Bosch 21 U Betriebsanleitung - Seite 20

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20 | English

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 pinching.

Abrasive wheels may also break under these

conditions.

Kickback is the result of power tool misuse and/or In

correct operating procedures or conditions and can

be avoided by taking proper precautions as given

below.

a) Maintain a firm grip on the power tool and

position your body and arm to allow you to resist

kickback forces. Always 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.

b) Never place your hand near the rotating

accessory. The accessory may kickback over your

hand.

c) Do not position your body in the area where the

power tool will move if kickback occurs. Kickback

will propel the tool in the direction opposite to the

wheel's movement at the point of snagging.

d) Use special care when working corners, sharp

edges, etc. Avoid bouncing and snagging the

accessory. Corners, sharp edges or bouncing have a

tendency to snag the rotating accessory and cause

loss of control or kickback.

e) Do not attach a saw chain woodcarving blade or

toothed saw blade. Such blades create frequent

kickback and loss of control over the power tool.

Safety warnings specific for grinding and

abrasive cutting off operations

a) Always use the guard designed for the type of

wheel you are using. 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 the operator from broken wheel fragments

and accidental contact with the wheel.

b) Use only wheel types that are recommended for

your power tool and the specific guard designed

for the selected wheel. Wheels for which the

power tool was not designed cannot be adequately

guarded and are unsafe.

c) Wheels must be used only for recommended

applications. For example: Do not Grind with the

side of a cut-off wheel. Abrasive cut-off wheels are

intended for peripheral grinding; side forces

applied to these wheels may cause them to

shatter.

d) Always use undamaged wheel flanges that are of

correct size and shape for your selected wheel.

Proper wheel flanges support the wheel thus

reducing the possibility of wheel breakage. Flanges

for cut-off wheels may be different from grinding

F 000 622 213 | 09.2008

wheel flanges.

e) Do not use worn down wheels from larger power

tools. A wheel intended for a larger power tool is

not suitable for the higher speed of a smaller tool

and may burst.

Additional safety warnings specific for

abrasive cutting off operations

a) Do not "jam" the cut-off wheel or apply excessive

pressure. Do not attempt to make An excessive

depth of cut. Overstressing the wheel increases

the loading and susceptibility to twisting or binding

of the wheel in the cut and the possibility of

kickback or wheel breakage.

b) 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.

c) When the wheel is binding or when interrupting a

cut for any reason, switch off the power tool and

hold the power 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

eliminate the cause of wheel binding.

d) 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.

e) Support panels or any oversized workpiece to

minimize the risk of wheel pinching and kickback.

Large workpieces 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.

f) Use extra caution when making a "pocket cut"

into existing 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

a) When sanding, do not use excessively oversized

sanding disc paper. Follow the manufacturers'

recommendations when selecting sanding paper.

Larger sanding paper extending beyond the

sanding pad presents a laceration hazard and may

cause snagging, tearing of the disc, or kickback.

Safety warnings specific for wire brushing

operations

a) Be aware that wire bristles are thrown by the

brush even during ordinary operation. Do not

overstress the wires by applying excessive load

to the brush. The wire bristles can easily penetrate

Robert Bosch Ltda.