mattathayde wrote:
mattathayde had written this in response to
http://rittercnc.com/metalworking/Dr...es-201627-.htm :


-------------------------------------
Michael Koblic wrote:




What is the expected tolerance of drill bits? I have a set of
fractional,
letter and number drills. No.12 to 15 (including 3/16") seem to
produce the
same size hole.


what are you measuring with, 12-15 range .18-.189, also do you have runout
on
your press, how fresh are the bits, etc. your dealing with such small
differences that it will be very hard to get a good read unless you have
very
high quality measuring devices.

-matt


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Any bit not sharpened properly--especially one with the point not
centered will drill oversize..