Manual Bosch GWS 20-230 JH Professional (page 16 of 284) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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English | 17

Bosch Power Tools 1 609 92A 0MJ | (23.4.14)

 Do not operate the power tool near flammable materi-

als. Sparks could ignite these materials.

 Do not use accessories that require liquid coolants. Us-

ing water or other liquid coolants may result in electrocu-

tion or shock.

Kickback and related warnings

 Kickback is a sudden reaction to a pinched or snagged ro-

tating wheel, backing pad, brush or any other accessory.

Pinching or snagging causes rapid stalling of the rotating

accessory which in turn causes the uncontrolled power

tool to be forced in the direction opposite of the accesso-

ry’s rotation at the point of the binding.

For example, if an abrasive wheel is snagged or pinched by

the workpiece, the edge of the wheel that is entering into

the pinch point can dig into the surface of the material

causing the wheel to climb out or kick out. The wheel may

either jump toward or away from the operator, depending

on direction of the wheel’s movement at the point of pinch-

ing. Abrasive wheels may also break under these condi-

tions.

Kickback is the result of power tool misuse and/or incor-

rect operating procedures or conditions and can be avoid-

ed by taking proper precautions as given below.

 Maintain a firm grip on the power tool and position your

body and arm to allow you to resist kickback forces. Al-

ways use auxiliary handle, if provided, for maximum

control over kickback or torque reaction during

start-up. The operator can control torque reactions or

kickback forces, if proper precautions are taken.

 Never place your hand near the rotating accessory.

Accessory may kickback over your hand.

 Do not position your body in the area where power tool

will move if kickback occurs. Kickback will propel the

tool in direction opposite to the wheel’s movement at the

point of snagging.

 Use special care when working corners, sharp edges,

etc. Avoid bouncing and snagging the accessory. Cor-

ners, sharp edges or bouncing have a tendency to snag the

rotating accessory and cause loss of control or kickback.

 Do not attach a saw chain woodcarving blade or

toothed saw blade. Such blades create frequent kickback

and loss of control.

Safety warnings specific for Grinding and Abrasive

Cutting-Off operations

 Use only wheel types that are recommended for your

power tool and the specific guard designed for the se-

lected wheel. Wheels for which the power tool was not de-

signed cannot be adequately guarded and are unsafe.

 The grinding surface of the centre depressed wheels

must be mounted below the plane of the guard lip. An

improperly mounted wheel that projects through the plane

of the guard lip cannot be adequately protected.

 The guard must be securely attached to the power tool

and positioned for maximum safety, so the least

amount of wheel is exposed towards the operator.

The guard helps to protect operator from broken wheel

fragments, accidental contact with wheel and sparks that

could ignite clothing.

 Wheels must be used only for recommended applica-

tions. For example: do not grind with the side of the

cut-off wheel. Abrasive cut-off wheels are intended for

peripheral grinding; side forces applied to these wheels

may cause them to shatter.

 Always use undamaged wheel flanges that are of cor-

rect size and shape for your selected wheel. Proper

wheel flanges support the wheel thus reducing the possi-

bility of wheel breakage. Flanges for cut-off wheels may be

different from grinding wheel flanges.

 Do not use worn down reinforced wheels from larger

power tools. Wheels intended for larger power tools are

not suitable for the higher speed of a smaller tool and may

burst.

Additional safety warnings specific for abrasive cutting

off operations

 Do not “jam” the cut-off wheel or apply excessive pres-

sure. Do not attempt to make an excessive depth of cut.

Overstressing the wheel increases the loading and suscep-

tibility to twisting or binding of the wheel in the cut and the

possibility of kickback or wheel breakage.

 Do not position your body in line with and behind the

rotating wheel. When the wheel, at the point of operation,

is moving away from your body, the possible kickback may

propel the spinning wheel and the power tool directly at

you.

 When wheel is binding or when interrupting a cut for

any reason, switch off the power tool and hold the pow-

er tool motionless until the wheel comes to a complete

stop. Never attempt to remove the cut-off wheel from

the cut while the wheel is in motion otherwise kickback

may occur. Investigate and take corrective action to elimi-

nate the cause of wheel binding.

 Do not restart the cutting operation in the workpiece.

Let the wheel reach full speed and carefully re-enter

the cut. The wheel may bind, walk up or kickback if the

power tool is restarted in the workpiece.

 Support panels or any oversized workpiece to minimize

the risk of wheel pinching and kickback. Large work-

pieces tend to sag under their own weight. Supports must

be placed under the workpiece near the line of cut and near

the edge of the workpiece on both sides of the wheel.

 Use extra caution when making a “pocket cut” into ex-

isting walls or other blind areas. The protruding wheel

may cut gas or water pipes, electrical wiring or objects that

can cause kickback.

Safety warnings specific for sanding operations

 Do not use excessively oversized sanding disc paper.

Follow manufacturers recommendations, when select-

ing sanding paper. Larger sanding paper extending be-

yond the sanding pad presents a laceration hazard and

may cause snagging, tearing of the disc, or kickback.

OBJ_BUCH-1686-003.book Page 17 Wednesday, April 23, 2014 3:36 PM

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Bosch GWS 20-230 JH Professional Manual

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