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Position tolerance with circularity
Hello,
I am designing a circular flange with a fairly large OD. There are two different ID diameters that need to be held as coaxial as possible. Since the wall of the part is somewhat thin, I am calling out free state circularity. In order to hold them coaxially, I was planning on calling out a true position on the 9.254-9.252 diameter back to datum B in the attachment. Is this a good method? My thinking is that even in the free state, the positional callout should maintain the diameters coaxially. In this way, our CMM operator could measure the circularity and positional tolerance in the free state without the complexity of using an inspection fixture to constrain the part. I would not expect the measured positional tolerance to change much in a free state vs a constrained state.