Hi Ray,

One way to test the accuracy of your setup is to measure some known standards. Ideally, the standards should mimic the objects that you need to measure. For example, if you're measuring circular features, use plug or ring gages of similar diameters, and probe the same arc segments (this is particularly useful if you're probing less than a full circle or cylinder). If you're measuring linear features, use gage blocks of similar lengths. If you're measuring spherical objects, use a calibration sphere, etc., etc.

If possible, set your standards to the same spatial attitude(s) as the features you need to measure.

By comparing your measured values against the known values, you should be able to get a pretty good idea of the accuracy of your setup. You may be surprised.

Mark Osterstock
Q-Mark Manufacturing Inc.