Potty Simpson and Shipton Short Stroke Engine

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doubleboost:
Words fail me :bow: :bow: :bow: :clap: :clap: :clap:
I like the way you can make tiny bits look big :clap: :clap: :clap:
John

HS93:
I recently got to hold the drain taps that Stew had made , now I thought they where quite big for something like a 3" tractionnengine until he handed me one it was TINNEY I was very very impressed with them, :drool: :drool: even my wife who normally just says yea lump of metal had to have a look and was impressed (I think a first for heir) :bang: also this engine is one Heavy piece of nicely machined brass, I think l I know how it works now !

Peter

sbwhart:
Thanks Chaps

Peter it was nice meeting up with you and you'rs, its a shame it was in such sad circumstances

Well made the piston today its a job I've been putting off don't know whyi I guess I just had a funny for doing it.
I liked the idea of making the piston out of PTFE, the main reason is its slippy plastic and quite soft, and I figgured that if I made it just a coulple of though longer that the cylinder it would act as a good air seal against the covers :scratch: we'll just have to see how it works out the bottom line is to change it for steel if it don't work out.

I used very sharply honed tools it cut like butter with a great finish.

Set it up in the mill and drilled the off set holes.

Back on the lathe and resessed the faces.

Then parted off a length of 8mm silver steel (drill rod) and put a rough straight knurl into the middle.

Sorry its such a crap pic

Then gently tapped the rod into the cylinder the straight knurl acting as splines to give it grip.

Mounted it back in the lathe a carfully skimmed the cylinder to width

The cylinder covers wern't sitting flat so gave them a bash wif me ammer, and a rub on emery cloth on a flat surface.

This is how it looks in the bore

Stew

saw:
You are doing a fantastic jobb, nice to see that you are coming along very fine. :bow: :bow: :bow:

sbwhart:
Cheers Benni

Had a couple of sucessful days in the shop.

Made the crank webs, they are of the pinch clamp type so you can get them on and off due to the design of the engine.

First drill the holes 2 with 8mm crank pins 2 with 6 mm crank pins

Cut off with slitting saw

With two drill through the holes across top of vice, mill off so they are central, for the two cranks with the 6mm crank pin holes had to use a drill imm smaller

Drill and tap and open up half with a clearance drill

Cut the split.

Then with filing buttons file to shape, they still need a bit of tidying up and a rub with emery, but her they are with the buttons

Think they look a bit on the heavy side may thin them out a bit.

Next up the con rods the engine has four using 9/16 free cutting mild steel first cut off to length face them up so they are all the same and centre drill and turn up a lost centre.

With a part off blade put a couple of grooves into them to show where to stop and to give some clearance to the turning tool.

The with a running centre chew the meat out of the middle.

Slew the compound over a couple of deg and with a radius tool form taper toward the chuck, swap it round and tune the other end to form the barrel.

Cut the centre pips off then over on the mill cut the flats.

Called it a day at that and went for a brew and a snooze.

Stew

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