In article ,
says...
On Wed, 12 May 2004 23:32:38 -0400, Ned Simmons wrote:


A keyless chuck that's worn and/or been greased in the
wrong places may cause problems. The chuck will feel
springy when being tightened and release too easily when
reversed.



Ive pretty much stopped using keyless chucks on my mills when tapping as
it seems they nearly always slip for me.

You can often improve a keyless chuck that releases too
easily. Disassemble and degrease the parts. Check for
burnishing on the conical surface inside the hood where the
jaws ride. Scuff up that surface with crocus if you can see
shiny tracks from the jaws. Relube the parts before
reassembling, but do not get any grease on the inside of
the hood or the mating surface of the jaws.

Ned Simmons