Runout Question

I have a shaft with two separate bearing journals that together make up datum A-B.

I measured three separate circles for each journal, constructed cast points at each circle and then used those points to construct a line. I leveled to this line.

My question is, can I set this line to Datum A-B for measuring runouts or do I need to make the actual journal cylinders datum A-B for runouts. Attached is a little sketch.
Thanks in advance.

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louisd over 1 year ago

make sure the strategy of hits & spacing for datum A and datum B are equal to each other.
EX: If datum A has 300 hits and 30 circles, and datum b has 100 hits and 10 circles, your datum axis will be biased to the projection of datum A's axis.
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louisd over 1 year ago

make sure the strategy of hits & spacing for datum A and datum B are equal to each other.
EX: If datum A has 300 hits and 30 circles, and datum b has 100 hits and 10 circles, your datum axis will be biased to the projection of datum A's axis.
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