Improvement of Measurement Accuracy of Single Pitch Deviation of Hobbed Gears

(Application of Low-pass Filter to Measurement Data of Tooth Trace)

Abstract

Improving quality of hobbed gears must yield high accuracy of ground gears. This can be achieved by measuring hobbed gears accurately. Pitch deviations are most crucial in grinding processes with a worm type grinder. In the preset study, a new measuring method is proposed for single pitch deviations. In this method, measured helix trace data are conditioned with Gaussian Filter to be divided into short-and long-wavelength components. Single pitch deviations are calculated from the long-wavelength components around the center of facewidth. The calculated deviations showed 62.8% lower variation in iterative measurements.