Bosch Professional GWS 9-125 P Original Instructions Manual page 11

OBJ_BUCH-3492-002.book Page 11 Friday, February 2, 2018 11:26 AM
Rotating the Machine Head
 Before any work on the machine itself, pull the mains
plug.
machine head carefully, without removing it from the hous-
ing, to the new position. Screw in and tighten the four screws
again.
Dust/Chip 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.
– As far as possible, use a dust extraction system suitable
for the material.
– 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.
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.
 Products sold in AUS and NZ only: Use a residual current
device (RCD) with a rated residual current of 30 mA or
less.
 Hold power tool by insulated gripping surfaces 19 and
auxiliary handle 5 only. The accessory may contact hid-
den wiring or its own cord. Accessory contacting a "live"
wire may make exposed metal parts of the power tool "live"
and shock the operator.
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
Bosch Power Tools
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-
The machine head can be
quency.
rotated with respect to
Switching On and Off
the machine housing in
90° steps. In this man- To save energy, only switch the power tool on when using it.
ner, the On/Off switch
To start the machine, first slide the lock-off button 3 to the
can be brought into a
rear and then push the On/Off switch 2 and keep it pressed.
more convenient posi-
To switch off the machine, release the On/Off switch 2.
tion for special working
 Check grinding tools before using. The grinding tool
situations, e.g. for left-
must be mounted properly and be able to move freely.
handed persons.
Carry out a test run for at least one minute with no load.
Completely unscrew the
Do not use damaged, out-of-centre or vibrating grind-
four screws. Rotate the
ing tools. Damaged grinding tools can burst and cause in-
juries.
Working Advice
 Before any work on the machine itself, pull the mains
plug.
 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.
 Do not use the power tool with a cut-off stand.
Rough Grinding
 Never use a cutting disc for roughing.
The best roughing results are achieved when setting the ma-
chine at an angle of 30° to 40°. Move the machine back and
forth with moderate pressure. In this manner, the workpiece
will not become too hot, does not discolour and no grooves
are formed.
Flap Disc
With the flap disc (accessory), curved surfaces and profiles
can be worked.
Flap discs have a considerably higher service life, lower noise
levels and lower sanding temperatures than conventional
sanding sheets.
Cutting Metal
 For cutting with bonded abrasives, always use the pro-
tection guard for cutting 12.
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.
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1 609 92A 3YG | (2.2.18)