In Reply to Parent Post by carol4832
5). Can a CMM be used? with accuracy levels high enough? does anyone have any recommendations on what can be used?
Yes it can:
What I used to do for quick checks was to obtain measuring probes with spherical tips corresponding to the diameter of the pins in question, and using them instead
of the pins. This method has its limitations however, as you only get a cross section rather than the whole length.
You can also use a CMM to measure the position of the pins in relation to each other: If their relative distance is ok in the cross sections at the ends of the gear, everything is fine.