Further Safety Precautions For Work Procedures Comprising Abrasive Cutting; Emission Levels - Protool WCP 32 Originalbetriebsanleitung

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
Noise level
Uncertainty
Operating noise
Damage to hearing
► Use ear protection!
Vibration emission value a
directions) and uncertainty K measured in accord-
ance with EN 60 745:
Main handle
Auxiliary handle
Uncertainty
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.
11
L
PA
L = 106 dB (A)
WA
CAUTION
(vector sum for three
h
a
h
a
h
K = 1.5 ms
= 95 dB (A)
K = 4 dB
= 3.2 ms
–2
= 3.6 ms
–2
–2