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Causes And Operator Prevention Of Kickback - Black & Decker BPSC1607 Original Instructions Manual

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Lower guard may be retracted manually only for
special cuts such as "plunge cuts" and "compound
cuts". Raise lower guard by retracting handle and as
soon as blade enters the material, the lower guard must
be released.
Always observe that the lower guard is covering the
blade before placing saw down on bench or floor.
Cutting procedures
DANGER: Keep hands away from cutting area and
the blade. Keep your second hand on auxiliary
handle, or motor housing.
Do not reach underneath the workpiece.
Adjust the cutting depth to the thickness of the
NEVER hold piece being cut in your hands or across
your leg. It is important to support the work properly to
minimize body exposure, blade binding, or loss of
Hold tool by insulated gripping surfaces when
performing an operation where the cutting tool may
contact hidden wiring or its own cord. Contact with a
"live" wire will also make exposed metal parts of the tool
"live" and shock the operator.
When ripping, always use a rip fence or straight
edge guide. This improves the accuracy of cut and
reduces the chance for blade binding.
Always use blades with correct size and shape
(diamond vs. round) arbor holes. Blades that do not
match the mounting hardware of the saw will run
eccentrically, causing loss of control.
Never use damaged or incorrect blade washers or
bolts. The blade washers and bolt were specially
designed for your saw, for optimum performance and
safety of operation.

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 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 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.
a. Maintain a firm grip with both hands on the saw and
position your body and arm to allow you to resist
KICKBACK forces. Kickback forces can be controlled by
the operator, if proper precautions are taken.
b. 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, center the
saw blade in the kerf and check that the 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 minimize the risk of blade
pinching and KICKBACK. Large panels tend to sag
under their own weight. Support 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 blade. Unsharpened or
improperly set blades produce narrow kerf causing
excessive friction, blade binding, and KICKBACK.
f. Blade depth and bevel adjusting locking levers must
be tight and secure before making cut. If blade
adjustment shifts while cutting, it may cause binding and
g. Use extra caution when making a "Pocket Cut" into
existing walls or other blind areas. The protruding
blade may cut objects that can cause KICKBACK.


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