Porter-Cable PCC661 Instruction Manual page 4

f) When ripping always use a rip
fence or straight edge guide. This
improves the accuracy of cut and
reduces the chance of blade binding.
g) Always use blades with correct
size and shape (diamond versus
round) of arbour holes. Blades that do
not match the mounting hardware of the
saw will run eccentrically, causing loss
of control.
h) Never use damaged or incorrect
blade washers or bolt. 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 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.
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 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. 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.
f) Blade depth and bevel adjusting
locking knobs must be tight and
secure before making cut. If blade
adjustment shifts while cutting, it may
cause binding and kickback.
g) use extra caution when sawing
into existing walls or other blind
areas. The protruding blade may cut
objects that can cause kickback.
lower Guard Safety
Instructions
a) check lower guard for proper
closing before each use. do not
operate the saw if lower guard does
not move freely and close instantly.
Never clamp or tie the lower guard
into the open position. If saw is
accidentally dropped, lower guard may
be bent. Raise the lower guard with
the retracting handle and make sure it
moves freely and does not touch the
blade or any other part, in all angles and
depths of cut.
b) check the operation of the lower
guard spring. If the guard and the
spring are not operating properly,
they must be serviced before use.
Lower guard may operate sluggishly
due to damaged parts, gummy deposits,
or a buildup of debris.
c) lower guard should 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. For all other sawing, the lower
guard should operate automatically.
d) Always observe that the lower
guard is covering the blade before
placing saw down on bench or floor.
An unprotected, coasting blade will
cause the saw to walk backwards,
cutting whatever is in its path. Be aware
of the time it takes for the blade to stop
after switch is released.
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