My version of Potty Mill engine

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

Looking good David.

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

Jim

Nice job, David.

Next decision - to paint or not to paint?

Neil

Nice

That's an elegant machine!

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

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

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

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..

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!

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

Brilliant David. Nice job.

Steve.

That turned out well.

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.

Super job David; any advice on how you prepped the aluminium pror to painting... was the paint rattle can or mini spray gun ?

George.

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

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.

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