On 2013-04-28, Wild_Bill wrote:
IME, the shanks of HSS drills are typically soft enough to file without
damaging the file.
If the shanks weren't softer, they would be much more difficult to chuck
without slipping, and likely be a lot more instances of broken drills.

Up to a point. Then you get to the import ones which are soft
all the way to the tip, and turn into reverse spirals the first time you
seriously attempt to use them. :-)

The results would be like chucking an endmill, which will work in some
instances, but is generally a bad practice since most drill chuck jaws
aren't treated with diamond dust for adequate gripping power of hard HSS.

With the exception of certain models of Albrecht drill chucks,
which do have the diamond grit for that very purpose. (There may be
others, but the Albrecht are the only ones I know of.)

Enjoy,
DoN.

--
Remove oil spill source from e-mail
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---