SENSITIVITY EVALUATION OF THE FULCRUM IN THE 10 N·m DEAD WEIGHT TORQUE STANDARD MACHINE AND PERFORMANCE EXAMINATION OF A 1 N·m TORQUE MEASURING DEVICE

Atsuhiro Nishino, Koji Ogushi, Kazunaga Ueda

Abstract

Many torque tools, such as torque wrenches and torque screwdrivers, as well as torque measuring devices (TMDs) of rated capacity of less than 5 N·m are being used. Thus, a small-rated-capacity torque standard has to be established as soon as possible. To this end, design and development of a dead-weight torque standard machine with a rated capacity of 10 N·m (10 N·m-DWTSM) started in 2006 at the National Metrology Institute of Japan, part of the National Institute of Advanced Industrial Science and Technology. In this report, overviews are given of the 10 N·m-DWTSM and a new 1 N·m TMD developed by way of trial. The sensitivity limit of the fulcrum in the 10 N·m-DWTSM was estimated, and the new 1 N·m TMD was calibrated with the 10 N·m-DWTSM to investigate its characteristics. The fulcrum of the 10 N·m-DWTSM was found to have sufficient sensitivity for two conditions: with the weight loading components only, and with loaded weights. In particular, the sensitivity limit of the fulcrum was a relative value of 5 × 10^-6 for 1 N·m when weights of 200 g were loaded on the weight loading components. Characteristic curves of the new 1 N·m TMD were obtained by calibrating it with the 10 N·m-DWTSM.

Keywords

torque, small-rated-capacity, sensitivity

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IMEKO-WC-2009-TC3-092.pdf

DOI

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IMEKO TC

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

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