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11.
Causes and Operator Prevention of Kickback:
Kickback is a sudden reaction to a pinched, bound or misaligned saw blade,
causing an uncontrolled saw to lift
up
and out of the workpiece toward the
opera tor.
When the blade is pinched or bound tightly by the kerf closing down, the blade
stalls and the motor reaction drives the unit rapidly back toward the operator.
If the blade becomes twisted or misaligned in the cut, the teeth at the back
edge of the blade can dig into the top surface of the wood causing the blade
to climb out
of
the kerf and jump back toward the operator.
Kickback is the result
of
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 saw and position your body and arm in a way
that allows you to resist KICKBACK forces. KICKBACK forces can be
controlled by the operator, if proper precautions are taken.
When blade is binding, or when interrupting a cut for any reason, release
the trigger and hold the saw motionless in the material
until
the blade comes
to a complete stop. Never attempt to remove the saw from the work or pull
the saw backward while the blade is in motion or KICKBACK may occur.
Investigate and take corrective actions to eliminate the cause of blade binding.
When restarting a saw in the workpiece, center the saw blade in the kerf
and check that teeth are not engaged into the material. If 5aw blade is binding,
it
may walk up or KICKBACK from the workpiece as the saw is restarted.
Support large panels to minimize the risk of blade pinching and KICKBACK.
Large panels tend to sag under their own weight. Supports must be placed
under the panel on both sides, near the line of cut and near the edge of the
panel as shown
in
Fig.
1.
To
minimize the risk of blade pinching and kickback. When cutting operation
requires the resting
of
the saw
on
the workpiece, the saw shall be rested on
the larger Dortion and the smaller piece cut off.
To
avoid kickback do support board
or panel near
the
cut.
Don't support board or panel away
I
from
the
cut.
Fig.
1
Fig.
,
5