Clarke air CAT108, Operating And Maintenance Instructions Manual

Page: 12 / 16

12
VIBRATION EMISSIONS
MODEL No: CAT108 & CAT109
DESCRIPTION: REVERSIBLE RATCHETS
Declared vibration emission value in accordance
with EN12096
Measured vibration emission value - a: less than
2.5m/s 2
Values determined according to EN28622-1
Employers are advised to refer to the HSE publication “Guide for Employers”.
All hand held power tools vibrate to some extent, and this vibration is
transmitted to the operator via the handle, or hand used to steady the tool.
Vibration from about 2 to 1500 herz is potentially damaging and is most
hazardous in the range from about 5 to 20 herz.
Operators who are regularly exposed to vibration may suffer from Hand Arm
Vibration Syndrome (HAVS), which includes ‘dead hand’, ‘dead finger’, and
‘white finger’. These are painful conditions and are widespread in industries
where vibrating tools are used.
The health risk depends upon the vibration level and the length of time of
exposure to it……in effect, a daily vibration dose.
Tools are tested using specialised equipment, to approximate the vibration
level generated under normal, acceptable operating conditions for the tool
in question. For example, a grinder used at 45° on mild steel plate, or a
sander on softwood in a horizontal plane etc.
These tests produce a value ‘a ’ , expressed in metres per second per second,
which represents the average vibration level of all tests taken, in three axes
where necessary, and a second figure ‘K’, which represents the uncertainty
factor, i.e. a value in excess of ‘a’, to which the tool could vibrate under
normal conditions. These values appear in the specification panel below.
HAND-ARM VIBRATION