Coaxial Datum features and their relationship...

[Tenkan]

Question about Coaxial Datum’s and their Features:

What controls the relationship between the two separated cylindrical features that establish the coaxial datum axis? Would the coaxial datum be defined as the simulated axis of the two features regardless of position, if say the two datum features were positioned as far apart as possible within tolerance?


Bonus: can this also apply to a datum center plane established between two separate features? Say using position instead of runout…

reference example attached.


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[fsincox]

pmarc,
Thanks, From my observations, I suspect the reason you find it specifically stated in the newer standards (1994 and on) is most likely because it was not clear in 1982 version (the version we STILL are at) and the committee got in a big argument about it at some time in between.
Frank