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Comparing three methods for evaluating impact wrench vibration emissions.

Thomas W McDowell1, Pierre Marcotte, Cristopher Warren

  • 1National Institute for Occupational Safety & Health, Health Effects Laboratory Division, 1095 Willowdale Road, Morgantown, WV 26505, USA. TMcDowell@cdc.gov

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Summary
This summary is machine-generated.

This study compared three impact wrench loading devices for vibration measurement. While all devices are suitable for initial screening, laboratory results may not reflect actual workplace conditions for accurate tool selection.

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Area of Science:

  • Occupational health and safety
  • Mechanical engineering
  • Vibration analysis

Background:

  • The international standard ISO 8662-7 provides a method for measuring tool handle vibrations using a specific braking device.
  • To enhance standardization, alternative loading mechanisms involving aluminum blocks and plate-mounted bolts have been developed.
  • Accurate vibration measurement is crucial for tool comparison and assessing workplace risks.

Purpose of the Study:

  • To evaluate three distinct loading mechanisms for impact wrenches and similar tools.
  • To determine the suitability of each loading method for obtaining comparable vibration measurement results.
  • To guide tool evaluators in selecting appropriate loading devices for specific workplace applications.

Main Methods:

  • Six experienced tool operators evaluated five different tool models.
  • The evaluation involved using three distinct loading mechanisms: the standard cotton-phenolic device, aluminum blocks with friction linings, and plate-mounted bolts.
  • Vibration data was collected at the tool handles during operation under each loading condition.

Main Results:

  • Different loading mechanisms produced varying tool comparison results.
  • All three evaluated devices were found adequate for initial tool screening purposes.
  • Laboratory-measured vibration emissions may not fully represent real-world workplace exposures.

Conclusions:

  • The choice of loading mechanism can influence the outcome of tool vibration comparisons.
  • For definitive tool selection and accurate workplace vibration assessment, measurements under actual working conditions are essential.
  • Recommendations are provided regarding the number of tools and operators needed for effective assessment.