Posted 12/15/2015 22:29 (#4963156 - in reply to #4963125) Subject: RE: Why do drills make a triangle hole instead of round in thin sheetmetal
NW Iowa
I always thought it was because the point of the bit is through the metal before the entire cutting edges are entirely into the hole. The point gives the bit stability but it can't give stability if it isn't anchored. I might be all wet on this one. Hopefully a machinist will set us straight. I use a stepped bit in tin, the hole ends up close to being round and it doesn't grab as bad.
Why do drills make a triangle hole instead of round in thin sheetmetal
