Reaction torques and operator stress while using powered nutrunners
✍ Scribed by Andris Freivalds; Jörgen Eklund
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 737 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0003-6870
No coin nor oath required. For personal study only.
✦ Synopsis
Reaction torque measures of six different nutrunners were correlated with EMG measures and subjective ratings of perceived exertion for different work surface orientations, joint stiffnesses, rpm levels, air pressure levels and handle configurations. Using an underpowered tool or using a softer joint resulted in larger impulses and worse ratings. A pulse-type shut-off mechanism produced the lowest reaction torque and the best rating. Overall, ratings correlated directly with the impulse level. The subjects were good judges of stress levels, and subjective ratings were valid measures of operator stress.