Abstract
Modern coordinate measuring machines (CMMs) feature high-precision scanning due to improved mechanics, electronics, control, and software. PTB’s Coordinate Metrology department therefore executed a thorough experimental comparison of the performance of scanning and discrete point probing regarding involute gear calibrations. In the last four years, PTB used scanning and discrete point probing to calibrate 29 different gear geometries covering a wide range of industry-relevant workpieces. Based on these extensive experiments and their analysis regarding measurement results, uncertainty and time, PTB decided to use scanning for gear calibrations in the future while guaranteeing the same measurement uncertainties and the same high level of reliability. This paper comprises an overview of tactile CMM scanning technology, PTB’s gear calibration strategy, the measurement results, measurement uncertainty analyses, and a discussion of the task-specific advantages and challenges of scanning.
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