lemel_man wrote:
Dom wrote:

This is driving me crazy. I've tried everything I can think of.
Oh, one other place to look! Worn chuck jaws! Clamp something very round,
hard and free of taper, like a drill bit or end mill shank in the chuck.
See if you can slip a piece of paper between the round and the jaws.
The farther in you can slip the paper, the worse the problem is, as the
jaws are not holding the workpiece all the way out to the tip. That
allows the work to flex.

If you have this problem, you need to re-grind the chuck jaws.
There should be a procedure on file in the Atlas-Craftsman Yahoo group
http://groups.yahoo.com/group/atlas_craftsman/
(Yahoo's ability to search the archives is horrible, though.)

Jon