Hi
Thanks Nick and Crueby
To continue with the piston rings. The cast iron has been turned internally and externally. I turned a length of steel to a good fit inside and centred and supported with the tail stock.
Part off the waste from the end and then part off a ring 1/16" wide as a test piece.
Try for fit in the cylinder, perfect
Using my DRO, an old set of calipres
Part off as many as I could get
Split each ring with a pair of cutters
carefully open each ring and clip onto a bit of 1/4" square steel and heat up
The ring will fall off on its own and retain the open shape
All done
After a bit of a polish I have 15 rings
And they have a spring tension
The valve chests I am also hacking out solid. " pieces machined to size
Cheers
Rich