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Re: Double Plus or Minus Tolerance


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Posted By<" ">Randy Kimball on October 28, 2002 at 22:45:27:

In Reply to: Double Plus or Minus Tolerance posted byDavid E. Wagher on October 28, 2002 at 11:56:02:

I agree with Cragyon, why do this ...
The engineer is telling the machinest he wants
a .250 to .230 hole and to please shoot for .240.
A better notation would be .250 +.000/-.020.
Seeing this any self respecting machinest is going
to ream the hole to .240 and play it safe, if it is
a hole. 'or try to mill, grind, or turn to .240.
... it is a bit like when I tell my vendor job shops,
"Please hold my 1/4" holes a few tight so I can fit
ream them at assembly".


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