PROTOTYPE OF LOAD CELL APPLICATION IN TORQE MEASUREMENT

Tassanai Sanponpute, Chokchai Watthong

Abstract

Torque laboratory of National Institute of Metrology Thailand has designed and developed the prototype of torque transfer wrench and torque wrench calibrator by using load cell as main device in order to provide low cost torque transfer standard. Loading point of load cell was designed to directly connect to torque measurement axle. Moreover, loading point and base of load cell were supported by elastic part acting as flexure bearing. Torque standard machine and commercial torque transfer wrench were used to compare torque measured by the prototypes, torque transfer wrench and torque wrench calibrator respectively. Simulation from finite element analysis confirms that the design can be used as torque measuring device. Metrological properties are investigated according to standard DKD 3-7 and DKD 3-8. The experiment and calibration result shows that uncertainty is within ±0.08% for torque transfer wrench and within ±0.3% for torque wrench calibrator.

Keywords

torque wrench calibrator, torque transfer wrench, load cell

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IMEKO-TC3-2010-034.pdf

DOI

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IMEKO TC

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

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