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rapid stalling of the rotating accessory which in turn
causes the uncontrolled power tool to be forced in
the direction 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. The operator can control
torque reactions or kickback forces, if proper
precautions are taken.
• Never place your hand near the rotating acces-
sory. 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 snagging the
accessory. Corners, sharp edges or bouncing have
a tendency to snag the rotating accessory and cause
loss of control or kickback.
Do not attach a toothed saw blade. Such blades
•
create frequent kickback and loss of control.
• Always feed the bit into the material in the same
direction as the cutting edge is exiting from the
material (which is the same direction as the chips
are thrown). Feeding the tool in the wrong direction
causes the cutting edge of the bit to climb out of the
work and pull the tool in the direction of this feed.
• When using rotary files, cut-off wheels,
high-speed cutters or tungsten carbide cutters,
always have the work securely clamped. These
wheels will grab if they become slightly canted in
the groove, and can kickback. When a cut-off
wheel grabs, the wheel itself usually breaks. When
a rotary file, high-speed cutter or tungsten carbide
cutter grabs, it may jump from the groove and you
could lose control of the tool.
Safety Warnings Specific for Grinding and
Abrasive Cutting-Off Operations:
Use only wheel types that are recommended
•
for your power tool and only for recommended
applications. For example: do not grind with the
side of a cut-off wheel. Abrasive cut-off wheels are
intended for peripheral grinding, side forces
applied to these wheels may cause them to
shatter.
•
For threaded abrasive cones and plugs use
only undamaged wheel mandrels with an
unrelieved shoulder flange that are of correct
size and length. Proper mandrels will reduce the
possibility of breakage.
• 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 susceptibility to twisting
or binding of the wheel in the cut and the possibility
of kickback or wheel breakage.
• Do not position your hand in line with and behind
the rotating wheel. When the wheel, at the point
of operation, is moving away from your hand, the
possible kickback may propel the spinning wheel
and the spinning wheel directly at you.
•
When wheel is pinched, snagged or when
interrupting a cut for any reason, switch off the
power tool and hold the power tool motionless
until the wheel comes to a complete stop.
Never attempt to remove the cut-off wheel from
the cut while the wheel is in motion otherwise
kickback may occur. Investigate and take correc-
tive action to eliminate the cause of wheel binding.
•
Do not restart the cutting operation in the
workpiece. Let the wheel reach full speed and
carefully re-enter the cut. The wheel may bind,
walk up or kickback if the power tool is restarted in
the workpiece.
• Support panels or any oversized workpiece to
minimize the risk of wheel pinching and kickback.
Large workpieces tend to sag under their own weight.
Supports must be placed under the workpiece near
the line of cut and near the edge of the workpiece
on both sides of the wheel.
• Use extra caution when making a "pocket cut" into
existing walls or other blind areas. The protruding
wheel may cut gas or water pipes, electrical wiring
or objects that can cause kickback.
Additional Safety Warnings
• The arbour size of wheels, sanding drum or any
collet of the power tool. Accessories that do not
match the mounting hardware of the power tool will
run out of balance, vibrate excessively and may
cause loss of control.
• Mandrel mounted wheels, sanding drums, cutters
or other accessories must be fully inserted into
the collet or chuck. The "overhang" or the length
of the mandrel from the wheel to the collet must
be minimal.
and/or the overhang of the wheel is too long, the
mounted wheel may become loose and ejected at
high velocity.
•
After changing the bits or making any adjust-
ments, make sure the collet nut, chuck or any
other adjustment devices are securely tightened.
Loose adjustment devices can unexpectedly shift,
causing loss of control, loose rotating components
will be violently thrown.
To reduce the risk of injury, when
WARNING
working in dusty situations, wear
appropriate respiratory protection or use a
suitable dust extraction solution. To reduce the
risk of injury, when working in dusty situations,
wear appropriate respiratory protection or use
a suitable dust extraction solution.
4
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