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Can we explain the exposure variability found in hand-arm vibrations when using angle grinders? A round robin

I Liljelind¹, J Wahlström, L Nilsson

¹Department of Public Health and Clinical Medicine, Occupational and Environmental Medicine, Umeå University, 901 87, Umeå, Sweden. ingrid.liljelind@envmed.umu.se

International Archives of Occupational and Environmental Health

|December 8, 2009

Summary

The wheel and operator significantly influence hand-arm vibration exposure from angle grinders. Measurements at both throttle and support handles are crucial for accurate hand-arm vibration (HAV) assessment.

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Area of Science:

Occupational health and safety
Ergonomics
Mechanical engineering

Background:

Hand-arm vibration (HAV) exposure is a significant occupational hazard.
Angle grinders are common tools associated with high vibration levels.
Understanding vibration variability is key to mitigating risks.

Purpose of the Study:

To quantify variance components of hand-arm vibration exposure.
To identify factors contributing to vibration variability in angle grinders.
To inform best practices for HAV measurement.

Main Methods:

Laboratory study involving four angle grinders.
Testing conducted across seven laboratories with three operators each.
Vibration measurements taken at throttle and support handles.

Main Results:

The wheel accounted for at least one-third of vibration variability.
Operator influence was less than one-third of total variability.
In repeated tests, wheel, operator, and occasion explained 17%, 29%, and 4% of variability, respectively.

Conclusions:

Significant differences in vibration between handles necessitate measurements at both locations.
Key factors influencing vibration variability include the auto balance unit, wheel, and operator.
Further research is needed to identify additional factors affecting vibration exposure.