u/Bwyanfwanigan

I need to bore this ball out. It's from a hydraulic steering cylinder for a boat. I gave my customer a cylinder and put the ball they had in it so they could work. As soon as I get this bored out, they are going to switch them out.

So, any ideas on how to hold it in the lathe? It's 1.25 inch bore now, and I need to go to 1.4375.

My current plan is to chuck it up with copper shims and then fasten a piece of plate to the front of the jaws with a hole in it sized so that it presses it towards the chuck.

I think I would have the same workholding problem on my milling machine.