I have a job that requires 50 holes per part. finish isnt a big deal cause we have to mill .020 out after the drilling. the depth is about .750 deep in alum 6061.
hole ranges are 3/8 7/16 and 1/2
we are running the 1/2" drill at 23.5 inchs per min on a peck cycle to break the chip better at 4500 rpm. which isnt bad except I have over 1000 parts to do with other features on the part. the drill time takes the longest along with spot driling.
What drill breaks chips best with NO Peck drilling and one that will last a while. I was looking at the gurhing(sp) line as we always had good luck with them on incos and stainless, but never tried them on Alum.
We are using precision twist drills cobalt 135º split point stubbies.
any other suggestions for Quality drills.
Delw