Manual Protool WCP50 (page 11 of 90) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Spanish, Norwegian, Finnish)

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5.2 Further safety precautions for

work procedures comprising

abrasive cutting

Kick-back and corresponding warning

The kick-back is a sudden reaction to the rotating

disc getting clamped or blocked. The clamping or

blocking causes the rotating disc to stop suddenly,

which in turn causes the uncontrolled tool at the

point of the seizure to be thrust in the direction

opposite to the disc rotation.

If, for example, the grinding disc is clamped or

blocked inside the work-piece, the disc edge ap-

proaching the point of clamping could cut inside the

material surface and cause the disc to be pushed

up or thrust away. The disc can either jump into

the direction of the operator, or away from the

operator, based on the movement direction of the

disc at the point of seizure. Grinding disc can also

crack in these cases.

The kick-back is the result of incorrect use of the

electromechanical tool, and/or of incorrect work

procedures or conditions, and it can be prevented

by maintaining the safety precautions described

below.

a) The tool must be held ﬁ rmly, and it is nec-

essary to maintain a correct position of

body and arm in order to be able to resist

to kick-back forces. If the tool is equipped

with an auxiliary handle, this must be al-

ways used in order to provide maximum

control over the kick-back or the reactive

torque occurring at machine start-up. The

operator shall be able to control the reactive

torques and kick-back forces if he or she main-

tains the correct safety precautions.

b) The operator must never put hands close

to rotating accessories. Through the impact

of kick-back, the accessories could repulse op-

erator’s hands.

c) The operator must stand so as to keep the

plane of the rotating disc free. The kick-back

thrusts the tool into the direction opposite to the

disc movement direction at the point of seizure.

d) It is necessary to pay special attention to

the processing of corners, sharp edges, etc.

It is necessary to prevent the accessories

to bounce and to get seized. Corners, sharp

edges or bouncing tend to cause the rotating

accessories to get jammed, and to cause loss

of control or kick-back.

e) The tool must not be used with a chain saw

woodcutting disc, with a segmented dia-

mond disc with the perimeter spacing of

its segments being bigger than 10 mm, or

with a toothed saw disc. These discs often

cause kick-back and loss of control.

f) The cutting disc must not be driven into the

material or pushed against with excessive

pressure. Effort to reach excessive depth of

cut must not be exerted. Overloading the disc

increases the load and susceptibility to warping

or jamming of the disc inside the cut, as well as

the possibility of kick-back or disc breakage.

g) If the disc gets jammed or the cutting is

interrupted for any reasons, the electro-

mechanical tool must be turned off and

held stationary until the disc comes to a

complete stop. The operator must never

try to remove the cutting disc out of the

cut if the disc is still moving because this

could result in a kick-back. It is necessary

to inspect the situation and provide remedy in

order to prevent jamming of disc.

h) Cutting inside the work-piece must not be

restarted. The disc is allowed to reach full

speed, and only then it is carefully immersed

into the cut. If the tool is restarted with the

disc being immersed inside the cut, it could get

jammed, pushed up, or a kick-back can occur.

i) Panels an other large work-pieces must

be supported in order to decrease the risk

of disc jamming and of the resulting kick-

back. Large work-pieces tend to warp as the

result of their own weight. Supports must be

placed under the work-piece near the cutting

line, and in the vicinity of the edges of the work-

piece at both sides of the disc.

j) It is necessary to pay special attention

when making a “cut into a cavity” in walls

or other blind areas. The disc coming through

could cut through gas or water pipes, electric

lines, or objects that cause a kick-back.

5.3 Emission levels

Levels determined in accordance with EN 60 745

are typically:

Sound pressure level L

= 94 dB (A)

Noise level L

= 105 dB (A)

Uncertainty K = 3 dB

CAUTION

Operating noise

Damage to hearing

► Use ear protection!

Vibration emission value a

(vector sum for three

directions) and uncertainty K measured in accord-

ance with EN 60 745:

Main handle a

= 4.7 ms

–2

Auxiliary handle a

= 3.9 ms

–2

Uncertainty K = 1.5 ms

–2

Declared total value of vibrations was measured

according to standard measure method and can

be used for comparison one powertools with the

others.

Declared total value of vibrations can be used for

preliminary setting of exposition.

Warning:

Emission of vibrations during real operating can

be different from declared total value of vibrations

depending on speciﬁ c real conditions.

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Protool WCP50 Manual

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