Milling at non-optimal rates?

I'm new to milling. I want to mill some brass, which should be very easy, but at 2000 sfm, and a 1/2" mill, I get over 15000 rpm. My machine can't get close to that. I'm using manual feed too.


What is the down side of milling material at a speed considerably slower than the optimum removal rate?

2017-04-11T00:37:33.809Z