"Michael Koblic" wrote in message
...

1) What is the expected stiffness of a drill press spindle? Is bending arc
of 0.014" to be expected? What would you expect in a mill? Or a lathe?
2) What are the expected tolerances of drill bits? Is 0.010" out of round
usual?
3) What are the expected tolerances of Jacobs 5/8" chucks? Is 0.010-0.015"
reasonable? I understand that 3-jaw chucks on lathes are not as good at
centering as manually adjusted 4-jaw chucks. Is this about the order of
things?
4) Given that the runout was of the same order throughout the testing
would you say that it is predominantly due to the chuck rather than the
drill bits being out of round?


This seems to be a part of the answer:

http://www.jacobschuck.com/images/pr...%20(ENG)-1.pdf

The question is if the runout would be cured by buying a "name" chuck to
replace the existing People's Liberation Army one...At a cost which almost
equals the drill press as a whole.

BTW has anyone tried the hitting-it-with-the hammer adjustment (as
recommended on a couple of forums)?