I'm using a carbide, 3-flute, 60 degree helix end mill. 5/32 cutting diameter w/ a 3/16" shank and 9/16 length of cut. I need to mill 1/2" thick aluminum. what would you reccomend for depth of cut, speed, and feed. It's a Fadal VMC40 with an 8000 rpm spindle. Thanks.