Ergonomics - Atlas Copco
Ergonomics - Atlas Copco
Ergonomics - Atlas Copco
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emains the same. This loads the muscles of<br />
the upper arm with static forces. Undamped<br />
tools have high vibration values, causing<br />
greater tension of the muscles and increas-<br />
ing the percentage of maximum voluntary<br />
constriction (MVC). Scalers and riveting<br />
hammers require only low or moderate feed<br />
force and, even used for long periods, scal-<br />
ers represent a low level of physical expo-<br />
sure for the operator. As regards riveting<br />
hammers with higher feed forces, the total<br />
exposure per day is less than 20 minutes,<br />
therefore physical exposure is low.<br />
WeiGHt<br />
Tool weight is often a positive factor since it<br />
keeps the vibration value low and contrib-<br />
utes to the feed force. Percussive tools are<br />
moved so slowly that they do not expose the<br />
operator to any dynamic forces.<br />
teMPeratUre<br />
Percussive tools are full-pressure machines.<br />
In other words, there is very little expansion<br />
of the compressed air in the cylinders. There-<br />
fore the temperature of the machine does not<br />
fall low enough to cause operator discomfort.<br />
On the other hand, if a chipping hammer is<br />
used for long periods, the chisel will become<br />
hot to the touch. But, as stated before, the op-<br />
erator should not hold the chisel in any case. Scalers are commonly used in welding operations.<br />
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