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Power Chuck DURO-A
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2.6.6
Dangers due to Power Failure
An unexpected power failure during operation may lead to immediate failure
of the clamping force of the power chuck. The workpiece may then fly out
and cause serious crushing and impact injuries.
To prevent workpieces flying out, ensure perfect functioning of the power
supply before each operation. In addition, the operator and the machine
manufacturer must ensure by means of effective safety equipment that the
actuating and clamping forces are maintained without interruption until the
machine comes to a standstill and the workpiece remains tightly clamped.
2.6.7
Danger of Crushing
The machine manufacturer and/or operator must ensure that all danger to
persons due to unavoidable travel movements is excluded. For this purpose,
2-handed operation, for example, or preferably suitable safety guards can be
used.
If there is a gap of
less than 25 mm
after the distance is travelled, there is
generally a risk of crushing extremities. For this reason,
▪ the speed of movement of components moving towards each other must
generally be reduced to no more than 2 m/min (specification as per
DIN EN ISO 23125). This also applies to
commissioning work,
set-up
mode
and
service work.
▪ or the workpiece loading in normal mode must be carried out either
mechanically or with a ramrod in the case of clamping equipment with
clamping movements.
▪ or the object to be clamped must be fixed with a permanently or tempor-
arily attached workpiece holder (e.g. prism) before the movement is star-
ted.
▪ or, for example, in the case of cylinders and comparable moving com-
ponents, the gap must be covered by a safety guard so as to be inac-
cessible.
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