Bosch GWS 12V-76 Professional Manual Original página 21

Observe the relevant regulations in your country for the ma-
terials to be worked.
Avoid dust accumulation at the workplace. Dust can
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easily ignite.
Operation
Start-up
Switching on/off
To start the power tool, push the on/off switch (3) forward.
To lock the on/off switch (3) in position, push the on/off
switch (3) forward and down until it clicks into place.
To switch off the power tool, release the on/off switch (3);
or, if the switch is locked, briefly push the on/off switch (3)
backward and down and then release it.
Always check abrasive tools before using them. The
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abrasive tool must be fitted properly and be able to
move freely. Carry out a test run for at least one
minute with no load. Do not use abrasive tools that are
damaged, run untrue or vibrate during use. Damaged
abrasive tools can burst apart and cause injuries.
Practical advice
Exercise caution when cutting slots in structural walls;
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see the "Information on structural design" section.
When cutting lightweight materials, take into account
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the statutory provisions and recommendations of the
material manufacturer.
Clamp the workpiece if it is not secure under its own
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weight.
Do not load the power tool so heavily that it comes to a
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stop.
If the power tool has been subjected to a heavy load,
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continue to run it at no-load for several minutes to
cool down the accessory.
Do not use the power tool with a cut-off stand.
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Do not touch grinding and cutting discs until they have
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cooled down. The discs can become very hot while work-
ing.
If the power tool becomes electrostatically charged, the
built-in electronics will switch the power tool off. Press the
on/off switch (3) again to restart the power tool.
Rough grinding
When rough grinding, always use the protective guard
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for grinding (7).
Never use cutting discs for rough grinding.
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When rough grinding, the protective guard for
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cutting (10) can impact the workpiece and lead to a
loss of control.
The best rough grinding results are achieved with a set angle
of 30° to 40°. Move the power tool back and forth with mod-
erate pressure. This will ensure that the workpiece does not
become too hot or discolour and that grooves are not
formed.
Bosch Power Tools
The protective guard for cutting (10) must be used when
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using bonded discs which are approved for cutting and
grinding.
Cutting metal
When cutting, always use the protective guard for
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cutting (10). When using the protective guard for
grinding (7) for cutting work with bonded cutting discs,
there is an increased risk of being exposed to sparks,
particles and disc fragments if the disc breaks.
When carrying out abrasive cutting, use a moderate feed
that is suited to the material being machined. Do not exert
pressure on the cutting disc and do not tilt or swing the
power tool.
Do not attempt to reduce the speed of a cutting disc coming
to a stop by applying pressure from the side.
The power tool must always work in an up-grinding motion.
Otherwise there is a risk that it will be pushed uncontrolled
out of the cut.
For best results when cutting profiles and rectangular
tubing, start at the smallest cross section.
Cutting Stone
When cutting, always use the protective guard for
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cutting (10).
Provide sufficient dust extraction when cutting stone.
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Wear a dust mask.
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The power tool may be used only for dry cutting/grind-
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ing.
For cutting stone, it is best to use a diamond cutting disc.
When cutting especially hard materials such as concrete
with a high pebble content, the diamond cutting disc can
overheat and become damaged as a result. This is clearly in-
dicated by circular sparking, rotating with the diamond cut-
ting disc.
If this happens, stop cutting and allow the diamond cutting
disc to cool down by running the power tool for a short time
at maximum speed with no load.
If work is noticeably slower and circular sparking is present,
this indicates that the diamond cutting disc has become
blunt. You can resharpen the disc by briefly cutting into ab-
rasive material (e.g. lime-sand brick).
Cutting other materials
For cutting materials such as plastic, composite ma-
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terials, etc. with bonded cutting discs or Carbide Multi
Wheel cutting discs, always use the protective guard
for cutting (10).
Information on structural design
Recesses in load-bearing walls are subject to country-spe-
cific regulations. These regulations must be observed under
all circumstances. Seek advice from the responsible struc-
tural engineer, architect or construction supervisor before
starting work.
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1 609 92A 5RF | (28.07.2023)