TA Operation/Maintenance Instructions Page 18 of 36
8.1 Noise
Noise levels can vary widely from machine to machine depending on conditions of use.
Persons exposed to high noise levels, even for a short time, may experience temporary
partial hearing loss and continuous exposure to high levels can result in permanent
hearing damage. The Woodworking Machines Regulations require employers to take
reasonably practicable measures to reduce noise levels where any person is likely to be
exposed to a continuous equivalent noise level of 90 dB(A) or more over an 8 hour
working day. Additionally, suitable ear protectors must be provided, maintained and
worn.
Machines identified as generating unhealthy noise levels should be appropriately marked
with a warning of the need to wear hearing protection and it may be necessary to
designate particular areas of the workplace as ‘Ear Protection Zones’. Suitable warning
signs are specified in the Safety Signs Regulations Act 1995. It may be necessary to
construct a suitable enclosure, for which professional advice should be sought.
Further information and references to practical guidance are contained in free leaflets
available from The Health & Safety Executive.
Using correctly designed extraction hoods and a compatible system the compound
effect on this machine was to increase the readings by 1dB(A).
The following noise levels were recorded at a distance of one metre from the machine
(operator side) with a 24-tooth anti kick sawblade fitted, using varying feed rates and
depths of cut.
The figures quoted for noise are emission levels and not necessarily safe working levels.
Whilst there is a correlation between emission levels and exposure levels, this cannot be
used reliably to determine whether or not further precautions are required. Factors that
influence the actual level of exposure to the work force include the duration of exposure,
the characteristics of the workroom, the other sources of dust and noise, etc., i.e. the
number of machines and other adjacent processes. Also the permissible exposure levels
can vary from country to country. This information, however, will enable the user of the
machine to make a better evaluation of the hazard and risk.
The list below outlines some of the variables which directly effect the noise level of the
machines:
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