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I believe if it is not specified, pitch diameter is used.
In practice, if it is minor diameter (for internal) you will need to gage the diameter with something other than the CMM (gage pin?).
I actually never apply MMC to threaded holes. If it is in tolerance without adding the MMC bonus, great. If not, I note that it is not possible to measure the diameter (it's always pitch diameter here) so it is not possible to report if it is in tolerance.
By 'not possible' I mean that it is not possible for me to measure it with the tools I have at my disposal. Obviously, it is possible for someone, somewhere, with better tools.
I believe if it is not specified, pitch diameter is used.
In practice, if it is minor diameter (for internal) you will need to gage the diameter with something other than the CMM (gage pin?).
I actually never apply MMC to threaded holes. If it is in tolerance without adding the MMC bonus, great. If not, I note that it is not possible to measure the diameter (it's always pitch diameter here) so it is not possible to report if it is in tolerance.
By 'not possible' I mean that it is not possible for me to measure it with the tools I have at my disposal. Obviously, it is possible for someone, somewhere, with better tools.
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