Influence Of Changing Way Of The Rotational Mounting Position On Calibration Results Of Reference Torque Wrenches

Koji Ogushi

Abstract

In the calibration of torque measuring devices, measurement is to be repeated by changing the rotational mounting position concerned with the measurement axis as evenly as possible to the direction of rotation because the axi-asymmetric of sensing element and mechanical parts in the transducer contribute to the measurement uncertainty. However, in the calibration of reference torque wrenches, there are some kinds of changing way to change the rotational mounting position. Typical way is to change the angle of detachable square drive parts connected to the front of sensing elements in the transducer of torque wrench form. The other is to change the mounting position of sensing elements themselves. The author investigated to compare the calibration results between two ways for the mounting positions using various transducers. As a result, somewhat large differences of calibration results were occurred between two ways depending on transducers.

Keywords

torque, torque wrench, reference torque wrench, square drive, mounting position

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IMEKO-TC3-2017-040.pdf

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IMEKO TC

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

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