Bosch GKS Professional 85 Manual Original página 15

Never hold the workpiece in your hands or across your
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leg while cutting. Secure the workpiece to a stable
platform. It is important to support the work properly to
minimise body exposure, blade binding, or loss of con-
trol.
Hold the power tool by insulated gripping surfaces,
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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
power tool "live" and could give the operator an electric
shock.
When ripping always use a rip fence or straight edge
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guide. This improves the accuracy of cut and reduces the
chance of blade binding.
Always use blades with correct size and shape (dia-
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mond versus round) of arbour holes. Blades that do not
match the mounting hardware of the saw will run off-
centre, causing loss of control.
Never use damaged or incorrect blade washers or
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bolt. The blade washers and bolt were specially designed
for your saw, for optimum performance and safety of op-
eration.
Kickback causes and related warnings
- kickback is a sudden reaction to a pinched, jammed or mis-
aligned saw blade, causing an uncontrolled saw to lift up and
out of the workpiece toward the operator;
- when the blade is pinched or jammed 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 sur-
face 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 operat-
ing procedures or conditions and can be avoided by taking
proper precautions as given below.
Maintain a firm grip with both hands on the saw and
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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.
When blade is binding, or when interrupting a cut for
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any reason, release the trigger and hold the saw mo-
tionless in the material until the blade comes to a com-
plete 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 cor-
rective actions to eliminate the cause of blade binding.
When restarting a saw in the workpiece, centre the
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saw blade in the kerf so that the saw teeth are not en-
gaged into the material. If a saw blade binds, it may walk
up or kickback from the workpiece as the saw is restar-
ted.
Support large panels to minimise the risk of blade
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pinching and kickback. Large panels tend to sag under
Bosch Power Tools
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.
Do not use dull or damaged blades. Unsharpened or im-
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properly set blades produce narrow kerf causing excess-
ive friction, blade binding and kickback.
Blade depth and bevel adjusting locking levers must
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be tight and secure before making the cut. If blade ad-
justment shifts while cutting, it may cause binding and
kickback.
Use extra caution when sawing into existing walls or
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other blind areas. The protruding blade may cut objects
that can cause kickback.
Lower guard function
Check the lower guard for proper closing before each
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use. Do not operate the saw if the lower guard does
not move freely and close instantly. Never clamp or tie
the lower guard into the open position.If the saw is ac-
cidentally dropped, the 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.
Check the operation of the lower guard spring. If the
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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
build-up of debris.
The lower guard may be retracted manually only for
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special cuts such as "plunge cuts" and "compound
cuts". Raise the lower guard by the retracting handle
and as soon as the blade enters the material, the lower
guard must be released.For all other sawing, the lower
guard should operate automatically.
Always observe that the lower guard is covering the
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blade before placing the 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.
Riving knife function
Use the appropriate saw blade for the riving knife. For
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the riving knife to function, the body of the blade must be
thinner than the riving knife and the cutting width of the
blade must be wider than the thickness of the riving knife.
Adjust the riving knife as described in this instruction
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manual. Incorrect spacing, positioning and alignment can
make the riving knife ineffective in preventing kickback.
Always use the riving knife except when plunge cut-
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ting. The riving knife must be replaced after plunge cut-
ting. The riving knife causes interference during plunge
cutting and can create kickback.
For the riving knife to work, it must be engaged in the
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workpiece. The riving knife is ineffective in preventing
kickback during short cuts.
Do not operate the saw if the riving knife is bent. Even
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a light interference can slow the closing rate of a guard.
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1 609 92A 4PY | (22.11.2018)