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Kickback and related warnings
Kickback is a sudden reaction to a pinched
or snagged rotating wheel, backing pad,
brush or any other accessory. Pinching or
snagging causes rapid stalling of the rotating
accessory which in turn causes the uncon-
trolledpower tool to be forced in the direc-
tion opposite of the accessory's rotation at
the point of the binding.
For example, if an abrasive wheel is snagged
or pinched by the workpiece, the edge of
the wheel that is entering into the pinch
point can dig into the surface of the material
causing the wheel to climb out or kick out.
The wheel may either jump toward or away
from the operator, depending on direction
of the wheel's movement at the point of
pinching. Abrasive wheels may also break
under these conditions.
Kickback is the result of power tool misuse
and/or incorrect operating procedures or
conditions and can be avoided by taking
proper precautions as given below.
Maintain a firm grip on the power tool and
position your body and arm to allow you to
resist kickback forces. Always use auxiliary
handle, if provided, for maximum control
over kickback or torque reaction during
start-up. The operator can control torque
reactions or kickback forces, if proper pre-
cautions are taken.
Never place your hand near the rotating
accessory. Accessory may kickback over
your hand.
Do not position your body in the area where
power tool will move if kickback occurs.
Kickback will propel the tool in direction
opposite to the wheel's movement at the
point of snagging.
Use special care when working corners,
sharp edges, etc. Avoid bouncing and snag-
ging the accessory. Corners, sharp edges or
bouncing have a tendency to snag the rotat-
ing accessory and cause loss of control or
kickback.
Do not attach a saw chain woodcarving
blade or toothed saw blade. Such blades cre-
ate frequent kickback and loss of control
over the power tool.
Safety warnings specific for grinding
and abrasive cutting-off operations
Use only wheel types that are recommended
for your power tool and the specific guard
designed for the selected wheel. Wheels for
which the power tool was not designed can-
not be adequately guarded and are unsafe.
The grinding surface of the centre
depressed wheels must be mounted below
the plane of the guard lip. An improperly
mounted wheel that projects through the
plane of the guard lip cannot be adequately
protected.
The guard must be securely attached to the
power tool and positioned for maximum
safety, so the least amount of wheel is
exposed towards the operator. The guard
helps to protect operator from broken
wheel fragments, accidental contact with
wheel and sparks that could ignite clothing.
Wheels must be used only for recommended
applications. For example: do not grind with
the side of the cut-off wheel. Abrasive cut-
off wheels are intended for peripheral grind-
ing; side forces applied to these wheels may
cause them to shatter.
Always use undamaged wheel flanges that
are of correct size and shape for your
selected wheel. Proper wheel flanges sup-
port the wheel thus reducing the possibility
of wheel breakage. Flanges for cut-off
wheels may be different from grinding
wheel flanges.
Do not use worn down wheels from larger
power tools. Wheels intended for larger
power tools are not suitable for the higher
speed of a smaller tool and may burst.
Additional safety warnings specific
for abrasive cutting off operations
Do not "jam" the cut-off wheel or apply
excessive pressure. Do not attempt to make
an excessive depth of cut. Overstressing the
wheel increases the loading and susceptibil-
ity to twisting or binding of the wheel in the
cut and the possibility of kickback or wheel
breakage.
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