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 operator.
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.
b. When the 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 with the material. If the 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. Blade depth and bevel adjusting locking screws must be tight and secure before
making a cut. If blade adjustment shifts while cutting, it may cause binding and
kickback.
f.
Use extra caution when making a "plunge cut" into existing walls or other blind
areas. The protruding blade may cut objects that can cause kickback.
CIRCULAR SAW BLADE SAFETY WARNINGS
a. The maximum speed marked on the tool shall not exceed the maximum speed
marked on the blade.
b. Cracked circular saw blades shall be scrapped (repairing is not permitted).
Composite (tipped) circular saw blades, where the tip dimension is reduced to
less than 1 mm, shall be taken out of service.
c. Fastening screws and nuts shall be tightened using the tools supplied.
d. Clamping surfaces shall be cleaned to remove dirt, grease, oil and water.
e. Do not use loose rings or bushes to "make up" bore sizes on circular saw blades.
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