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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.
a) 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 kickback forces, if proper precautions are
taken.
b) 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.
c) Do not attach a toothed saw blade.
Such blades create frequent
kickback and loss of control.
d) 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.
e) 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:
a) 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.