when he is milling it, mill at about 50% to 75% as fast as aluminum, the max depth I think he should take is half the diameter, copper is gummy so use plenty of coolant.
Other than that its really not that bad, you just gotta be prepared for it, simply a little smaller chip load and not as deep of cuts.
I have done a lot of 1/16" cuts in copper with lots of success, I dont recall ever breaking an end mill that size.
Jon
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