My version of Potty Mill engine

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My version of Potty Mill engine

This topic has 17 replies, 11 voices, and was last updated 8 May 2021 at 22:28 by David George 1.

Viewing 18 posts - 1 through 18 (of 18 total)

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11 April 2021 at 20:13 #539201
David George 1
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@davidgeorge1
Just finnished the valve section and eccentric and done a first assembly. I have changed a few bits to my liking to give it a bit more strength.

David
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11 April 2021 at 20:13 #3447
David George 1
Participant
@davidgeorge1
11 April 2021 at 20:30 #539207
Jim Nic
Participant
@jimnic
Looking good David.

What's in the box on top of the valve chest?

Jim
11 April 2021 at 20:30 #539208
Neil Wyatt
Moderator
@neilwyatt
Nice job, David.

Next decision – to paint or not to paint?

Neil
11 April 2021 at 21:06 #539222
Harry Wilkes
Participant
@harrywilkes58467
Nice
11 April 2021 at 21:39 #539235
Nigel Graham 2
Participant
@nigelgraham2
That's an elegant machine!
11 April 2021 at 22:12 #539238
David George 1
Participant
@davidgeorge1
Hi Jim the box is an exhaust with the outlet on the end. I have drilled the exhaust outlets on the top and cross drilled to end.

Not tried it out yet and have some finishing to do on edges and corners as well as lube bits and pieces then clean up the flywheel casting. I probably will paint it red.

David
12 April 2021 at 10:26 #539292
Jim Nic
Participant
@jimnic
Thanks for that David. One of the things I like about Stew Hart's designs is that they can be personalised fairly easily. I did a similar thing on my version but had the inlet on top and the exhaust on the side.

I like your connecting rod too, I must bear that in mind

Jim
12 April 2021 at 10:48 #539300
SillyOldDuffer
Moderator
@sillyoldduffer
David's PottyMill is better finished than both of mine!

Admittedly both were made for the learning experience, but I paid more attention to finish on the second. Perhaps I should make a third, or several…

Curiously my rather rough number 1 runs noticeably better than engine number 2. I suspect it's because №2 is a tighter fit all round, and needs running in! I'm still slightly miffed the extra-effort version wasn't as good as the trainee bodge!

Dave
12 April 2021 at 10:57 #539307
Hopper
Participant
@hopper
Posted by SillyOldDuffer on 12/04/2021 10:48:20:…

…Curiously my rather rough number 1 runs noticeably better than engine number 2. I suspect it's because №2 is a tighter fit all round, and needs running in! I'm still slightly miffed the extra-effort version wasn't as good as the trainee bodge!

Dave

As Mr Harley said to Mr Davidson, a little extra clearance never got in the way.

I have the same problem: using toolmaker's clearances and tolerances and ending up with things too damn tight for real world conditions..
12 April 2021 at 10:59 #539308
Hopper
Participant
@hopper
Posted by David George 1 on 11/04/2021 20:13:29:

Love the high-performance con-rod. You'll be able to flog the daylights out of the engine with no fear of that letting go!
25 April 2021 at 13:57 #541515
David George 1
Participant
@davidgeorge1
It lives. I had the first run on my engine.

I had it connected to tyre inflator, only 5 PSI and it runs great.

David
25 April 2021 at 14:02 #541516
Steviegtr
Participant
@steviegtr
Brilliant David. Nice job.

Steve.
25 April 2021 at 16:06 #541535
JasonB
Moderator
@jasonb
That turned out well.
25 April 2021 at 18:32 #541552
geoff walker 1
Participant
@geoffwalker1
Well done David top quality stuff.

Are you going to set it up with that boiler of yours?

Go on let's see it running on steam.
26 April 2021 at 14:53 #541668
mechman48
Participant
@mechman48
Super job David; any advice on how you prepped the aluminium pror to painting… was the paint rattle can or mini spray gun ?

George.
26 April 2021 at 15:44 #541680
David George 1
Participant
@davidgeorge1
Hi George. I used rattle can paint. First an etch primer then a primer followed by finnish coat with fine wet and dry between coats.

David
8 May 2021 at 22:28 #543978
David George 1
Participant
@davidgeorge1
Got my pottymill on steam today. I had a try with the boiler on the wobbler and lamp but the solid fuel wasn't sufficient to power the pottymill. I ordered a gas burner from Forests and it came today and it ran perfect.

https://youtu.be/VhrElKNqgyY

David

Edited By JasonB on 09/05/2021 06:56:26
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