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• Always make sure bystanders are in a safe distance from
the power tool reach zone. All people staying in the vicinity
of the operating power tool must use personal protective
equipment. Chips of a workpiece or broken working tools may
chip off and cause injuries also beyond the direct reach zone.
• When works are performed, during which the power
tool may encounter hidden electric conductors or own
power cord, the power tool should be held by the isolated
surfaces of the handle. A contact with the power mains
network may transfer voltage onto metal parts of the power tool,
which may result in electric shock.
• The power cord must be kept away from the rotating
working tools. When the control over the tool is lost, the power
cord may be cut or caught, and your hand or the entire arm may
get into the rotating working tool.
• Do not put the power tool aside, before the working tool
comes to complete stop. The rotating working tool may come
in contact with a surface, which it is put aside onto, and you may
lose control over the tool.
• Do not carry the power tool, which is in motion. An
accidental contact with the rotating working tool may caught in
your clothes and drill into an operator's body.
• Clean ventilation slots of the power tool on a regular
basis. The motor blower sucks dust into the casing, while large
accumulation of metal dust may cause electric hazard.
• Do not use the power tool near flammable materials. Sparks
may cause ignition.
• Do not use tools, which require liquid cooling agents. The
use of water or other cooling agents may cause electric shocks.
Recoil and proper safety guidelines
• Recoil is a sudden reaction of the power tool to seizure or
blocking of a rotating working tool, such a grinding wheel,
cut-off wheel or a wire brush, etc.
The seizure and blocking may suddenly stop a rotating
working tool. The power tool without control will be jerked in
the opposite direction to the working tool.
When the grinding wheel stops or catches in the workpiece,
an edge od the grinding wheel immersed in the workpiece
may lock and cause recoil or rejection. The movement of the
grinding wheel (towards or away from the operator) depends
on the movement of the grinding wheel in a place, where it is
locked. The grinding wheels may also break.
Recoil is a consequence of incorrect operation of the
power tool. This can be avoided by observing the following
precautions.
• The power tool must be held firmly, while your body
and hands should be positioned to alleviate recoil. If the
additional handle is included as standard equipment, it
should be used at all times to provide the highest control
over recoil forces or rejecting moment during start-up. An
operator can take control of recoil and jerking by taking proper
precautions.
• Never hold your hands in the vicinity of rotating working
tools. A working tool may injure your hand as a result of recoil.
• Always stay away from the reach zone, in which the power
tool moves during recoil. As a result of recoil, the power tool
moves in the opposite direction to the movement of the grinding
wheel, where it locks.
• Corners, sharp edges, etc. should be worked with special
attention. Recoil or locking of the working tools should
be prevented. A rotating working tool is more prone to seizure,
when working angles, corners, sharp edges or when it is rebound.
This may result in loss of control or recoil.
• Do not use discs for wood or toothed discs. Working tools
of this type often cause recoil or loss of control over the working
tool.
Special safety guidelines for grinding and cutting with the
grinding wheel.
• Always use the grinding wheel intended for a given power
tool and guard intended for a given grinding wheel.
Grinding wheel that are not part of equipment of a given power
tool may be insufficiently covered or safe.
• Offset grinding wheels should be fastened so that their
grinding surface does not protrude beyond the protective
guard. Incorrectly seated grinding wheel and protruding beyond
the edge of the protective guard may not be sufficiently covered.
• The guard must be secured to the power tool to ensure the
highest possible safety level and positioned so that the
uncovered part of the grinding wheel facing the operator
is as small as possible. The guard protects the operator against
chips, accidental contact with the grinding wheel and sparks,
which may set clothing on fire.
• Grinding wheels can only be used according to its purpose.
• The side surface of the grinding wheel should not be used
for cutting. Cut-off grinding wheels are designed for removal of
material with the disc edge. The influence of lateral forces on the
grinding wheels may break them.
• Undamaged fastening flanges of a correct size and shape
should always be used for a selected grinding wheel.
Proper flanges support the grinding wheel and reduce the risk of
its breaking. Flanges for cut-off wheels may differ from flanges
designed for other grinding wheels.
• Do not use worn grinding wheels from larger power tools.
Grinding wheels for larger power tools are not designed for
higher rotational speed, which is specific to smaller power tools.
Thus, such grinding wheels may break.
Additional specific safety guidelines for cutting with a cut-
off wheel
• Always prevent a cut-off wheel from seizure and avoid
excessive pressure. Do not make too deep cuts. The
overload of a cut-off wheel increases its load and tendency for
seizure or locking, and thus may result in recoil or breaking of a
cut-off wheel.
• Avoid areas in front of and behind a rotating cut-off wheel.
When a cut-off wheel is moved onto a workpiece away from the
operator, it may cause the power tool to kick back as a result of
recoil, with a rotating cut-off wheel pointing directly towards the
operator.
• When a cut-off wheel seizes or you take a break from
work, switch off the power tool and wait until it comes to a
complete stop. Do not attempt to remove a rotating cut-off
wheel from a cutting place, since it may cause recoil. Find
and eliminate a cause of seizure.
• Do not switch the power tool back on, if it is still sunk in
a workpiece. Before you continue to cut, a cut-off wheel
must reach its full rotational speed. Otherwise, a cut-off
wheel may catch, spring back from a workpiece and cause recoil.
• Boards and large objects should be supported to reduce
the risk of recoil caused by a seized cut-off wheel. Large
objects may bend under their own weight. A workpiece should be
supported from both sides, both near the cut line and its edge.
• Special caution should be exercised, when holes are cut
in a wall or in confined spaces. As a cut-off wheel sinks
into a workpiece, it may cause the power tool to recoil, when it
encounters a gas or water supply line, power conductors or other
objects.
Specific safety guidelines for sanding with sandpaper
• Do not use too large sheets of sandpaper. Always follow
guidelines of a manufacturer, when the size of a sandpaper
is selected. Sandpaper protruding beyond a grinding disc may
cause injuries and result in locking and tearing of sandpaper, or
recoil.
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