The only copper I have worked with was 510 alloy. It had a very bad habit of 'gumming' up in the tools. We ended up using a oil based coolant, and machining in small steps to make the parts. We seemed to have most of the problems when the material would get hot, we would make a pass (slot cut) and the material would 'grow' and close up the slot by .01-.015. Try cutting it slow, small steps with plenty of coolant. |