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@Richard Hed, The four rods are finished, but the split have only 0,3mm (0,012") thick, so not visible but it work very well; I understand (more of less) how the Corliss work. But to adjust all the parts together it's another song! But I don't understand how exhaust valves closes. For the...

Nobody for the explaining?

Now the gear and rods of the Corliss system The third picture is the Schaublin spherical turning apparatus. And of course, left and right tread. LeZap LeZap

Can someone please explain how the exhaust valves closes? Thanks LeZap

Yessss, I found one for you in Germany https://www.jt-modelle.com LeZap

Pictures speak for themselves LeZap

@Richard Hed : It's alway possible to simplify the original design, but I want to keep the spirit of early 1946. Thanks to Eloda Ray. LZ

And the bonnet and valve port cover LeZap

This are the exhaust and intake ports. Here comes the rotatives valves LeZap

Thanks for your considération. I try to be close possible to the spirit of the creator of this Corliss. (1946) Of course, it's much more easier to order rings by Amazon of other. But I don't look for easy way LeZap

Hi Dan, congratulation for the nice job! Did you have more information's about ignition system. On the "Red Devil" model, it's a low voltage ignitor inside the combustion chamber. What about the "Frisco" ? LeZap

Hello there, sorry I'm a little bit late on my post. Here's piston, connecting rod and cross head. + piston rings LeZap

The fine tread are also something complicate to do. There is a lot of. But the biggest difficulty is to stop just before the end of part. The cutting tool come very close. LeZap

I do it simply with a four independent jaws chuck. At first the external diameter à the right dimension, than fit the offset (0,4mm) and check with a Pupitast Turn the inside diameter at final dimension. Cut and do the Z LeZap

Thanks you for your help, I now better understand the necessity of offset ID/ED The two piston rings are ready. I made it in cast iron GGG60 quality LeZap

There are three different cast iron plates to adapt to the cylinder block. See the difference between "before" and "after" Machining the 4 valves holes is really a stressful job LeZap

Dear all, I need some help to make piston ring for a Corliss steam machine. Why is there an offset between external & internal diameter? How is possible machining the "Z" opening of the ring? Thanks for help LeZap

@ Richard Hed: I bought the castings in 2011, before Coles's stopped business. Drawings are very good except some difficulties to "translate" in metric size. I fully respect the imperial size but I'm working and thinking in decimal-metric. Original drawings are from Eloda Ray in 1946. Cole's...

Inside/ outside 20TPI tread for the cross head barrel. LZ

It's the boss, I'm only the workmen! LeZap