A Pitch Tester for Internal Gears : Test Production and Study of Influence of Mechanical Errors on Observed Values of Pitch

Abstract

The authors produced experimentally a pitch tester for internal gears. In this tester, the conventional detector and the indicator of the external gear tester are utilized and a holding and fixing device of internal gears is mainly devised. It is shown by measuring test that the measuring accuracy and the reproducibility of the observed values of pitch are sufficient for practical use. Moreover, the influences of mechanical errors on the value of cumulative pitch error are discussed by the method of statistical analysis and numerical examples. Sufficient practicality of the tester is also shown theoretically and numerically by the analysis and the examples.