THE DEVELOPMENT OF 100 N·m TORQUE STANDARD MACHINE AT NIM

Zhang Zhimin, Zhang Yue, Guo Bin, Meng Feng, Li Tao, Ji Honglei, Dai Ming

Abstract

A set of 100 N&middot;m torque standard machine is newly developed at National Institute of Metrology (NIM). By adapting the air bearing with low friction as the arm lever fulcrum, the low expansion alloy (INVOR) as the arm lever material and the accurate machining and adjustment technology, the uncertainty of 100 N&middot;m torque standard machine is minimized. This machine is capable of realizing torque from 1 N&middot;m to 100 N&middot;m both in clockwise and anticlockwise direction. The working principle and mechanical structure of the machine are introduced, the uncertainty assessment and results of performance test are described. The results show that the repeatability of 100 N&middot;m torque machine is better than 2 × 10^-5 the uncertainty is smaller than 2 × 10^-5 (<i>k</i> = 2).

Keywords

torque standard machine, air bearing, flexible coupling

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IMEKO-WC-2009-TC3-265.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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