On Tue, 25 Apr 2006 17:02:57 -0700, Harold and Susan Vordos wrote:

Keep the tool sharp, don't let it idle---and don't run too fast.
Stainless work hardens quickly----and what you described is exactly
that---work hardened.
snip

Harold
This is good advice. Learn what work-hardening is - some machinists think
it has something to do with heat-it does not. I would only add that I
think a drill with a fat chisel point is the worst for this type of
stainless because chisel points work-harden the material. Use or make one
with a split point. When tapping, a high pressure lube like Moly-dee is
beneficial, IMHO. Brent.