Mannesmann 12555-STS350 Instruction Manual page 52

 Do not use any insertion tools that require a liquid cooling agent. Using water or other
liquid cooling agents can lead to electric shock.
Machine kickback and appropriate safety measures
Machine kickback is a sudden reaction resulting from a caught or blocked insertion tool, such as
a grinding or cutting disc, that is in rotation. Catching or blocking leads to an abrupt stoppage of
the rotating insertion tool. This will cause you to lose control of the insertion tool as it
accelerates against the rotational direction at the blocked point.
If, for instance, a grinding disc gets caught or blocked in the work piece, the edge of the grinding
disc that is grinding into the work piece can break off or cause a kickback. The grinding disc will
then move toward or away from the operator, according to the disc's rotational direction at the
blocked point. This may also cause the grinding disc to break.
A kickback is the result of an improper or erroneous use of the device. It can be prevented by
applying safety measures, as described in the following.
 Hold the device tightly and place your body and arms in a position that allows you
absorb the force of a kick-back. Always use the auxiliary handle, if one is provided, in
order to have the highest possible degree of control over the force of kickbacks or
reaction torque at high rotational speeds. With proper safety measures, the operator can
control the force of kickbacks and torque.
 Never put your hands in the vicinity of rotating insertion tools. If a kickback occurs, the
insertion tool may come into contact with your hand.
 Avoid putting your body in the area where the device might be moved in the case of a
kickback. A kickback causes the device to be forced in the direction opposite to the
movement of the grinding disc against the block point.
 Exercise special care when working on corners and sharp edges. Where applicable,
prevent the insertion tool from recoiling and jamming. At corners, sharp edges or when
recoiling, rotating insertion tools have a tendency to jam. This causes a loss of control or a
machine kickback.
 Do not use chain- or toothed saw blades. Such insertion tools often cause kickback or
loss of control over the device.
Special safety guidelines for grinding and cutting
 Use only grinding tools that are approved for your device and protective covers
intended for these grinding tools. Grinding tools that are not intended for the device
cannot be adequately shielded and are unsafe.
 The protective cover must be fastened securely to the device and adjusted so that a
maximum degree of safety can be provided, i.e. the smallest possible part of the
grinding tool should be left open to the operator. The protective cover is meant to protect
the operator from shards and accidental contact with the grinding tool.
 Offset grinding wheels must be mounted in such a way that their grinding areas do
not protrude over the edge of the protective covers. Improperly mounted grinding wheels
that project over the edge of the protective cover are not sufficiently shielded.
 Grinding tools are only to be used for the recommended usages. For example: Never
grind with the lateral surface of a cutting disc. Cutting discs are intended for material
removal with the edge of the disc. Lateral application of force to the grinding tool can break
it.
GB - 13