This a fun exercise more than anything else. Do positional tolerances really allow more error than ±? This will give you a sense of perspective when calling up these tolerances.
PositionalTol.pdf (260.8 KB)
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What is the meaning of MMC and MMB?
MMC is Maximum Material Condition. MMB is maximum material boundary. The term MMC is used systematically in ASME Y14.5M-1994. MMB is used systematically in ASME Y14.5-2009. Both terms are used in ASME Y14.5-2018. I am not absolutely sure, but I think MMB is used on FOS datums, and MMC is use on everything else.
Thank you RevDesigner. I would never have guessed in a million years.