Stihl TSA 230 Instruction Manual page 62

English
tool. Incorrectly measured tools that are used
cannot be adequately shielded or control‐
led.h)Abrasive wheels and flanges must fit
exactly onto the grinding spindle of your electri‐
cal power tool. Tool bits that do not fit exactly
onto the grinding spindle of the electrical power
tool, rotate unevenly, vibrate a lot and can result
in loss of control.i)Do not use damaged abrasive
wheels. Before each use, check the abrasive
wheels for splitting and cracks. If the electrical
power tool or abrasive wheel falls, check if it is
damaged or use an undamaged abrasive wheel.
Once you have checked the abrasive wheel and
started it, make sure that you and everyone else
nearby remain outside of the area of the rotating
abrasive wheel and allow the machine to run for
a minute at maximum speed. Damaged abrasive
wheels usually break during this test
period.j)Wear personal protective equipment.
Depending on the operation, wear full face pro‐
tection, eye protection or safety glasses. Where
appropriate, wear a dust mask, ear protection,
protective gloves or a special apron that keeps
small ground particles and material particles
away from you. Eyes must be protected against
foreign bodies flying around that occur with cer‐
tain applications. The dust mask or respirator
must filter the dust created during the operation.
If subjected to loud noise for a longer period of
time, you may suffer from loss of hearing.k)Make
sure that other persons keep a safe distance to
your work area. Anyone entering the work area
must wear personal protective equipment. Frag‐
ments from the workpiece or broken tool bits can
fly off and cause injuries even when the person
is outside of the direct work area.l)Hold the
machine only by the insulated handle surfaces
when carrying out work where the tool bit can hit
hidden power lines. Contact with a live line can
also render metal machine parts live and cause
an electric shock.n)Never put the electrical
power tool down before the tool bit has fully stop‐
ped. The rotating tool bit could make contact with
the surface, causing you to loose control of the
electrical power tool.o)Do not leave the electrical
power tool running whilst carrying it. Your cloth‐
ing may get caught in the rotating tool bit and the
tool bit may penetrate your body.p)Clean the
vents of your electrical power tool regularly. The
engine fan attracts dust into the housing and the
large volume of metal dust collected can be an
electrical hazard.q)Do not use the electrical
power tool near combustible materials. Sparks
can ignite these materials.
62
26 General Power Tool Safety Warnings
26.8 8) Additional safety instructions
for abrasive wheel applications
26.8.1 Kickback and associated safety
instructions
Kickback is the sudden reaction as a result of a
catching or blocked rotating abrasive wheel.
Catching and blocking causes the rotating tool bit
to stop abruptly. An uncontrolled electrical power
tool is thereby accelerated against the direction
of rotation of the tool bit at the blockage site.
If for example an abrasive wheel catches or
blocks in the workpiece, the edge of the abrasive
wheel that penetrates the workpiece can be
caught, thereby causing the abrasive wheel to
break away or a kickback. The abrasive wheel
then travels towards or away from the operator
depending on the direction of rotation of the
wheel at the blockage site. Abrasive wheels can
also break in this instance.
A kickback is the result of the incorrect or faulty
use of the electrical power tool. It can be preven‐
ted by taking suitable measures, as described
below.
a)Hold the electrical power tool firmly and make
sure your body and arms are in a position so that
you can catch the kickback forces. Always use
the additional handle, if available, to maintain the
best possible control of kickback forces or reac‐
tive torques during start-up. The operator can
control the kickback and reactive forces by taken
suitable precautions.b)Never place your hand
near the rotating tool bits. The tool bit can move
across your hand in the event of a kick‐
back.c)Avoid the area in front of and behind the
rotating abrasive wheel. The kickback drives the
electrical power tool in a direction that is opposite
to the movement of the abrasive wheel at the
blockage site.d)Work with great care around cor‐
ners, sharp edges, etc. Prevent tool bits of the
workpiece from recoiling and jamming. The rotat‐
ing tool bit tends to jam when it hits corners,
sharp edges or if it ricochets. This results in the
loss of control or kickback.e)Do not use a chain
or toothed saw blade or a segmented diamond
wheel with more than a 10 mm wide slit. Such
tool bits often cause kickback or the loss of con‐
trol of the electrical power tool.f)Avoid the block‐
ing of the abrasive wheel or a surface pressure
that is too high. Do not make cuts that are too
deep. Overloading the abrasive wheel increases
its stress level and the likelihood of skewing or
blocking, and thereby the possibility of a kick‐
back or breakage of the abrasive element.g)If the
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