chapter  5
27 Pages

Measurement Strategies of CMM Accuracy

BySalah H. R. Ali

This chapter discusses the coordinate-measuring machine (CMM) fitting software techniques for cylinder roundness measurements, equipped with nine different probe speeds using three detection circles. There are two main types of circle fitting software algorithms used in CMM called Gauss and Chebyshev. The tests have been performed to examine the problem of how to generate reference data sets of measurement strategy for cylinder circle surface at National Institute for Standards (NIS). Dynamic calibration of the CMM stylus system is very important, especially in the field of study CMM accuracy. To make more reliable analysis of the influence of the fitting algorithm and the probe scanning speed on the CMM measurement accuracy, statistical tests should be used. The PRISOM CMM data fitting using the different ways yields a drastically different resulting geometry. The chapter also shows analyses of roundness error of the four fitting techniques in details.