Hi
Most modern optical CMMs claim to have the ability to measure thread profiles yet I have a problem with that.
A thread is a helix wound around a cylinder and not an annular groove. How are you supposed to see the true form when the workpiece is set flat on a table and the optical path is pointing perpendicular to it?
Shouldn’t you tilt the entire optical path by the helix angle as presented in the picture above to get the true image of a thread?
submitted by /u/Bzdziuchanson
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