Bosch Professional GBR 15 CAG Original Instructions Manual page 11

– It is advisable to wear a P2 filter class breathing mask.
The regulations on the material being machined that apply in
the country of use must be observed.
Avoid dust accumulation at the workplace. Dust can
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easily ignite.
External dust extraction
The dust extractor must be approved for extracting stone
dust. Suitable dust extractors are available from Bosch.
Connect an extraction hose (10) (accessory) to the extrac-
tion outlet (8). Connect the dust extraction hose (10) to a
dust extractor (accessory). You will find an overview of how
to connect to a dust extractor at the end of these operating
instructions.
Notes for the use of concrete grinders
Please observe the following notes in order to reduce the
dust emissions occurring while working.
– Only use combinations of diamond cup wheels, concrete
grinders with mounted protective guard and extraction
hood as well as dust category M dust extractors that are
recommended by Bosch. Other combinations may lead to
worse collection and separation of dust.
– Observe the operating instructions of the for mainten-
ance and cleaning of the dust extractor, including the fil-
ter. Empty dust collection containers immediately once
full. Clean the dust extractor filters regularly and always
insert the filters completely into the dust extractor.
– Only use the extraction hoses intended by Bosch. Do not
manipulate the extraction hose. If pieces of rock are
drawn into the extraction hose, stop working and clean
the extraction hose immediately. Prevent the extraction
hose from being bent or creased.
– Use the concrete grinder only as intended.
– Observe the general requirements for construction site
workplaces.
– Ensure good ventilation.
– Ensure that the working area is free of obstructions. For
longer jobs, the dust extractor must be guided along in
time, without obstructions in the path.
– Wear hearing protection, protective goggles, dust mask
and gloves as required. Use at least an FFP 2 protection
class particle-filtering half mask.
– Use a suitable vacuum cleaner for cleaning the workplace.
Prevent settled dust from being swirled up by sweeping.
Operation
Starting Operation
Products that are only sold in AUS and NZ: Use a resid-
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ual current device (RCD) with a nominal residual current
of 30 mA or less.
Pay attention to the mains voltage. The voltage of the
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power source must match the voltage specified on the
rating plate of the power tool. Power tools marked
with 230 V can also be operated with 220 V.
Bosch Power Tools
Switching On and Off
To start the power tool, slide the on/off switch (1) forwards.
To lock the on/off switch (1) in position, press the on/off
switch (1) down at the front until it clicks into place.
To switch off the power tool, release the on/off switch (1)
or, if the switch is locked, briefly press the on/off switch (1)
down at the back 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.
Restart protection
The restart protection feature prevents the power tool from
uncontrolled starting after the power supply to it has been
interrupted.
To restart the tool, set the on/off switch (1) to the "off" posi-
tion and then switch the power tool on again.
Note: Check the function of the restart protection feature
regularly by pulling out the mains plug during operation and
then subsequently plugging in again.
Starting current limitation
The electronic starting current limitation feature restricts the
power of the power tool when it is switched on and enables
operation using a 16 A fuse.
Constant Electronic control
The Constant Electronic keeps the speed at no load and un-
der load virtually consistent, guaranteeing uniform perform-
ance.
Overload protection
When overloaded, the motor comes to a stop. Allow the
power tool to cool down unloaded at its maximum no-load
speed for approx. 30 seconds.
Grinding close to edges (see figure B)
GBR 15 CAG
For grinding close to edges, push the lock (7) forwards (➊)
and swivel the movable part of the protective guard (6) side-
ways (➋). Engage the lock (7) (➌).
Working Advice
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.
Do not touch the diamond cup wheel until it has cooled
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down. Diamond cup wheels become very hot whilst work-
ing.
Apply the power tool to the workpiece only when switched
on.
Move the power tool using moderate pressure flat on the
workpiece in a circular motion or alternately along and
across it. For removal of coatings, the power tool can also be
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