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Runout Question

xbigfatgoat
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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Parents
  • Measure datum feature A and datum feature B as individual cylinders (or construct a cylinder from all measured hits). Define your datum as both features and report the runout with respect to the common datum A-B. I'd avoid leveling to the constructed line as a line is interpreted as a 2D feature and will inherit the orientation of your workplane.

    What version of PC-DMIS are you working with?
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  • Measure datum feature A and datum feature B as individual cylinders (or construct a cylinder from all measured hits). Define your datum as both features and report the runout with respect to the common datum A-B. I'd avoid leveling to the constructed line as a line is interpreted as a 2D feature and will inherit the orientation of your workplane.

    What version of PC-DMIS are you working with?
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