Optical probing technology on coordinate measuring machines (CMMs) operates significantly differently from discrete point probing associated with tactile probing CMMs hence manufacturers of this technology seek to use different testing artifacts for standardized performance testing. However, the standardized performance metrics which describe the CMMs measurement accuracy need to be comparable to other CMMs regardless of the probing technology. This paper examines several different metrics that can be computed from the test results of CMMs with optical probes and theses metrics are compared for equivalency to the canonical results specified by ISO and ASME standards used for tactile CMMs. A derivation is presented which motivates a more detailed computer simulation study of nine different metrics. Two metrics of these calculated metrics involve easily observable quantities for optical probing systems and are considered equivalent to the canonical performance test value.
Citation: NIST Interagency/Internal Report (NISTIR) - 7883Report Number:
NIST Pub Series: NIST Interagency/Internal Report (NISTIR)
Pub Type: NIST Pubs
coordinate metrology, ISO 10360, dimensional metrology, CMMs, probing