1 609 929 N82 | (10.7.08)
Bosch Power Tools
8
| English
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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 in-
correct operating procedures or conditions,
and can be avoided by taking proper precau-
tions as given below.
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Maintain a firm grip with both hands on the
saw and position your arms to resist kick-
back 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 con-
trolled by the operator, if proper precautions
are taken.
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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.
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When restarting a saw in the workpiece, cen-
ter the saw blade in the kerf and check that
saw teeth are not engaged into the material.
If the saw blade is binding, it may walk up or
kickback from the workpiece as the saw is re-
started.
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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.
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Do not use dull or damaged blades.
Unsharp-
ened or improperly set blades produce nar-
row kerf, causing excessive friction, blade
binding and kickback.
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Blade depth and bevel adjusting locking le-
vers must be tight and secure before making
cuts.
If blade adjustment shifts while cutting,
it may cause binding and kickback.
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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.
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Check lower guard for proper closing before
each use. Do not operate the saw if lower
guard does not move freely and close in-
stantly. 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.
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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 slug-
gishly due to damaged parts, gummy depos-
its, or a build-up of debris.
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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 en-
ters the material, the lower guard must be
released.
For all other sawing, the lower
guard should operate automatically.
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Always observe that the lower guard is cov-
ering 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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Do not reach into the saw dust ejector with
your hands.
They could be injured by rotating
parts.
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Do not work overhead with the saw.
In this
manner, you do not have sufficient control
over the power tool.
OBJ_BUCH-692-001.book Page 8 Thursday, July 10, 2008 2:45 PM
