I'm new to machining and am running into trouble. I have 70 .076 diameter holes per part in close packing (.025 walls) going down 1 and 1.25 inches in 6061-t6. I'm breaking drills after about 5 holes. Currently running around 4K rpm using a peck cycle with .075 pecks at 8 ipm. I'm rapiding fully out of the hole and returning .02 short of my last depth for continuing with the next peck. I'm using flood coolany on a Fadal. I was using new parabolic drill bits I got from mcmaster. Didn't see any markings on them. Can anyone recommend feeds, speeds, peck sizes, coolants or drill bits to use. Thanks for the help.
Dave