Author Topic: Potty Simpson and Shipton Short Stroke Engine (Read 66038 times)

sbwhart · « **on:** December 18, 2011, 05:13:24 AM »

I've not bin Idle these last couple of weeks I've bin doing a bit of research on an engine that caught my eye. Its a bit of a strange beast it has a rotary action that I can best describe as a captive eccentric. The original was first displayed at the great exhibition and was shown powering some textile machinery, as far as I can find out only two were made, though there is very little documentary evidence for the second.

I've got enough of the drawing done to show you an assembly, but I still need to do more detailing of the parts, but its enough to give you an idea of how it will look.

I'll slowly work on the drawing and start to get material together ready to make a start and cut metal in the new year.

Stew

Rob.Wilson · « **Reply #1 on:** December 18, 2011, 05:26:48 AM »

Hi Stew

Looks like this is going to be another interesting build

design looks great

Rob

saw · « **Reply #2 on:** December 18, 2011, 06:48:21 AM »

Wow, where do you find those strange engine ?

I will be follow this with great interest.

BillTodd · « **Reply #3 on:** December 18, 2011, 08:27:48 AM »

Wonderful

Please post plenty of pictures of the build.

This was one of the first engine I animated for Doug.

Doc · « **Reply #4 on:** December 18, 2011, 10:53:25 AM »

That is a strange engine got my curiosity up for sure. I'll be keeping my eye on this one.

arnoldb · « **Reply #5 on:** December 18, 2011, 12:03:42 PM »

Design looks great Stew

- I'm looking forward to your build

, Arnold

Dean W · « **Reply #6 on:** December 18, 2011, 07:23:26 PM »

That'll be a neat one, Stew. I have plans for one like that. Quite an oddball.

SPiN Racing · « **Reply #7 on:** December 19, 2011, 09:23:28 AM »

Looking forward to seeing it go together!

Deko · « **Reply #8 on:** December 19, 2011, 02:02:30 PM »

Hell's bell's Stew, how on earth do you do it ?

I am now totaly convinced that you NEVER sleep.

Cheers Derek

sbwhart · « **Reply #9 on:** December 19, 2011, 02:14:39 PM »

Thanks you all for your support and interest Guys

Bill:- bin looking at your animation for the Dake engine (I think it was yours) now if you guys think this ones a strange beast you should try doing a google for William Dake square piston engine thats a double

no treble.

Dek this is the one I'm going to Mr Hustons metal imporium for a scratch around for.

When I've got the drawing completed I'll put them up for offer if anyone wants a copy, just send me a PM but wait until I've got them finished.

Stew

Brass_Machine · « **Reply #10 on:** December 19, 2011, 02:40:24 PM »

This looks like a cool engine. Can't to see the build.

Eric

BillTodd · « **Reply #11 on:** December 19, 2011, 03:03:01 PM »

Quote

Bill:- bin looking at your animation for the Dake engine (I think it was yours)

these ones ?

http://wktodd.webspace.virginmedia.com/animations/

sbwhart · « **Reply #12 on:** December 19, 2011, 03:44:25 PM »

Thats the one Bill

sbwhart · « **Reply #13 on:** January 06, 2012, 10:57:06 AM »

Started to cut metal on this engine, first job cut the cylinder out of a chunk of brass and square it up

Next using my new digital height gauge from Santa mark it out and light centre pop the lines.

Then in the mill with a wobbler find the edge of the lump and bring the mill onto its centre, and set the vice stop.

Then working to the marked lines chew out the edge to start forming what will be the port face flip it over and do the same on the other edge.

Turn it on its end a chew out the end edge, flip it over and do the other end

Sit it level on parallels check that we are still on centre, and drill a couple of 13mm on holes on the what will be the centre for the cylinder.

I was getting a bit cold at this point so went in for a warm, I'll pick it up again tomorrow.

Any one who would like a copy of the drawing just send me a PM with your email adress on.

Stew

Brass_Machine · « **Reply #14 on:** January 06, 2012, 12:01:06 PM »

Looking good Stew!

Raises hand! Would like a copy.

Eric

Stilldrillin · « **Reply #15 on:** January 06, 2012, 01:25:36 PM »

Nice to see you're back into your shop again Stew!

I was beginning to feel mild withdrawal symptoms........

David D

sbwhart · « **Reply #16 on:** January 06, 2012, 01:51:50 PM »

Ok Guys big red face time I dropped a bollock with the drawing

I've made the cylinder too long, it should be the 30 + 15 plus 1.5 = 46.5

I drew it as 30 + 30 it was only after I had drilled it that I started to think that looks too wide better check it out,

Just measured things up and all is not lost I can still fit the correct width of cylinder in, but I need to chase the change through the drawings as it will impact on the con rods, cylinder covers and the valve chest.

So it's back to the drawing board.

You'r top of the list Eric for the amended drawings

Stew

saw · « **Reply #17 on:** January 06, 2012, 03:04:27 PM »

Nice Stew, this project would be very interesting to follow, and I will be watching you

arnoldb · « **Reply #18 on:** January 07, 2012, 09:12:31 AM »

That's bad news Stew. Still, all part of the fun of a from-scratch-design

- I'm sure you'll have it sorted quickly!

, Arnold

NickG · « **Reply #19 on:** January 08, 2012, 03:12:55 AM »

Happy New Year Stew, am quietly following. I've seen these engines which look very interesting ... always thought they were too complicated to find out how they work but now I'll get to see all the detail! Keep up the good work

sbwhart · « **Reply #20 on:** January 14, 2012, 10:50:10 AM »

Cheers Guys

Things have bin a bit slow on this over the last week, what with having to redraw some of the parts, and other things getting in the way:- plus I went down with the dreaded puckes.

All fit now and bits redrawn.

First job was to put the bollock right.

So plugged the holes and respotted in the correct position.

In order to get things in the correct position I had to use a boring head, just opened the holes up just enough to give a good register for a mandrel.

Then turn a mandrell up a nice fit in the hole.

Then transfer chuck and mandrel over to the RT and bolt the cylinder to it.

Then machine the rads around the rim

Turn the RT onto the horizontal and machine the pocket around the top.
First with a radius cutter

Then take the meat away

Then do the same with the base but leaving a flat for the foot to solder too.

Your probably a bit baffled as to where I'm going with this, well I'm baffled as well

Stew

saw · « **Reply #21 on:** January 14, 2012, 11:11:25 AM »

Looking good Stew

Stilldrillin · « **Reply #22 on:** January 14, 2012, 01:13:06 PM »

Baffled? ......... Baffled! ........ Yes!

But, don't concern yerself Stew. I have faith......... I know it'll all come right, eventually.

I look forward to the usual happy ending.........

David D

sbwhart · « **Reply #23 on:** January 16, 2012, 01:07:52 PM »

Got a little done today: made the cylinder base this will be silver soldered to the cylinder.

Started life as a bit of 12mm thick brass sqaured up and milled to size.

Then first with a end mill and finishing off with a 10mm bull nosed cutter machined out a plinth in its middle.

It fits on the flat like this

I'm not going to solder it just yet the cylinder covers will need soldering as well so I'll do them together.

Stew

Rob.Wilson · « **Reply #24 on:** January 16, 2012, 02:03:34 PM »

I ,,, but Stew ,,,,,,,will it be ready for Harrogate

Rob

PS ,,,,, cracking job by the way

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Author Topic: Potty Simpson and Shipton Short Stroke Engine (Read 66038 times)

Rob.Wilson

Rob.Wilson