45:08 PM
Bummer on the column Phil  :wallbang:
The second one sure turned out nice!


Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on September 21, 2016, 07:13:15 AM
Made it in the end  :)

Does this mean that you are back working on Agnes for the fall  8)

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on September 21, 2016, 07:39:47 AM
Must be those magazine articles that have got him inspired ;)

I had not thought about cutting the passages into the outside of the cylinder, have done it on the concave inner face of the part that forms the valve face before and both are easier than drilling angled holes.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on September 21, 2016, 08:25:07 AM
Jo

I have never not been working on Agnes, this is my normal speed throughout the whole year.

Jason

I came up with this method of porting during my model compound traction engine build many years ago, you have to be quite inventive at using special liners etc when starting from a solid casting.

One thing you might be able to help me with though.
I seem to remember seeing a good method of machining piston and valve rod glands, but cannot remember where it is.
I am undecided whether to use my normal shape of four radii and four flats joining them, or to go for four blended radii, I am leaning towards the latter at the moment.

Did I see a table of gland proportions somewhere on here ? and perhaps a fixture for turning the large radii ?

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Gas_mantle on September 21, 2016, 06:46:33 PM
Looking great Phil, it's a complex build just making the barring engine let alone the main engine.

You going to make another smaller engine to bar the barring engine into position ?   ;) ;)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on September 21, 2016, 08:17:31 PM
The boring head does a reasonable job, a jig in the 4-jaw (as sketch) produces similar results for the more rounded ones.

Prepare your gland
(http://img.photobucket.com/albums/v156/jasonballamy/Engineering/Muncaster/DSC01241_zpsqrwd4rhl.jpg)

Mount on your valve chest if you need to produce a matching spigot on that and with head set for external turning reduce to the major axis
(http://img.photobucket.com/albums/v156/jasonballamy/Engineering/Muncaster/DSC01242_zpshwfrphwf.jpg)

Adjust head to your large radius and cut one side
(http://img.photobucket.com/albums/v156/jasonballamy/Engineering/Muncaster/DSC01243_zpsgqs86ig1.jpg)

Then the other
(http://img.photobucket.com/albums/v156/jasonballamy/Engineering/Muncaster/DSC01245_zpszaozbh4h.jpg)

File the ends with teh aid of buttons and jobs done
(http://img.photobucket.com/albums/v156/jasonballamy/Engineering/Muncaster/DSC01246_zpsh4uznyv1.jpg)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: crueby on September 21, 2016, 08:43:55 PM
Jason, great tutorial on milling the curved sides of the gland! Another one for the file...
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on September 22, 2016, 08:13:02 AM
Cheers Jason, just what I was looking for.

I do like the idea of machining both parts in one go like that.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on September 29, 2016, 11:10:36 PM
Some more slight progress in the last few days.

The cylinder sleeve has emerged from a lump of cast iron.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20002%2025-09-16_zpschh9fozq.jpg)

I like mounting parts on mandrels using Loctite 601

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20003%2025-09-16_zps9uklcbvs.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20004%2025-09-16_zpsxyrovarb.jpg)

The column has now gained some side webs, and tested for a trial fit with the cylinder sleeve.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20005%2028-09-16_zpsi200np7b.jpg)

Here is the embryo cylinder end cover being spot drilled for the stud holes using the DRO's PCD function.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20008%2028-09-16_zpsprutsgps.jpg)

The steam chest and its cover also came from a spare chunk of cast iron, here being sliced up with a solid carbide saw.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20006%2028-09-16_zpsmxfd6waw.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20007%2028-09-16_zpsqs5ramtg.jpg)

After finishing to size it too was spot drilled for the stud holes, in this case they are 12BA.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20009%2029-09-16_zpst7sso0qc.jpg)

Then the outer face was pocketed out 0.010" deep.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20010%2029-09-16_zpsyohx8ykj.jpg)

The faces were then polished on very fine emery to remove all machining marks, and the pocket was roughed up a bit with a Burgess engraving tool.
The photo has not really shown it at its best on this one.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Barring%20Engine%20011%2029-09-16_zps2qg300ax.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on October 21, 2016, 10:18:29 PM
OK, a few more bits to cross off the list.

Steam chest.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20001%2001-10-16_zps4qbpdun0.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20002%2001-10-16_zpscztadrhv.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20003%2001-10-16_zps3hs7cbvx.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20004%2001-10-16_zps4ryui8yq.jpg)

And its valve rod gland made using the method suggested by Jason. To give an idea of scale those threads are 1.2mm diameter.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20003%2002-10-16_zpswue1tupt.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20006%2002-10-16_zpstcisrfnn.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20008%2002-10-16_zpsceij6syj.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20001%2013-10-16_zps0mmatpod.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20002%2003-10-16_zps8q0il62p.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on October 23, 2016, 03:59:36 PM
Next was a session of stud making on my Pultra 1770, I had to spend a while setting up all the capstan tooling but it works a treat.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20001%2009-10-16_zpsga1uvzja.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20002%2009-10-16_zpsfh9vime9.jpg)

The blued steel cladding will be held onto the cylinder using M1.2 screws, as I did not fancy breaking a tap in the cylinder at this point I made some threaded brass inserts to press in instead, these are only 2mm diameter and were made on the little Boley watchmakers lathe.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20002%2010-10-16_zpsw0bvxwuf.jpg)

The piston rod gland was made using the same method as the valve rod gland.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20001%2016-10-16_zpssbyhyrkq.jpg)

Then the crosshead was made using a bit of gunmetal. This part is only 5/16" diameter.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20001%2019-10-16_zpsbgxbhikb.jpg)

Here it is on a makeshift 3/32" mandrel having the last cuts on the outer faces.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20001%2021-10-16_zpsvqr9hp6x.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20007%2021-10-16_zpso6kuoxpo.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20006%2021-10-16_zpsfp0bs5rf.jpg)

And the cylinder assembly so far.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20008%2021-10-16_zps7sovq6c0.jpg)

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Agnes%20009%2021-10-16_zpsts2ytrl9.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jasonb on October 23, 2016, 04:13:24 PM
Comming together nicely Phil, good to see the gland making method worked OK for you.

J
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Roger B on October 31, 2016, 01:17:34 PM
Very nice work  :praise2: I like the small turret lathe for stud making  :ThumbsUp:  :ThumbsUp:  :wine1:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Rivergypsy on November 01, 2016, 12:05:59 PM
Nice work!

By the way, how do you plan to blue the cladding for this - rust or chemical? I only ask as i'm reading up on bluing the cladding for my compound.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on November 01, 2016, 01:06:23 PM
Re the bluing of the cladding.

I have not 100% decided yet, but a friend has recently blued some parts for a regulator clock using bluing salts which are heated until they melt and then dipping the parts in.
Unless someone has a better suggestion I think I will try that method on the cladding. The one on the barring engine is tiny, but there is also quite a bit of complicated cladding on the main engine cylinders.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on November 05, 2016, 03:58:42 PM
Connecting rod next I think.

The main problem when parts get so small is how to hold them without causing any damage, I like to machine as much as possible whilst the component is still part of the raw material.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Workshop%20001%2028-10-16_zpspz7rpvbh.jpg)

Here the sides are being machined using a back stop to prevent any flexing.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Workshop%20003%2028-10-16_zpsi5onoceh.jpg)


(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Workshop%20004%2028-10-16_zpsioytooot.jpg)


Then once it has been parted off, the 1.2mm diameter bolt holes can be added by holding it in a watchmakers vice.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Workshop%20006%2028-10-16_zpswmsrzydz.jpg)

This gives an indication of just how small it is, there is even a bronze bush for the 3/32" little end pin.

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Workshop%20008%2028-10-16_zpsfj0xfucx.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Rivergypsy on November 07, 2016, 12:20:47 PM
Very nice - well done!

Good luck on the bluing too, and thanks for the info.

Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on November 26, 2016, 11:33:18 PM
I don't want to sound too smug (well maybe just a little bit)  :-[

My little barring engine did better than I could have expected at the Bradford Model engineering exhibition today, I got one trophy for best "unfinished model", and another for best "general engineering" exhibit.

The entries are all voted for by the other members and not by judges. It makes it all worthwhile when your work is appreciated by others.

I didn't realise that I had accidentally moved the mode dial on my camera, and it has put star bursts on it for me as well.  :ThumbsUp:

Phil

(http://i456.photobucket.com/albums/qq286/pgp001/Model%20Engineering/Pollit%20and%20Wigzell%20Mill%20Engine%20%20Agnes/My%20Model%20of%20Agnes/Barring%20Engine/Bradford%20Exhibition%20038%2026-11-16_zpszje7hwx9.jpg)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Gas_mantle on November 26, 2016, 11:42:17 PM
Congrats Phil, a well deserved award for a couple of fine exhibits  :)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: crueby on November 26, 2016, 11:43:21 PM
Nice!
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Dave Otto on November 27, 2016, 01:01:39 AM
Congrats Phil, that's beautiful!
Very nice work.


Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: b.lindsey on November 27, 2016, 01:15:43 AM
Beautiful Phil, and well deserved recognition too.

Bill
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: fumopuc on November 27, 2016, 08:13:06 AM
Hi Phil, congratulations. That flywheel is magnificent.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: kvom on November 27, 2016, 02:15:12 PM
I just spent the morning reading this thread from the beginning.  Truly inspirational.   :ThumbsUp:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: larry.doucet.37 on November 29, 2016, 04:15:12 PM
Where can I get castings I'm new on this site from Nova Scotia Canada


Sent from my iPad using Tapatalk
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on November 29, 2016, 04:34:37 PM
 :lolb: You will have to read this thread from the beginning.

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on April 17, 2017, 07:36:05 PM
Just a quick update, I managed to make the last few parts for the barring engine over Easter and curiosity got the better of me and I had to hook it up to the garage compressor to see what happened.
This was just a quick lash up with no regulator or control valve, but I was very pleased that it ran first time with no valve adjustments needed, I will fine tune it on final assembly but at least I can say something is nearly finished for a change.

Excuse the hurried video, I was running out of time.
b45DiupolxM
Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: crueby on April 17, 2017, 08:09:52 PM
Nice!
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: vcutajar on April 17, 2017, 10:07:28 PM
Nice one Phil.

Vince
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Gas_mantle on April 17, 2017, 11:58:34 PM
Great job Phil, looks and sounds the part  :)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Alan Haisley on April 18, 2017, 03:12:38 PM
Very nice.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Rivergypsy on April 20, 2017, 12:32:00 PM
Loving this build - well done! :ThumbsUp:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on August 12, 2017, 06:12:07 PM
(http://lister-engine.com/coppermine/albums/userpics/10026/normal_Agnes.JPG)

I bet you all thought I had made some progress on Agnes and was posting up loads of new photo's.
Sorry to disappoint you, but all I am doing is testing out the Coppermine photo hosting site to see how it works before I too eventually get kicked out of Photobucket.

Actually I will very shortly have some new photo's to share, as I have almost finished the process of fitting hundreds (well it seemed like it) of Walnut floorboards to the engine base board.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on December 06, 2017, 08:43:41 PM
Floor boards as promised. They are 3mm thick x 16mm wide solid Walnut all individually cut to size and stuck on with Gorilla glue and finished off with a few coats of Danish oil.

The two trophies were for the little Barring Engine at the Bradford MES annual exhibition last year.

(http://lister-engine.com/coppermine/albums/userpics/10026/Agnes_Trophies_001_11-11-17.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: tvoght on December 06, 2017, 09:28:17 PM
Good heavens, if those cups are for the barring engine, the ones you get for the finished engine could be used as municipal water towers!

Spectacular work,

--Tim
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Admiral_dk on December 06, 2017, 10:23:04 PM
Quote
Good heavens, if those cups are for the barring engine, the ones you get for the finished engine could be used as municipal water towers!

Spectacular work,

 :lolb:

Seriously though - it's a big engine and good looking so far  :ThumbsUp:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Gas_mantle on December 06, 2017, 11:08:11 PM
Looking great Phil, when are we going to steam it up  ;)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: b.lindsey on December 07, 2017, 01:36:16 AM
The floor work looks great Phil. The engine ain't half bad either !!

Bill
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: vcutajar on December 07, 2017, 06:32:37 AM
Congratulations Phil.  Well deserved.

Vince
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Zephyrin on December 07, 2017, 08:38:27 AM
I spent great moment reading this thread from the first post, thanks to share, and congratulations !
Nice workshop and tooling too, and first class skills to master each step.
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Ramon on December 07, 2017, 08:55:25 AM
That's coming along really well Phil. The boards add a real dimension and look superb . Congrats on the win - that cup looks like it's seen a few recipients over the years.

Ramon
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on December 07, 2017, 01:13:31 PM
Hi Ramon

The smaller cup was for best model in the "general engineering" class.

That big cup is for best "unfinished model", I have won it twice now but you are not allowed to win it on consecutive years.
The worry is that at my speed of output I could possibly be in danger of winning it a few more times before this one is finished  :old:

I have had a few traumatic events to deal with lately, so I am afraid workshop activities have been even less than my usual slow pace.  :(
Maybe when I retire in 4 years time things will get done quicker, I am not betting on it though.

Phil

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on February 25, 2018, 06:47:05 PM
Just in case anyone is wondering why they haven't seen any updates on Agnes recently. It's because I have been otherwise occupied with my new toy.

AKA Desmond the Morris.

(http://lister-engine.com/coppermine/albums/userpics/10026/normal_9736620.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: crueby on February 25, 2018, 08:28:31 PM
Just in case anyone is wondering why they haven't seen any updates on Agnes recently. It's because I have been otherwise occupied with my new toy.

AKA Desmond the Morris.

(http://lister-engine.com/coppermine/albums/userpics/10026/normal_9736620.jpg)

Phil
Great looking car! Great condition. What year is it?

Though, I thought Desmond was a tutu, not a car....  :thinking:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on February 25, 2018, 10:32:20 PM
Desmond was born in 1969 and has been fully restored including a new Ash wood frame.
He also has a few upgrades including servo disc brakes, telescopic shock absorbers and an alternator etc.

My wife is an animal lover and wanted to call him Johnny, after Johnny Morris who used to be a TV presenter.  :o
https://en.wikipedia.org/wiki/Johnny_Morris

I could not bring myself to call him Johnny, so accepted Desmond as second choice.  :-\
https://en.wikipedia.org/wiki/Desmond_Morris

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Ramon on February 25, 2018, 10:45:48 PM
Ah Phil - so you've got yourself a 'half timbered car'  :D

That's not my phrase but one 'Edna Everidge' to her long suffering friend Madge  - "Oh look Madge there's a half timbered car - isn't that quaint ? "

I once had a bright green Austin A55 Cambridge - 'Sean the Leprecaun'. Last car was 'Zipper' this ones 'Ziggy'.

Time you paid that girl Agnes some attention though ;)

Regards - Tug
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Gas_mantle on February 26, 2018, 05:35:55 AM
Very nice Phil  :)

Are you going to take up pipe smoking and wearing driving gloves for the authentic look  ;)
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: cjuk on April 23, 2018, 12:05:40 PM
Looks great!! As a descendant of the pollits, my great grandfather was John Pollit, its great to see people building models of the surviving engines :)

Chris
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: gary.a.ayres on September 11, 2018, 07:35:10 AM
Just read Page 1 and I'm hooked. Those castings!  :Love:

Can't wait to see the pics of that Alexander mill in action!

This one's for reading start to finish...

gary
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on September 11, 2018, 08:00:46 AM
Hi Gary

Glad you like it, I have not got much done this summer for various reasons but should hopefully get going again soon. Do you have an Alexander mill ?

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: gary.a.ayres on September 13, 2018, 09:10:36 PM
Phil -

just finished reading your whole thread. Absolutely stunning work and a neophyte such as myself can only look on in wonder....

Great read too...

We each have our own rhythm and I am impressed by how unflustered you seem by any impulse to rush things!

I don't have an Alexander, unfortunately, or anything close. If I did I'd be on a steep learning curve about how to gear a dividing head to the table, and so on.

Shortage of machines isn't my problem; rather it's lack of experience, and to quote the signature of another member: 'ars longa, vita brevis'.

However... to keep learning and enjoying is the main thing for all of us.

 :)

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on September 17, 2018, 10:42:23 AM
It's probably about time I posted some more photo's. The only progress has been on the eccentric straps.

These were drawn up in Solidworks as usual, and started life as rough gunmetal castings. There are three eccentrics on this engine two the same for the inlet valves and one a bit thicker for the exhaust valves.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_001_26-12-17~0.jpg)

The outsides were cleaned up using a dremel.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_002_26-12-17.jpg)

Followed by a roughing cut to get a square datum to work from.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_003_26-12-17.jpg)

Then flipped over to do the other side.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_005_26-12-17.jpg)

Then the mating surfaces were machined square to the sides.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_004_26-12-17.jpg)

Spot drilling for the bolt holes.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_008_28-12-17.jpg)

Followed by the drill.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_009_28-12-17.jpg)

Bolted together and roughing out the bores. These will be finished to size held flat on the faceplate later so there is no distortion from holding in the chuck jaws.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_010_29-12-17.jpg)

On the first mandrel for facing to final thickness.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_011_29-12-17.jpg)

All three were brought to this stage.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_012_29-12-17.jpg)

Setting them to run true using a roller bearing in the toolpost.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_013_30-12-17.jpg)

At this point they were bored out to final size, but I was on a roll and forgot to take a photo.
So I then made an expanding mandrel to hold them for boring the stepped recess in either side.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_016_01-01-18.jpg)

The lubrication bushes were then silver soldered in prior to bead blasting.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_017_20-01-18.jpg)

A pair of filing buttons were made from silver steel and hardened, these are to finish the radius around the bolts.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_018_20-01-18.jpg)

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_019_20-01-18.jpg)

And this is how they look today.

(http://lister-engine.com/coppermine/albums/userpics/10026/Eccentrics_020_20-01-18.jpg)

You will probably be thinking I have been busy on the engine lately, but the truth is I did what you see here last January and for various reasons have not touched it since.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on July 23, 2019, 11:49:45 PM
Just managed to finish the eccentrics to go with the straps, here are a few photo's (I keep forgetting to stop and take photo's so they are a bit random)

Having cut the outer groove to be a good running fit in the straps, the blanks were parted off to width and then drilled and finally bored to size with a single point tool, I did not have a 13/16" reamer.

(http://lister-engine.com/coppermine/albums/userpics/10026/Workshop_001_07-07-19.jpg)

I then made a fixture that could be slid along the tee slots of the rotary table to give me the offset for machining the cutaways.

(http://lister-engine.com/coppermine/albums/userpics/10026/Workshop_001_09-07-19.jpg)

The following photo's show it in use.

(http://lister-engine.com/coppermine/albums/userpics/10026/Workshop_003_09-07-19.jpg)

(http://lister-engine.com/coppermine/albums/userpics/10026/Workshop_005_09-07-19.jpg)

(http://lister-engine.com/coppermine/albums/userpics/10026/Workshop_006_09-07-19.jpg)

The same fixture was then used to add the holes for the fixing bolts.

(http://lister-engine.com/coppermine/albums/userpics/10026/Workshop_002_11-07-19.jpg)

Here they are almost finished.

(http://lister-engine.com/coppermine/albums/userpics/10026/Workshop_002_14-07-19.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Dave Otto on July 24, 2019, 01:00:50 AM
Nice detail, good to see some progress in this interesting engine.

Dave
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: crueby on July 24, 2019, 01:29:19 AM
Great parts! And I love the idea for the sliding fixture on the rotary table, gotta make something like that...!
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Kim on July 24, 2019, 06:05:15 AM
Those eccentrics are really nice looking!  Like Dave said, nice detail!
The sliding fixture is a pretty cool idea too.
Kim
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Jo on July 24, 2019, 07:19:34 AM
Nice to see some progress Phil  :)

Did you position the grub screws where you have so that you can use headed bolts while you set up the timing?

Jo
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on July 24, 2019, 08:17:34 AM
Grub Screws...........Who mentioned Grub Screws ? .........Not on my engine thankyou.  ;D

Those eccentrics are actually held in place with two hexagon head bolts at 90 to each other, as per full size. The only difference on the model will be the screws will eventually have dimples drilled into the crankshaft once the timing has been established, the full size engine had some gripper pads between the ends of the bolts and the shaft. The bolts are going to be very fiddly to fit and then adjust the timing, so it could get interesting.
Seriously though I may use some grub screws initially until the timing is set, then swap them for the correct bolts later, It is one of my pet hates being able see modern fasteners on something like this, I dont mind if they can be hidden, but certainly not on show.

That fixture was actually a Graham Meek idea, he documented it when explaining how to mill the base and nose radii on small engine cams, so I just modified it a bit to do these eccentrics.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: mike mott on July 24, 2019, 03:18:00 PM
I really like the look of those eccentrics.

Mike
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on October 12, 2020, 11:49:04 PM
This is the current state of play, I now have an "almost" finished Whitehead governor on the engine.

(https://listerengine.com/coppermine/albums/userpics/10026/Workshop_010_11-10-20.jpg)

(https://listerengine.com/coppermine/albums/userpics/10026/Workshop_004_11-10-20.jpg)

(https://listerengine.com/coppermine/albums/userpics/10026/Workshop_002_11-10-20.jpg)

Phil

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Admiral_dk on October 13, 2020, 12:40:10 PM
I've completely forgot how big a project this one is  :o  - oh and nice parts  :ThumbsUp:

I can't remember - is the barring engine functional ?

Per
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on October 13, 2020, 12:50:00 PM
Yes definitely a long term project.

And yes the barring engine has run on compressed air.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: box853 on January 26, 2021, 11:22:02 AM
Hi - This is all of very great interest to me!! I come from New Mill - just outside Holmfirth - and from about 14-17 used to cycle to Washpit Mills in school holidays when Herbert White used to let me help in looking after Agnes. I gradually progressed to him letting me start it up for the morning shift, and shutting down in the afternoon, although for obvious reasons he thought it best I didn't slam in the plug thing for synchronising the generator (Mather and Platt) to the mains. I think what you're doing is absolutely wonderful - at the time I was seeing Agnes (my hot and steamy girlfriend!!!) I was also making a Stuart Turner No. 9 model engine in my spare time at Honley high School so seeing your work is totally brilliant!!! The engine still works! - eeMGf5yBatU and zhcoQbZp1ys
I now make accordions (www.briggsaccordions.com) and have my own charity where we use specialist technology to enable people with disabilitites to make and play music (www.omnimusic.org.uk). I'm over in Manchester and would love to visit some time if at all possible when the Covid thing has passed!

Anyway, now I've found this page of yours I'll be following the progress of your work with great interest! Totally brilliant!!!!!

doug

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on January 26, 2021, 05:41:20 PM
Hi Doug

Nice to hear from someone who has actually seen Agnes in her original location, my late father used to go see Herbert White and Agnes back in the 80's and I have the photo's my mum took to prove it.
I did get to start Agnes myself a few years ago when I went on one of my fact finding trips to Markham Grange steam museum where she now lives. They have been very helpful and allowed me over the fence to take measurements and photo's etc.

This is a long term project and I seem to go in fits and starts as and when I am in the mood, I flatly refuse to make any parts unless I am in the zone, if I do force myself I end up not making things to a high enough standard.
I have not put any updates on here for quite some time, the problem is it takes ages to do photo's as well as make the parts, and then all the editing and writing up of each stage is very time consuming.
So what I have decided is to crack on with cutting metal and take a few photo's when I remember, then as each sub assembly is done put a selection on here.

I have just spent at least ten hours hogging cast iron chips from the upper and lower steam chambers in both cylinders, I am just about to cut the actual steam ports in them when I pluck up the courage to try the 0.048" slitting saw. I will be glad to get that stage behind me.

You are welcome to come and see my Agnes once travel is allowed again.

Your accordions look fantastic by the way.

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on March 30, 2021, 08:09:23 PM
I have been doing a bit more on Agnes.

The casting for the condenser was always going to be a problem, Peter Southworth must have mis-calculated the height of it when he made the pattern and it is 3/8" too tall.
So I decided the only way to deal with it was to cut the bottom off it and make a new one to fasten in.

This is the setup for machining the base off it.
(https://lister-engine.com/coppermine/albums/userpics/10026/Workshop_002_21-11-20.jpg)

The pipe flange was cleaned up at the same time, although I later removed that completely and fitted a new one as there was not enough room for any nuts and bolts.
(https://lister-engine.com/coppermine/albums/userpics/10026/Workshop_003_23-11-20.jpg)

This shows the setup to take a measurement for the new base height.
(https://lister-engine.com/coppermine/albums/userpics/10026/Workshop_003_24-11-20.jpg)

A chunk of cast iron was machined up to be a good fit inside the condenser casting
(https://lister-engine.com/coppermine/albums/userpics/10026/Workshop_001_27-11-20.jpg)

(https://lister-engine.com/coppermine/albums/userpics/10026/Workshop_002_29-11-20.jpg)

It was held in place with four contersunk screws in the end walls, followed by a bit of my favourite 3M putty to simulate some casting fillets.
I dont think it turned out too bad.

(https://lister-engine.com/coppermine/albums/userpics/10026/Workshop_003_13-12-20.jpg)

Phil

Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: scc on March 30, 2021, 09:06:35 PM
Hi Phil,     Lovely to see Agnes progress again :ThumbsUp:   I suppose modifying castings is almost as much fun as making from barstock ;)
Terry
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: pgp001 on July 09, 2021, 09:55:50 PM
Sorry I have not been updating this lately, I have done a fair bit of work on the cylinders though.

The problem is I keep getting distracted, this is the latest one.

(https://lister-engine.com/coppermine/albums/userpics/10026/Triumph_Collection_004_09-07-21_28229.jpg)

(https://lister-engine.com/coppermine/albums/userpics/10026/Triumph_Collection_001_09-07-21_28229.jpg)

Phil
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Admiral_dk on July 10, 2021, 07:08:30 PM
Congratulations with your new ride  :ThumbsUp:
Title: Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
Post by: Mike Sanders on November 21, 2021, 09:16:56 PM
Nice bike. Any progress on the engine?