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Item 56932
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 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.
1.
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.
2.
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.
3.
Do not attach a toothed saw blade.
Such blades
create frequent kickback and loss of control.
4.
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.
5.
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:
1.
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.
2.
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.
3.
Do not “jam” a 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 snagging of the wheel in the cut and
the possibility of kickback or wheel breakage.
4.
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 power tool directly at you.
5.
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 corrective action to
eliminate the cause of wheel pinching or snagging.
6.
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.
7.
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.
8.
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.
