Measurement Uncertainty Considerations for Coordinate Measuring Machines

摘要

The report examines some uncertainty considerations for dimensional measurementsperformed on a three axis coordiante measuring machine (CMM). The interaction between measurement uncertainty and part tolerance is briefly presented, and the factors affecting CMM measurements are discussed and their uncertainty described using the approach recommended by the International Committee for Weights and Measures (CIPM). Several of the current technical difficulties which make a rigorous uncertainty evaluation problematic are considered, and some simple examples are presented.