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I had only ever used cast iron rings in a steam engine up until last year but some of the boys in our model engineering club have been running O-rings for a long time so when I needed new rings of a non-standard size from my 1-1/2" American I made new pistons fitted for O-rings. It is a bit of...

I find it very difficult to visualize in 3D if the part is at all complex, like a cylinder casting with multiple cores/ports, and have to sketch it in multiple sections (slices) to visualize how things relate to each other. I just spent months figuring out how to design a rotary valve for...