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An evaluation of the standardized chipping hammer test specified in ISO 8662-2
R G Dong1, T W McDowell, D E Welcome
1Engineering & Control Technology Branch, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505, USA. rkd6@cdc.gov
The Annals of Occupational Hygiene
|January 14, 2004
Summary
Testing chipping hammer vibration requires multiple feed forces. The standard ISO 8662-2 may not fully capture tool behavior, impacting hand-arm vibration syndrome prevention.
Area of Science:
- Occupational Health and Safety
- Mechanical Engineering
- Ergonomics
Background:
- Prolonged exposure to chipping hammer vibration can lead to hand-arm vibration syndrome.
- Reliable testing methods are crucial for tool selection and the development of safer chipping hammers.
- The ISO 8662-2 standard provides a method for assessing vibration characteristics.
Purpose of the Study:
- To evaluate the vibration characteristics of chipping hammers using the ISO 8662-2 standard.
- To investigate the influence of different feed forces on vibration emission.
- To assess the repeatability and suitability of the standardized test method.
Main Methods:
- Constructed an energy absorber and test setup according to ISO 8662-2.
- Utilized six subjects, two pneumatic chipping hammers, and three feed forces (50, 100, 200 N).
- Maintained subject posture as specified in the standard.
Main Results:
- Vibration emission at dominant frequency decreased with increased feed force, lowering frequency-weighted accelerations.
- Unweighted high-frequency vibration increased with higher feed forces.
- Chipping hammer vibration emission showed inconsistency at high feed force (200 N).
Conclusions:
- The measurement method demonstrated good repeatability, except at high feed force.
- Feed force significantly impacts vibration emission.
- A single feed force in the standard may be insufficient; multiple levels are recommended for comprehensive tool testing and screening.