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@jmorris I've done very little with copper, I just know it has a reputation for being grabby and gummy. Copper and brass generally have a tendency for tools to dig in. Some people regrind drill bits to reduce relief as a result. What you did clearly worked. 🎉

Flycutter geometry is essentially the same as single-point lathe tool geometry. There's an epic thread on Hobby-Machinist that has a lot of information on that geometry. I'm not suggesting you go read 1871 posts, but if at some point you decide you do want to learn more about single point tool geometry, you can ignore the chatter. Somewhere in that thread is buried a document someone did to summarize the thread at that point in time. No idea where though; I didn't bookmark it.

I can attest to the addiction. Awesome that you have a space at work for this!