Manual Bosch PKS 40 (page 20 of 151) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Spanish, Norwegian, Finnish)

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20 | English

1 609 929 N78 | (7.2.08) Bosch Power Tools

f Causes and operator prevention of kick-

back:

– 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 mis-

aligned 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 precau-

tions as given below.

f 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.

f When blade is binding, or when interrupting

a cut for any reason, release the trigger and

hold the saw motionless in the material un-

til the blade comes to a complete stop. Nev-

er 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.

f When restarting a saw in the workpiece,

centre the saw blade in the kerf and check

that saw teeth are not engaged into the ma-

terial. If saw blade is binding, it may walk up

or kickback from the workpiece as the saw is

restarted.

f Support large panels to minimise the risk of

blade pinching and kickback. Large panels

tend to sag under their own weight. Sup-

ports must be placed under the panel on

both sides, near the line of cut and near the

edge of the panel.

f Do not use dull or damaged blades. Un-

sharpened or improperly set blades produce

narrow kerf causing excessive friction, blade

binding and kickback.

f Blade depth and bevel adjusting locking le-

vers must be tight and secure before mak-

ing cut. If blade adjustment shifts while cut-

ting, 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.

f Check lower guard for proper closing be-

fore 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 acci-

dentally 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.

f 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.

f 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.

f 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.

f Use the appropriate riving knife for the

blade being used. For the riving knife to

work, it must be thicker than the body of the

blade but thinner than the tooth set of the

blade.

OBJ_BUCH-179-003.book Page 20 Thursday, February 7, 2008 9:51 AM

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Bosch PKS 40 Manual

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