"pogo" wrote in message
...
The bits are slipping in my brand new Craftsman drill press. I love it!
Except for the bits that are slipping. I am tightening the heck out of the
chuck but still the bits slip some. Any hints ? ( All of my bits are a few
years old, and I am a newbie to metal working ... ) This is usually
happening when drilling in aluminum extrusions that tend to grab the bit.

Thanks !



The drill shank also enters into this, on good drills the shank area is soft
and of course the bit area is hard. This allows the chuck jaws to get a grip
on the softer metal.

Jack