Starting Operation; Working Advice - Bosch GWS 24-300 Professional Manual Original

OBJ_BUCH-280-004.book Page 18 Monday, February 17, 2014 2:43 PM
18 | English
– 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. Dusts can
easily ignite.
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.
When operating the machine with power from mobile genera-
tors that do not have sufficient reserve capacity or are not
equipped with suitable voltage control with starting current
amplification, loss of performance or untypical behavior can
occur upon switching on.
Please observe the suitability of the power generator being
used, particularly with regard to the mains voltage and fre-
quency.
Switching On and Off
To start the power tool, press the On/Off switch 16 forward
and then down.
To switch off the machine, release the On/Off switch 16.
To save energy, only switch the power tool on when using 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 grind-
ing tools. Damaged grinding tools can burst and cause in-
juries.
Reduced starting current (GWS 24-300 J)
The electronic reduced starting current limits the power con-
sumption when switching the tool on and enables operation
from a 13 ampere fuse.

Working Advice

 Exercise caution when cutting slots in structural walls;
see Section "Information on Structures".
 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.
 After heavily straining the power tool, continue to run
it at no-load for several minutes to cool down the acces-
sory.
 Do not touch grinding and cutting discs before they
have cooled down. The discs can become very hot while
working.
Protect the cutting disc against impact, shock and grease. Do
not subject the cutting disc to lateral pressure.
1 609 92A 0J8 | (17.2.14)
Cutting Metal
 For cutting with bonded abrasives, always use the pro-
tection guard for cutting 6.
When cutting, work with moderate feed, adapted to the mate-
rial being cut. Do not exert pressure onto the cutting disc, tilt
or oscillate the machine.
Do not reduce the speed of running down cutting discs by ap-
plying sideward pressure.
Cutting Stone (see figure A)
 Provide for sufficient dust extraction when cutting
stone.
 The machine may be used only for dry cutting/grinding.
For cutting stone, it is best to use a diamond cutting disc.
Operate the machine only with dust extraction and additional-
ly wear a dust protection mask.
The vacuum cleaner must be approved for the extraction of
masonry dust. Bosch provides suitable vacuum cleaners.
and become damaged as a result. This is clearly indicated by
circular sparking, rotating with the diamond cutting disc.
In this case, interrupt the cutting process and allow the dia-
mond cutting disc to cool by running the machine for a short
time at maximum speed with no load.
Noticeable decreasing work progress and circular sparking
are indications of a diamond cutting disc that has become
dull. Briefly cutting into abrasive material (e. g. lime-sand
brick) can resharpen the disc again.
Information on Structures
Slots in structural walls are subject to the Standard DIN 1053
Part 1, or country-specific regulations.
These regulations are to be observed under all circumstanc-
es. Before beginning work, consult the responsible structural
engineer, architect or the construction supervisor.
The machine must al-
ways work in an up-
grinding motion. Other-
wise, the danger exists
of it being pushed un-
controlled out of the
cut.
When cutting profiles
and square bar, it is best
to start at the smallest
cross section.
Switch on the machine
and place the front part
of the cutting guide on
the workpiece. Slide the
machine with moderate
feed, adapted to the ma-
terial to be worked.
For cutting expecially
hard material, e. g., con-
crete with high pebble
content, the diamond
cutting disc can overheat
Bosch Power Tools