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Abstract

Does the test code BS EN ISO 8662–4: 1995 result in vibration values which adequately represent the vibration magnitudes to which operators are exposed in normal work? And are the measurements sufficient to rate the vibrations of different machines in a way which reflects their relative magnitudes in normal work?

These questions have been addressed by reviewing the available literature, including a recent study of powerful hand-held grinders for the Health & Safety Executive (HSE), and a short series of tests to the standard at Health & Safety Laboratories (HSL), Buxton. And the answers are “No”.

Single axis acceleration measurements are not justified by the literature, and should be replaced by tri-axial measurements.

Single frequency excitation (free-running tests) are justified only if higher frequency components are insignificant (less than 1 ms⁻²). Relevant data is still being analysed.

If single frequency excitation is acceptable, then speed control should have a closer tolerance than ±5%, because of machine resonance effects. A tolerance of ±2% is proposed.

The arrangements for “feed” force application are unsuitable for use with heavy machines. A fixed feed force of 5 kg is proposed.

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References

BS EN 28662–1: (1993) Hand-held portable power tools – Measurement of vibrations at the handle. Part 1. General. BSI, London

BS EN ISO 8662–4: (1995) Hand-held portable power tools – Measurement of vibrations at the handle. Part 4. Grinding machines. BSI, London

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European Grinder Vibration Test Code: A Critical Review

Abstract

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References