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2: since a large number of the parts I am doing for my current employer are circular parts, this company uses a machine lathe chuck, mounted to the surface plate, with a recalled global alignment done to the tops of an interchangeable pin set. That way, the center of the alignment is ALWAYS at the same exact location, no matter if the part is flipped or not.
We have one of these too, however because we cannot guarantee it is level or the same height once it has been flipped over (we work to very small tolerances), we have to do an alignment again for the Z axis anyway, and so we do the Y and X at the same time too. Our components aren't very heavy, so they can 'float' at different heights in the chuck if not put back exactly the same.
That would be a difference in our parts... Mine are mostly iron castings weighing in excess of 20lbs. Our tolerances aren't huge, but at 50 microns, the weight is pretty good at keeping us in the same general area.
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