Physical demands associated with right-angle direct-current power-tools: An evaluation of current technology

Area of Science:

• Ergonomics and Human Factors
• Occupational Health and Safety
• Industrial Engineering

Background:

• Power tool operation, particularly with right-angle tools, can impose significant physical demands on operators.
• Understanding the ergonomic implications of different fastening strategies is crucial for preventing musculoskeletal disorders.
• Variability in fastener location, torque requirements, and joint hardness can influence the physical exertion required.

Purpose of the Study:

• To evaluate and compare the physical demands of three direct current (DC) powered right-angle power tool tightening strategies.
• To assess the impact of varying fastener-location-orientations, target torques, and joint hardness on operator physical exertion.
• To identify fastening strategies that offer improved ergonomic benefits for power tool operators.

Main Methods:

• Physical demands were quantified using surface electromyography (EMG) to measure muscle activity.
• Handle forces exerted by operators were recorded.
• Upper body kinematics were analyzed to assess joint movements and overall body posture.

Main Results:

• The TurboTight® strategy, characterized by rapid, short-duration fastening, resulted in lower handle force impulse compared to slower strategies.
• Reduced joint angle displacement was observed with the TurboTight® method.
• Lower EMG magnitudes were recorded for TurboTight®, indicating less muscle strain.

Conclusions:

• The TurboTight® fastening strategy significantly reduces physical demands on power tool operators.
• These ergonomic benefits are consistent across different fastener locations, target torques, and joint hardness levels.
• Implementing TurboTight® offers a practical approach to enhancing operator well-being and reducing the risk of work-related musculoskeletal issues.