From: Fred Martin (mung@in-touch.net)
Date: Fri Apr 25 2003 - 12:54:57 PDT
SAE threads...tap drill size = Tap diameter minus 1/N... (N being number
of threads per inch) and you can figure out the size tap drill on the
way to the tool crib, in your head...example...3/4-10...ten into one
goes .100", subtract that from .750 = .650...closest twist drill to that
is .656 or 21/32". Can you tell me how to do it for metrics? Hmmmm! How
about doing it in the lathe? Major diameter - 1.0825 over N = bore
size...Hmmm again. Am I in left field? ...I've opened myself up
here...let 'er rip...I have broad shoulders. Fred Martin
Glen Bedel wrote:
> Compromise for the "UN Coalition" Metric threads with inch heads.....
>
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