Author Topic: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.  (Read 59614 times)

Offline Ramon Wilson

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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
"I ain't here for the long time but I am here for a good time"
(a very apt phrase - thanks to a well meaning MEM friend)

Offline Johnb

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Lovely!
John Browning. Member of Ickenham and District SME

Offline zeeprogrammer

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Nice birthday gift I'd say. Awesome.  :ThumbsUp:
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline b.lindsey

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Amazing work!! Well worth waiting for ....Happy Birthday too.

Bill
« Last Edit: April 09, 2016, 01:27:13 AM by b.lindsey »

Offline gbritnell

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What a fantastic piece of work on the flywheel! The details are outstanding.
gbritnell
Talent unshared is talent wasted.

Offline kvom

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Great work, and very well documented too.   :ThumbsUp:

Offline fumopuc

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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.
Kind Regards
Achim

Offline Alan Haisley

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I really love the picture of the last index point. It's so nice when two ends of a gear come together.  :ThumbsUp:

Alan

Offline pgp001

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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.







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.

Offline crueby

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Wow - that is looking fantastic!

Offline Roger B

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Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
« Reply #100 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:
Best regards

Roger

Offline sco

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Re: Agnes.... 1/16 Scale Pollit & Wigzell Tandem Compound Condensing Engine.
« Reply #101 on: April 09, 2016, 08:20:13 PM »
Wow - that is looking fantastic!

I second that, love the flywheel in particular!

Simon.
Ars longa, vita brevis.

Offline pgp001

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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.



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

Offline Jasonb

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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



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





« Last Edit: June 04, 2016, 07:42:53 AM by Jasonb »

Offline Jo

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Looks like a job for Tgs slotting head  ::) or a shaper

Jo
Enjoyment is more important than achievement.