The default feeds and speeds should work well.
I’ve had the best success with coated tooling which is also single-flute — this is touched on in:
the other notable considerations are:
- which alloy(s)? Some machine well, 360 brass is described as “free machining” and is the standard for machinability, 6061 alu. is readily available and cuts well, the 5xxx series is gummy and hard to machine, while 7075 is noted as being tough/hard
- does the material work-harden — arguably covered under alloy selection above, but significant enough of a consideration that it merits mentioning
- are your feeds and speeds at the right setting to form a good chip?
- are your toolpaths such that the chipload will be maintained
EDIT: also, if your CAM tool allows it, ramp in (CCPro affords this) or use adaptive/trochoidal tooling.