Model Engine Maker
Engines => Restoration of Model Engines => Topic started by: Stilldrillin on July 23, 2012, 10:43:14 AM
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This rebuild is not finished, yet. Though, I started it almost a month ago.
I thought I'd post the first instalments here, until I catch up.
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Maiwald Hot Air Engine, rebuild.........
Well, here's the start of another of my rebuilds! :)
Yet another frail orphan, from my toy cupboard.
This is a James Maiwald hot air engine. It came to me at the end of 2009.
(http://i110.photobucket.com/albums/n95/Dayjo/pa210003.jpg)
It isn't well! The main bearings are too far apart, and the flimsy crank is flexing. >:(
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020559.jpg)
This is the best it has ever run.......
https://www.youtube.com/watch?v=1jYypC74hik
My thoughts are to fit an extra pair of bearings, held closer in to the crank throw.
Also, I thought it's flywheel looked better on my Maiwald flame licker. So, it was cannibalised.
Removing the bearings from the steel frames proved a struggle.
The frames are laser cut, and the bearings were just rammed in, much too tight.....
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020565.jpg)
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020568.jpg)
A pair of inriggers. The excess material will be removed later.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020570.jpg)
A bit of a shock, finding swarf in the displacer pot! Impacted onto the brass bush. Very poor workmanship..........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020563.jpg)
This was the state of play, at knock off........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020571.jpg)
More to come, as and when. ;D
David D
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Hi David,
I have seen a few of those engines for sale and always wondered about them...
Now i know better! ;)
I managed to acquire a Maiwald about a year ago and it runs very well.
At the moment i do not have any pictures but will be adding it to my engine collection thread soon.
The swarf in the end cap worries me a bit, will have to look into that sometime.
Consider me following along with you!
Andrew
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Hi Andrew!
Not too sure where this will go to, or what delights lie in store. But, it's great to have you along with me..... :))
Lets just say, this engine could/ should be much better engineered than it is........ ::)
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After giving this thing a good coat of looking at, I decided it was much too wide.......
So, I reduced the alloy spacer by 10mm per side, to 48mm.
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020586.jpg)
Extended the thread on the beam pivot shaft. Then screwed on two nuts, and faced to make 48mm spacer rod.
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020585.jpg)
The frame relied on the wooden base, to hold it all square.
Drilled the frames for an extra 48mm spacer shaft, to triangulate and make it self supporting.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020581.jpg)
The beam pivot bearing had also seized. Turned an alloy bush, with a slight positioning step........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020587.jpg)
To hold it central........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020589.jpg)
The alloy big end/ crank assembly is much too flimsy. But, I'll give it one more chance......
Rebuilt it, using my favourite sleeve lock, at each end of the crankpin.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020590.jpg)
Progressing, steadily! ;)
David D
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Hi again, David! I'm watching along again. I always keep my eye on you. 'Fraid I might miss something spectacular! :)
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Hi again, David! I'm watching along again. I always keep my eye on you. 'Fraid I might miss something spectacular! :)
Hi Dean.
Really nice to see you're coming along too. :cheers:
I'm not too sure about spectacular....... But, I do try to provide an interesting climax! :whoohoo:
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Very slow progress, I'm afraid........
I assembled the crank frame with it's three spacers.
It's now rigid/ self supporting enough, to file the underside flat, to my surface plate.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020593.jpg)
Finished the inrigger bearing holders........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020594.jpg)
Glued into place. Aligned with a length of 4mm silver steel. Positioned outward, by a piece of foam........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020596.jpg)
Perfectly aligned.........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020600.jpg)
Rebuilt the crank assembly. Installed a temporary flywheel.
Oiled round...... And fired up..........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020601.jpg)
And........
It still wouldn't run! :wallbang: :wallbang:
Hmmmm.......... :help:
David D
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David D
I'm not too sure about spectacular....... But, I do try to provide an interesting climax! :whoohoo:
That should be interesting! Might is be :censored:
Back on topic here. It is looking good David. I have been watching silently in the background. It will be a nice one when it is finished.
Cheers :cheers:
Don
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Hi David,
Looks good so far!
Does it have a leak by any chance?
That swarf you found might have wore out the displacer bushing?
I have been known at times to use a slightly thicker oil on the displacer rod to ensure a good seal. :censored:
If i know you at all the next time i log in it will be chugging away... :D
Love all the upgrades you have done!!
Andrew
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Hi Don.
Ok. No more might be's...... Mebbe! :thinking: Thanks for your confidence in my rebuilding. :cheers:
Hi Andrew.
Thanks. Steady as we go.......
Leaks? Well........
I've covered up the power piston bore, and sucked on the displacer bearing, attaching it to my tongue, for as long as I could manage. Nowt wrong there! :ThumbsUp:
The displacer shaft is a really good sliding fit in it's bush. Feel, I'm missing something, somewhere..... :shrug:
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Well, here we go again........
After the fail, it was water tested. (http://freesmileyface.net/smiley/unhappy/thinking-016.gif) (http://freesmileyface.net/free-unhappy-smileys.html)
No dramatic bubbles, but, some water inside, on stripdown. :thinking:
Calculated the ratio..... That's ok at around 6 to 1.
I really don't like the pifflin', (out of square?), crank throws. So, I started to make another assembly.........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020622.jpg)
Then the tiny big end bearings arrived. :)
Turned two, 4mm thick discs, 16mm dia. drilled through 7mm, and mounted on a mandrel in r/ table.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020623.jpg)
Application of 4mm endmill........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020626.jpg)
Drill and tap M3.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020627.jpg)
Two new big ends, ready for loctiting........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020628.jpg)
Tiny, fiddly bits n pieces, that won't stay in me fingers. Or on the bench, once they've escaped..... Grumble......... >:(
David D
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Curiouser and curiouser.... :thinking:
Great update and nice work on those small, fiddly bits!
Maybe a bit of a :thewhip: to get it in line is in order?
Andrew
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Thanks Andrew.
A whip may just come in handy. I've tried almost everything else! ::)
Well..... Here we go, again!
I drilled the crankpin holes.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020640.jpg)
Luckily the assembly stayed temporarily pressed together, to allow a test run.
Assembled, with a pair of spare Mamod flywheels........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020654.jpg)
Fitted a new "wonderwick".
Fired up.
And it still wouldn't run. Again! :wallbang:
What's wrong with the thing??? :wallbang: :wallbang:
Everything's been checked/ re done!! Hasn't it?? :shrug:
Took off the hot cap. Sucked...... Hard...... It stuck to me tongue....... Nothing wrong with it!!!
Until, I poked a finger inside........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020643.jpg)
The wall thickness is around 9thou'. The end cap is 4thou', "tin"...........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020646.jpg)
I guess it was acting as a one way valve! :wallbang: :wallbang: :wallbang:
Sheesh!!
Sigh........
Nothing else to do, but make another, more robust cap. :(
Couldn't find any 1"od tube in the bits tub.
Mrs Drillin's exercise bike, now has a 2" shorter saddle stem. (From inside the frame tube). Hope nobody tells her...... :paranoia:
Topped to 24mm+. Bored to 23mm.........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020647.jpg)
Friction turned an end cap........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020648.jpg)
Couple of thou' under bore size.........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020649.jpg)
Silver soldered together........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020651.jpg)
Cleaned up, quite nicely........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020653.jpg)
I'm starting to worry about me. I don't get upset any more. I just expect things to go wrong........
And they do. Regularly! :wallbang: :wallbang: :wallbang: :wallbang:
Machining a new, thicker flange, tomorrow. Probably! ;)
David D
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Good find David!!! :ThumbsUp:
One way valves in Stirlings do not work, especially on the hot cap... :rant:
Hopefully this will be the start of a good thing!
I have a good feeling about this one this time!
:pinkelephant:
Andrew
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"I just expect things to go wrong... And they do."
Well David, that should keep the disappointment factor low. ;D
You're doing great there. You really have a knack for sorting out unseen problems in all these orphans.
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Andrew, Dean.
Thanks for your confidence in me!
I actually have had a few misgivings, this time........ :-\
Found one of my penny washers was the right o/d, for a 50% thicker flange.
Bored it to just slip over the original........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020673.jpg)
Marked the 12 oclock position, for orientation. I could then spot, and drill through, 'cos the holes were not in any sort of pcd.
Turned a step on the cylinder to support the flange in position.........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020684.jpg)
Silver soldered together.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020685.jpg)
Looks ok, I think........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020686.jpg)
Fired up, using a different burner
We got a very hesitant runner!!
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020697.jpg)
It reminded me of my little grandaughter, when she runs. All arms and legs, and stopping every few seconds!
Very hesitant!
So, I lubed the piston, with slide oil, and it just took off........
https://www.youtube.com/watch?v=U6t5qWivWH0
That will do for now! :pinkelephant: :ROFL:
But!
Steel piston. Loose fit, in an alloy cylinder. Don't like that idea!
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020703.jpg)
Do I make an alloy piston?
Or brass?
Do I open it out, and sleeve with steel, and brass piston?
What does the Team think?
David D
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It does run quite well now, David. All knees an' elbows is a fun way to put it. ;)
Are you worried about the piston for some reason, David? It seems to be doing okay in it's position in life.
If you want to change it, I would go for a brass one in the aluminum bore. That combo has work well for
me in a few engines of the past. Free machining leaded brass has some good self lubricating qualities.
BTW, the new hot cap looks really nice!
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Dean.
Thanks for your kind comments.
The steel piston has been machined under 10mm nominal. (Don't remember how much, at the mo.).
A 10mm endmill shank, wobbles in the bore.
The engine will only run for the 1 minute or so, it takes the slide oil to "melt" into the bottom of the cylinder. It then stops, while puffing smoke!
I would prefer to give it the customary, 1 drop of 5W-30. As I do to my other engines!
A new brass piston sounds good to me! :ThumbsUp:
David D
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I think I should have shown this video first.
Taken after the previous one, it shows the engine puffing out oil smoke, before stopping........
https://www.youtube.com/watch?v=9aLTNfGqcBQ
Total thick oil, run time was only some 2 minutes. I guess slide oil doesn't like elevated temperatures!
David D
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Excellent stuff David!!!!!
You have the worlds first hit and miss Stirling! :pinkelephant:
Wonderful achievement indeed!!!
Congratulations!
Andrew
EDIT: Sorry i was checking the forum while SWMBO was shopping.
I hate typing and browsing on my iPhone....
Now it really looks like a hit and miss, with smoke as well!
Looks like it sucked the oil into the piston chamber.
At least it is running and no longer a :no idea:
Great work, excellent modifications!! :ThumbsUp:
Andrew
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I'm a bit late in the day here, but if ever you need a new hot end, got a quick tip, the steel case of a size C Nicad battery has an outside dia of 1.02"/26 mm, and just under 50 mm long (the total length of the battery is 50 mm).
I'd put a steel sleeve in the cylinder, and a cast iron piston. I don't like the idea of using aluminium against any metal, although I believe anodised pistons work OK. Ian S C
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Thanks Andrew.
When finished, I'm aiming for the hit n miss look. Using a pair of original diameter flywheels, which I've had cast specially for me.
Thanks Ian.
I'll remember that battery tip!
I ummed an arred for a while. Then decided to make a new alloy piston, just to see if it would work.......
Realising there was 4mm spare space below the piston, I made the new one 3mm longer.
It stopped with a clunk, at the wear ridge made by the old piston!
So, I shortened it....... It still insisted on hitting the wear pattern!
So, I built the crank assembly, properly, while I thought about sleeving the cylinder........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020711.jpg)
The cylinder is 10mm bore, and the bottom of the fins is around 14mm dia. So, I can only afford a sleeve with a wall thickness of1mm.
I have ordered a length of cast iron. I think I'll try a cast iron piston, too! :)
David D
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David, there is a company called K&S that makes brass shapes for modelers. Maybe you've heard of them.
They make thin walled brass tubing, and the brass is drawn, so quite hard. You might be able to use a 7/16"
or 11mm OD tube to sleeve your cylinder, and it will only take up about 1mm of material in total. The tubing is
.014" wall. I've used it for cylinders on wobblers. Might work out for you as a sleeve. It's quite tough.
Most hobby shops I've been in here have a K&S metal display. I know they sell world-wide. Just a thought...
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Thanks Andrew.
When finished, I'm aiming for the hit n miss look. Using a pair of original diameter flywheels, which I've had cast specially for me.
Thanks Ian.
I'll remember that battery tip!
I ummed an arred for a while. Then decided to make a new alloy piston, just to see if it would work.......
Realising there was 4mm spare space below the piston, I made the new one 3mm longer.
It stopped with a clunk, at the wear ridge made by the old piston!
So, I shortened it....... It still insisted on hitting the wear pattern!
So, I built the crank assembly, properly, while I thought about sleeving the cylinder........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020711.jpg)
The cylinder is 10mm bore, and the bottom of the fins is around 14mm dia. So, I can only afford a sleeve with a wall thickness of1mm.
I have ordered a length of cast iron. I think I'll try a cast iron piston, too! :)
David D
Dave
You could step the diameter of the long piston to clear the wear ridge.. it will still displace most of the air... just not get hung up on the wear ridge...
Dave
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Dean.
Thanks for the nudge! I've just ordered a length, from CJW Steam.... http://www.ebay.co.uk/itm/120950241466?var=420084900656&ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648
Should go well, with a carbon piston.
The ci hasn't arrived yet, and hobby things are at a bit of a standstill at the moment. I'll make my mind up, on the other side.....
Thanks Dave!
I already tried that, with the alloy piston. But, it must be a really weird shape down there, with the ci piston flapping as it changed direction........
A drill out and re-sleeve, with a longer piston is the way to go, I think! :ThumbsUp:
David D
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You should be able to get the sleave down to a wall thickness(thinness) of
1 mm, maybe thinner, it should just slide in with a bit of loctite. The cylinder of my smallest motor is 3/8" bore, cast iron, with a CI piston, skirt thickness .75 mm,crown 1.5 mm, a gudgion fork scews into the crown wit a 3 mm thread. Until I work out how I'll do it, photos can be seen on the ME & MEW web site.
Think of the energy it took to wear the cylinder as it has! Ian S C
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That's the stuff, David. With the .014" wall it will be minimal material loss for the cylinder to re-sleeve it.
I keep a number of sizes of that tubing around. I always find uses for it.
That same company (K&S) makes tubing down to 1/16" OD, and they offer hard wall and soft in the smaller
sizes. The soft is annealed, and is very nice for bending without kinks. They have soft copper tube, too, along
with aluminum and SS tube (and lots of other shapes and sheets, as well as telescoping round and square).
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Dean.
Thanks for the nudge! I've just ordered a length, from CJW Steam.... http://www.ebay.co.uk/itm/120950241466?var=420084900656&ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648
Should go well, with a carbon piston.
The ci hasn't arrived yet, and hobby things are at a bit of a standstill at the moment. I'll make my mind up, on the other side.....
Thanks Dave!
I already tried that, with the alloy piston. But, it must be a really weird shape down there, with the ci piston flapping as it changed direction........
A drill out and re-sleeve, with a longer piston is the way to go, I think! :ThumbsUp:
David D
YUP That's the right way to do it.
Dave
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David, I am joining this thread a bit late but admire all the work you have done thus far. Have you considered graphite for the piston? It would be self lubricating and thermally stable. I am surprised the oil in the power piston cylinder doesn't gum up some between runs. Just a thought.
Bill
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This little one is a similar size, power piston 3/8" x 1/2" stroke. The hot end is made from the steel case of a AA size Nicad battery.
The burner wick is 1/8" dia, made of a bundle of 22SWG iron florists wire, an idea found in vol 1 (1898) of Model Engineer. Timed it the other day, 4ml meths 35min. The tank will hold 30 ml. Ian S C
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Hi Chaps!
So sorry for the delay. (http://serve.mysmiley.net/rolleye/rolleye0014.gif) (http://www.mysmiley.net)
I've not dropped off the planet, just yet! ...... As a pal used to say. "Everything in me favour's, against me", at the moment. (http://serve.mysmiley.net/mad/mad0235.gif) (http://www.celebrityfashionarchive.com)
A bit of gung ho machining of a 5" flywheel, and the lathe gave a couple of gentle pops, and went into quiet mode! :zap:
Since then, several aspects of daily life have gone wrong. And, a lot of other things haven't gone right.
It's blummin amazing, how everything comes at once! (http://serve.mysmiley.net/sad/sad0137.gif) (http://www.mysmiley.net)
The Maiwald parts lie just where I left 'em. Before they were covered with multiple parts from the stripped lathe..... Which is now rebuilt, again! (http://serve.mysmiley.net/happy/happy0034.gif) (http://www.mysmiley.net)
Give me a few more days..... Probably!
David D
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David
That poor lathe it keeps telling you its tired but you wont let it rest in peace , glad you have it sorted
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I got curious as to what kind of lathe you have and ended up reading the entire thread.
Don't know how I missed it. Very enjoyable.
Hope you get the lathe running again soon. Let us know what happened.
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Hi David, sorry to hear the lathe died.Did you manage to get some graphite just cannot remember the dia you needed
cheers
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David, did you get the new motor for your lathe yet?
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Thanks for your kind words and interest, Chaps.
Stuart. From yesterday, we're up and running in, again.
Zee. The lathe started off as a Chester Conquest 7 x 12, around 8 years ago. It's now had a few adventures, additions and subtractions, along the way!
Frazer. Some graphite is on it's way. To join the K&S brass tube, and the 30mm cast iron. Several options available now!
Dean. That motor did eventually arrive......... Smashed! ...... Build story on Modder, eventually.
For the moment, the distractions continue........ Mrs. Drillin an me spent a lot of last night sitting alongside a trolley in A&E, again......
David D
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David
Hope the patient on the Trolly gets sorted out ASAP
Stuart
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Thanks for your much appreciated concern Stuart! (http://serve.mysmiley.net/happy/happy0034.gif) (http://www.mysmiley.net)
But, I don't want to make much of it......
I only used that bit of info, to show the many and varied directions I'm supposed to be going in, all at the same time! (http://serve.mysmiley.net/rolleye/rolleye0014.gif) (http://www.mysmiley.net)
I managed to slip into the shop for 10mins this morning, and fitted the 5" chuck, with the flywheel casting.
Just a quick facing cut at around 500rpm.........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020762.jpg)
That will do for now! Just like a proper, grown up lathe....... (http://serve.mysmiley.net/happy/happy0144.gif) (http://www.mysmiley.net)
David D
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Hi David - I've come late but now caught up on your thread. A good little read it is too - will keep following.
Steve
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Thanks for all your kind comments, hint n tips etc. Over the past, too long....... :facepalm:
I've had a couple of gentle adventures, which you might like to see.......
The story of the lathe rebuild..... http://madmodder.net/index.php/topic,7560.0.html
And, I had the time to post some gonna do's, I've done...... Also, complete some more... http://madmodder.net/index.php/topic,7643.0.html
But! the big news is....... I've got Maiwald things underway again! :whoohoo:
Assembled together what I could find........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020903.jpg)
Cast iron. Graphite. Brass tube. Also, 2 packs of M2 grubscrews...... Dunno what they are for! :-\
And set up, to drill for cylinder sleeve......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020904.jpg)
Then...... The phone rang! :facepalm:
No time to get back to it, until next week. But....... We're progressing, at last! (http://freesmileyface.net/smiley/others/others-249.gif) (http://freesmileyface.net)
David D
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I drilled out the cylinder with 7/16" drill, held in a 12mm R8 collet. Didn't think R8 collets would compress willingly, that far.....
The 7/16" K&S tube needed it's o/d reducing by a couple of thou. So, I turned a mandrel......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020906.jpg)
Leaving the o/d a little rough, for grip, stuck it in place using my favourite sleeve retainer.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020909.jpg)
Will drill through to the displacer chamber tomorrow, when it's cured.
Question time now. Re-graphite pistons.......
I've never turned a piston, without some oil grooves.
Do I still groove a graphite one. Or, leave it plain? (http://serve.mysmiley.net/mad/mad0270.gif) (http://www.mysmiley.net)
David D
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Hi David, All the ones Ive made are just plain no grooves. Brown paper bag or card is good to polish them to size
good luck and switch the phone off :LittleDevil:
cheers
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Dave SD
I too thought graphite was self-lubricating ... no oil ... no oil grooves .... ???
Never used graphite, where did you get it, Noggin end ???
Dave BC
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Noggin end but also try art shops much cheaper
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Art shops ??? What sort of Art shops ??
The 'Slap-Dab' aisle at B&Q or something more exotic ??
I suspect they do charcoal sticks etc. but why Graphite ??
Where should I be looking?
The only thing I know it's used for is melting gold/silver.
Dave BC
EDIT looked on Amazon ... could only find this
http://www.pullingers.com/P~782259~Caran-d%27ache-Grafcube-Graphite-Stick-15mm-9B
Piccy don't look very cubic to me :disappointed:
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Have a look for Cretacolor graphite sticks they go from 5/16 t0 5/8 dia go for H grade or HB you use them for drawing :ThumbsUp:
Try the www.heatoncooper.co uk/ studios as a guide
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Dave, Frazer.
Not for lubrication purposes! I wondered if there might be some pressure sealing advantage, to have grooves.......
Here's the big bar. For a future project, mebbe. http://www.ebay.co.uk/itm/Graphite-Bar-/200808907492
And, here's the long thin un. http://www.ebay.co.uk/itm/360482547877?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Thanks for the polishing tip, Frazer! :ThumbsUp:
David D
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Hi Dave, don't know if grooves would be an advantage or not.
Thanks for the links they will be handy.Oh and I forgot to say but you probably already know,try and rig a vac cleaner up as its filthy stuff and the dust gets everywhere.
Nice to see you making headway again I seem to be going backwards at the moment but it happens :fos:
kind regards
frazer
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Well....... I managed a workshop hour, this afternoon.
Pity it wasn't more productive......... :facepalm:
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020919.jpg)
I was trying to emulate the original piston, only longer........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020920.jpg)
Guess I'll have to make a clevis, down inside the skirt. Held in with an M3 screw from 'tother end. (http://serve.mysmiley.net/sad/sad0137.gif) (http://www.footballerpictures.co.uk)
This stirring stick graphite is a lot coarser than I imagined it would be! (http://serve.mysmiley.net/mad/mad0270.gif) (http://www.mysmiley.net)
David D
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Hi David, a clevis maybe the way to go.That graphite definitely looks very coarse compared to the stuff Ive used.
Still banging my head against the wall this end so know the feeling
Never mind tomorrows another day :ThumbsUp:
best wishes
frazer
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A few tomorrows along, Frazer....... I had another go. :ThumbsUp:
Thanks for the idea Nick. :cheers:
I made another one........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020937.jpg)
It reminded me of compressed, dried leafmold.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020946.jpg)
Couldn't polish it to round. It went all shapes, like a piece of grainy softwood. :thinking:
And, the engine would only run, when persuaded with a small blowlamp. :wallbang:
Think I'll make a brass piston, if I can get the time, tomorrow. :)
David D
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Dave
Does look somewhat scratty, doesn't it. ?? :(
I've been fooling about with the graphite rod from a D-cell today, very fine grained that is ... hardish but machineable.
Hmmmmmm..... sure you haven't got an overcooked Hobnob ???
Dave
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With regard to graphite, it's my understanding it's used in electro-discharge-machining. Don't know if this helps or not:
http://graphitestore.com (http://graphitestore.com)
--Tim
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This thread on MM has some sources for graphite rod: http://madmodder.net/index.php?topic=4144.0 (http://madmodder.net/index.php?topic=4144.0), like
eBay: http://www.ebay.com/itm/Fine-Grain-Graphite-Rod-1-250x12-Glass-Blowing-Lampwork-/390050108560?pt=LH_DefaultDomain_0&hash=item5ad0cc5490 (http://www.ebay.com/itm/Fine-Grain-Graphite-Rod-1-250x12-Glass-Blowing-Lampwork-/390050108560?pt=LH_DefaultDomain_0&hash=item5ad0cc5490)
and Jerry Howell: http://www.model-engine-plans.com/partskits/miscsupplies/index.htm (http://www.model-engine-plans.com/partskits/miscsupplies/index.htm)
Simon
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Good going David - you'll have the orphan sorted soon enough :ThumbsUp:
Can't recommend graphite sources from my nook - I'm still looking for the same :( , but you're right, that bit you have there seems a bit on the rough side...
Kind regards, Arnold
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Hi David , sorry to see a no progress day.That graphite looks really poor stuff never seen any thing that rough.On Low Temp sterling I mix fine graphite dust with Araldite and cast them but it don't like high temps
What size is the stuff you need I may have a bit . I think EDM forms are made from carbon not graphite not sure
Oh well as they say tomorrows another day :naughty:
Good luck
best wishes
frazer
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There is a supplier of Graphite not 10 miles from Mr. Stilldrillin ....
Although I have no idea if the grades they have are suitable.
http://www.olmec.co.uk/
You can download the price list from the site.
But, as Mr. Steptoe Jr. [ almost ] said, ' You 'as to'ave ample akkers'
Woe, woe and thrice woe. ( could well be more that that actually :'( )
Although they seem to be a good few % cheaper than Noggin End, just lengths like 1100mm available ...
Dave BC
Price List Download bottom of this :
http://www.olmec.co.uk/graphite_rods.htm
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Davids a true Yorkshire man through and through says he a true :Lol:
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Thanks for your comments Chaps!
Dave. I think a recycled hobnob would have done the job much better.
I've already spotted the "nearby" supplier...... Think I'll wait for next year's pension increase!
Tim, Simon. I'm on the wrong side of the pond, to use those suppliers. Prices look ok, though!
Arnold, Frazer. Today is another day, as we say.......... I made a brass piston. It looks much better than the compost one! :ThumbsUp:
It even runs much better.........
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020948.jpg)
All parts are just bodged together....... It wasn't really happy, but I left it running for some 10mins or so.
Stopped it. And realised, the clonk was the piston hitting the bottom of the cylinder!
1mm removed, tomorrow, should make all the difference.
Ready for finish build, now...... :)
Happy little Drillin! (http://freesmileyface.net/smiley/music/dancing-banana-032.gif) (http://freesmileyface.net/free-music-smileys.html)
David D
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Wot no video,looking canny :whoohoo: :pinkelephant: :cartwheel: :ThumbsUp:
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VIdeo, Frazer? :???:
Awww..... go on then........
https://www.youtube.com/watch?v=IFmBIz25C3Y
David D
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Wow looking good.Thanks for the video :ThumbsUp:
cheers :naughty:
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Well done that man :ThumbsUp: :ThumbsUp: :ThumbsUp:
:cartwheel: :cartwheel: :cartwheel: :cartwheel: :cartwheel:
Stew
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Looks and sounds read good David!
Thanks for the video.
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Frazer, Stew, Carl. Thanks for your comments! :cheers:
Got a little more done........
When I first saw this engine, with it's large flywheel, it reminded me of a hit n miss engine. Which needs a pair of wheels......
I've now chopped rather a lot of ali from the castings.
With red spokes, would this look ok?
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020963.jpg)
Or, are they a little on the large side?
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020965.jpg)
David D
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i like the look of it as it is personally
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Yup ... +1 for leaving it be. Nowt wrong with it. :praise2: :praise2:
What's the hot-cap anyway ?? Stainless or non stainless ??
Looks like it's not, but piccys don't always show very well .
Dave BC
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Hi David,Those flywheels are to big you will be far better of sending them to me :Lol:
Coming on well looks like you managed a bit of play time :ThumbsUp:
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IMHO: I'd polish the rims and paint the spokes.
Jo
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I keep on looking at Google Images, hit n miss engines. Now I think black spokes with polished rims, is the way to go.
(I think I showed this pic, earlier). The original, repainted and fitted to another engine.......
(http://i110.photobucket.com/albums/n95/Dayjo/P6150001.jpg)
My main concern was that a pair this diameter, might look too much. Intending to finish off with alloy pulleys to the outside of the hubs.
Dave. The m/s hot cap, was made from part of Mrs. Drillin's exercise bike. Not stainless.......
David, Frazer, Jo. Thanks for your interest, and input! :ThumbsUp:
David D
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I managed a few minutes playtime today......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020992.jpg)
What cher reckon?
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020994.jpg)
First coat, only. Another one, sometime, then clean up the rims.
David D
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Looks good :ThumbsUp:. I would recommend that you don't try lighting up and running her on top of the keyboard :ROFL:.
Jo
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I like the larger flywheels, it looked a bit gangly before. Nice work.
Lee
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you won me over, it does look nicer painted
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Looks great from here!
Dave
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Can't remember if you said, but are the flywheels aluminium? Ifso they look just about the right size. What diameter is the hot cap? Ian S C
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very nice contrasts between the red, black and metal finishes
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Thanks for your comments, and smiles Fellas! :cheers:
I've placed it where I can see it, on the shelf above the computer. It has presence, now...... :ThumbsUp:
Ian. The flywheels are aluminium. Cast as a heavier rimmed copy of the original. I machined 'em as a much lighter rimmed version. ;)
The hot cap is 24mm o/d x 23mm bore.
Hope to get the grubscrews in, tomorrow, and give it another run.
David D
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Looking good Dave wont be long before you burn the paint :LittleDevil:
Whats next :facepalm:
best wishes
frazer
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:ThumbsUp: nice looking make over dave and looks good running. i like the paint job. jonesie
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Ooohhh....... Frazer! Steady on! (http://freesmileyface.net/smiley/surprise/surprised-034.gif) (http://freesmileyface.net/free-surprise-smileys.html)
There's more faffing around to do yet! Rod pivot pins, wooden base, new burner, mebbe. Then strip it down, and rebuild properly.
With the interruptions I'm having recently. This rebuild could run, and run...... (http://serve.mysmiley.net/winking/winking0019.gif) (http://www.mysmiley.net/free-confused-smileys.php)
Thanks Jonesie! (From another one, in real life)....... (http://serve.mysmiley.net/happy/happy0034.gif) (http://www.mysmiley.net)
David D
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David, I was thinking that if the hot cap were just a fraction larger in diameter, the case of a C size Nicad battery would make a good one, it is 1.02" / 26 mm, the next size down I'v never heard of, it's size RR, and is .90" / 22.8 mm dia, I'm always looking at objects, and thinking, now will that do!!for my next project.
The flywheels look great, I carve mine out of steel, and I'm too lazy to make curved spokes, in fact the first ones I made only had three spokes. Ian S C
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Hi Ian.
Thanks for the battery reminder! :ThumbsUp:
I do the same, with household items. Imagining what's hiding inside....... http://madmodder.net/index.php?topic=5732.0
A pal cast me several copies of the original flywheel. I wouldn't have the patience to chop one out of m/s...... ::)
David D
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Hi David, Nice to see another who goes round looking at things and thinking would that make a displacer/hot end or what ever :Lol: :Lol:I just get that knowing look from my better half
Good tip on the batteries it had never crossed my mind
The Mailwald is looking good I'm a bit surprised how much work has had to be put into her
Thanks
frazer
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Stainless Steel salt and pepper shakers, stainless sugar bowls, kitchen ware is quite fruitfull, I hunt out secondhand shops, never had any problem going around with a rule, measuring things.
Ian S C
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Well...... This is still progressing, slowly. :-\
Unfortunately, the enthusiasm's been a bit lacking recently. Spent a lot of time with other things, and the gonna do's.
Made a new burner......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1030029.jpg)
Complete with removable cap, held with O ring.......
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1030031.jpg)
Then I spent a nice hour, this afternoon experimenting with burner settings.......
https://www.youtube.com/watch?v=x7nQRzmu0nA
Just the rod lengths left to fiddle with, and make pivot pins, instead of the M3 screws.
David D
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Hi David, nice to see you back on track.Looking good :praise2: :praise2:
best wishes
frazer
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Yes...... I know, it's been a while. (http://www.freesmileys.org/smileys/smiley-rolleyes010.gif) (http://www.freesmileys.org/smileys.php)
So frustrated with the slow progress, and other frustrations. :wallbang: I put it back in the toy cupboard, for 8 months...... :ThumbsUp:
Finally, got around to it, last week. Everything went well, for a change! :D
I really like the, "teamwork" flywheels........
(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1030639_zps14fc1604.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1030639_zps14fc1604.jpg.html)
(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1030641_zps838598c7.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1030641_zps838598c7.jpg.html)
(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1030642_zps38004403.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1030642_zps38004403.jpg.html)
(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1030644_zpse78dc01e.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1030644_zpse78dc01e.jpg.html)
JB-welded a stainless disc, to keep the burner in place.......
(http://i110.photobucket.com/albums/n95/Dayjo/Return%20Album/P1030655_zps47627c11.jpg) (http://s110.photobucket.com/user/Dayjo/media/Return%20Album/P1030655_zps47627c11.jpg.html)
And, the final video......
https://www.youtube.com/watch?v=RhXIToNGxSY
It's been a very frustrating job. But, it's all I hoped for, when I started out. :)
"I'm a bit pleased with that"....... ;)
David D
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"I'm a bit pleased with that"....... ;)
David D
And so you should be, you have done a lovely job :ThumbsUp:
Jo
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Great job David. Especially like those flywheels.
Vince
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Great looking engine Dave!
Well done!
Dave
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She's a beauty David !! Sounds wonderful ticking over in the video...and excellent pictures as well.
Bill