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Hello, Is there any scenario whe

Hello, Is there any scenario whe

Hello, Is there any scenario whe


Is there any scenario where we have to use the cylindrical surface as the datum and not its axis?
I mean to ask if putting the datum on a cylindrical surface is wrong.

RE: Hello, Is there any scenario whe

I'm unsure about this in ASME, but in ISO it could be used for parallelism of the opposite side. Sorry, I don't have anything to share at the moment, except if you check the link -> Link and try to imagine the parallelism (to bottom datum) instead of straighness shown.
A word of caution, please don't rush to throw that on a drawing if measured with CMM. It would require probe system with multiple cylinder probes which is tedious to set-up and cylinder probes usually adds some measurement uncertainty.

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