I'm doing a bunch of "engraving" (its really 1/64 deep 2d pocketing) in 5052 H32. With only 4500 rpm my feeds are just painfully slow, are any of you guys doing something similar and do you have any tricks for getting feeds up? I've just started playing but I'm mostly cutting with a 3/32 2 flute end mill and feeding at 3.8ipm