Author(s)

R.C. Frazer and J. Hu

Abstract

This paper describes the functions of the U.K.'s National Gear Metrology Laboratory (NGML). The parameters which are measured on gears and the equipment which is used to calibrate these parameters are described. Methods of verifying the accuracy of calibration equipment are discussed, with particular reference to the scanning mode of operation used by the equipment. A comparison of calibration results between the European Primary Calibration facility at PTB, Braunschweig Germany and NGML is presented. The results demonstrate that high accuracy calibration data may be obtained from commercially available inspection equipment, if the correct methods of testing are used. 1. Introduction and Background The U.K.'s National Gear Metrology Laboratory (NGML) has been run by Design Un

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