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DY6 7JS, Kingswinford, West Midlands, England, United Kingdom
MEASURED VIBRATION LEVELS
Measurements were made cutting pavement quality concrete (45 Nm fibre-mix) 200mm width,
Cutting 250mm depth, approximately 200mm length per minute.
Hand-arm vibration, on the instrument panel, was 2.5 m/s2 (3-axis sum, frequency weighted rms)
Whole-body vibration, on the seat, was 0.45 m/s2 (highest single axis, frequency weighted rms). The machine was operated in normal cutting mode with a depth of 250 mm, and measurements were recorded as it moved forward during continuous cutting (1m in 5 minutes). Measurements were made following the guidance in EN1033:19951 and BS EN 1032:20032. Recording time was restricted to 60 seconds for hand transmitted vibration, and 2 minutes for whole-body vibration.
The magnitude of hand-transmitted vibration typical of the instrument panel was approximately.
2.5 m/s2. This would equate to the Exposure Action Value (EAV) of the EU Physical Agents.
Directive if the operator kept his hands on the panel for 8 hours in a daily shift. Observation of the operator showed that for much of the time he kept his hands in his lap. It is probably unlikely that the EAV for hand vibration would be exceeded in normal use of this machine.
Evaluation of whole-body vibration depends on the highest single axis. The EAV in this case is 0.5 m/s2. An operator who sits on this machine for the whole of an 8- hour shift would be exposed just below the EAV. Evaluation of vibration transmitted to the feet of a seated operator, in terms of any risk to health, is not well supported in the literature. There is some suggestion that a standing operator should be assessed according to the same criteria as one who is sitting. In that case, if the operator of this machine were to stand, his average highest axis vibration of 0.32 m/s2 would be well below the EAV for an 8-hour day.