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– 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 saw misuse and/or incorrect operating
procedures or conditions and can be avoided by taking proper
precautions as given below.
a) Maintain a firm grip with both hands on the saw and position your
arms to resist kickback forces. Position your body to either side of the
blade, but not in line with the blade. Kickback could cause the saw to
jump backwards, but kickback forces can be controlled by the operator, if
proper precautions are taken.
NOTE For circular saws with 140 mm or smaller diameter blades, the
words "with both hands" may be omitted.
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.
c) When restarting a saw in the workpiece, centre the saw blade in the
kerf and check that saw teeth are not engaged into the material. If saw
blade is binding, it may walk up or kickback from the workpiece as the
saw is restarted.
d) Support large panels to minimise 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.
e) Do not use dull or damaged blades. Unsharpened or improperly set
blades produce narrow kerf causing excessive friction, blade binding and
kickback.
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