The influence of target torque and torque build-up time on physical stress in right angle nutrunner operation

摘要

This study used a computer-controlled electric right angle nutrunner to investigate the relative effects of different power hand too, and process parameters on operator muscular exertions, handle stability and subjective ratings of perceived exertion. target torque (25, 40 and 55 Nm), torque build-up time (35, 150, 300, 500 and 900 ms), and workstation orientation (horizontal and vertical) were studied. Dependent variables included EMG activity of the finger flexors, biceps, and triceps, handle velocity and displacement, work don on the tool-hand system and power involved in doing work, subjective ratings of perceived exertion, and task acceptance.