Analysis Of Wrist And Hand Torque Strength For Designing A Torque Wrench

Tan, Chen Ming (2020) Analysis Of Wrist And Hand Torque Strength For Designing A Torque Wrench. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The manual operation of the milling machine requires physical strength such as lifting, repeatedly rotating the axis table, tightening and unlocking the drawbar or spindle. The fixed height of the milling machine and the absence of height-adjustable platform greatly affects the operation of the milling process as users might not be able to perform the jobs ergonomically due to mismatch of working level and their height. These work practices which are performed in awkward postures would expose the operators or users to safety issues and ergonomics risk factors. Therefore, the objectives of this study are to quantify the maximum wrist and hand torque of dominant hand at different heights in standing position, design an ergonomic torque wrench for locking and unlocking of milling machine drawbar based on the wrist and hand torque data collected as well as to fabricate and evaluate the effectiveness of the torque wrench prototype. The wrist and hand torque strength of 50 participants were measured using a torque gauge of Mark 10 Series R52 M3i Model. Interview and survey were performed to receive users' perceptions and requirement on the existing torque wrench and through Quality Function Deployment (QFD) and Pugh Concept Selection, obtain and translate the best design concept into engineering drawing in CATIA software and a prototype was fabricated. The result of the wrist and hand torque data collection shows that male generates higher wrist and hand torque compared to female. The maximum wrist torque of male is 4.54 Nm in clockwise torquing direction at shoulder height while for female is 1.92 Nm in anti-clockwise torquing direction. For the maximum hand torque measurement, the result for male and female are I 0.47 Nm and 6.68 Nm respectively in clockwise torquing direction at shoulder height. The RULA analysis on the effectiveness of the design showed that there is a significant improvement in the working posture of the manikin using the redesign torque wrench as compared to the existing one with the reduction of final score from 6 to 3 for left side and 7 to 3 for right side of the manikin.

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