On 9 Feb 2005 16:15:00 -0800, "Chopster"
wrote:

We are having a problem drilling some 440C stainless steel. Anyway we
are drilling 1/8" holes 1/4" deep. We have been using high speed steel
and been averaging around 75 holes per operation before the drill bit
needed to be changed. However now we are lucky to get 2 or 5 holes
before the drill bit needs to be changed. We had a cobalt drill and
tried it with the same problems. We checked for hardness which we got
Rockwell 35. Which was wierd So we tried file test which was 55-60. I
am thinking that it might be a chromium issue but not sure.

Does anyone have any suggestions on what I might try or what might be
the problem and how I might fix it?

Any suggestion will be helpful!

ask over on alt.machines.cnc.

They will be able to give you chapter and verse.
Btw..there are some point angle geometries which will help out a lot.
And split point is de regure for production 440c

Gunner

Rule #35
"That which does not kill you,
has made a huge tactical error"