Dust Extraction; Starting Operation; Working Advice - Bosch GBR Professional 15 CAG Manual Original

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Dust Extraction

 Dust from materials such as lead-containing coatings,
some wood types, minerals and metal can be harmful to
one's health. Touching or breathing-in the dust can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dust, such as oak or beech dust, is considered car-
cinogenic, especially in connection with wood-treatment
additives (chromate, wood preservative). Materials con-
taining asbestos may only be worked by specialists.
– To achieve a high degree of dust extraction, use the
GAS 50 MS vacuum cleaner for mineral dust together
with this power tool.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the
materials to be worked.
 Prevent dust accumulation at the workplace. Dust can
easily ignite.
The vacuum cleaner must be approved for the extraction of
masonry dust. Bosch provides suitable vacuum cleaners.
Insert a vacuum hose 10 (accessory) into the vacuum connec-
tion 8. Connect the vacuum hose 10 to a vacuum cleaner (ac-
cessory). An overview for connecting to a vacuum cleaner can
be found at the end of these 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 cutting discs, concrete
grinders with mounted guard and extraction hood as well
as dust category M vacuum cleaners that are recommend-
ed by Bosch. Other combinations can lead to insufficient
dust collection and separation.
– Observe the operating instructions of the vacuum cleaner
for maintenance and cleaning of the vacuum cleaner, in-
cluding the filter. Empty dust collection containers imme-
diately once full. Clean the filters of the vacuum cleaner
regularly and always insert the filters completely into the
vacuum cleaner.
– Only use vacuum hoses as intended for by Bosch. Do not
manipulate the vacuum hose. When rocks or chunks of
stone/masonry are drawn into the vacuum hose, cease
work and clean the vacuum hose immediately. Prevent the
vacuum hose from being bent or creased.
– Use the concrete grinder only as intended for.
– Observe the general requirements for construction sites.
– Provide for good ventilation.
– Ensure that the work area is clear. When working for ex-
tended periods of time, the vacuum cleaner must be able
to move along freely or at the right time.
– Wear hearing protection, protective goggles, dust mask
and gloves as required. As dust mask, use at least a parti-
cle-filtering class FFP 2 half-mask.
– Use a suitable vacuum cleaner for cleaning the workplace.
Prevent settled dust from being swirled up by sweeping.
Bosch Power Tools
Operation

Starting Operation

 Observe correct mains voltage! The voltage of the pow-
er source must agree with the voltage specified on the
nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.
Switching On and Off
To start the power tool, push the On/Off switch 1 forwards.
To lock the On/Off switch 1, press the On/Off switch 1 down
at the front until it latches.
To switch off the power tool, release the On/Off switch 1 or,
if it is locked, briefly push down the back of the On/Off switch
1 and then release it.
 Check grinding tools before using. The grinding tool
must be mounted properly and be able to move freely.
Carry out a test run for at least one minute with no load.
Do not use damaged, out-of-centre or vibrating grinding
tools. Damaged grinding tools can burst and cause injuries.
To save energy, only switch the power tool on when using it.
Restarting Protection
The restarting protection feature prevents uncontrolled re-
starting of the machine after an interruption in the power sup-
ply.
To restart the operation, switch the On/Off switch 1 to the
Off position and start the machine again.
Note: Check the function of the restarting protection feature
regularly by having the mains plug pulled during operation
and plugged in again afterwards.
Reduced starting current
The electronic reduced starting current limits the power con-
sumption when switching the tool on and enables operation
from a 13 ampere fuse.
Constant Electronic Control
Constant electronic control holds the speed constant at no-
load and under load, and ensures uniform working perfor-
mance.
Overload Protection
When overloaded, the motor comes to a stop. Relieve the load
on the machine immediately and allow to cool down for ap-
prox. 30 seconds at the highest no-load speed.
Sanding close to the edge (GBR 15 CAG) (see figure B)
For grinding close to the edge, slide the locking device 7 for-
wards () and swing the movable part of the guard 6 side-
ways (). Lock the locking device 7 ( ).

Working Advice

 Clamp the workpiece if it does not remain stationary
due to its own weight.
 Do not strain the machine so heavily that it comes to a
standstill.
 Do not touch diamond cup wheels before they have
cooled. Diamond cup wheels become very hot while work-
ing.
English | 19
1 609 92A 2AS | (24.3.16)