Bosch PWS 20-230 J Original Instructions Manual page 22

OBJ_BUCH-2397-003.book Page 22 Monday, June 15, 2015 2:13 PM
22 | English
To switch off the power tool, release the On/Off switch 2, or
when it is locked, briefly press the On/Off switch 2 and then
release it.
To save energy, only switch the power tool on when using it.
Switch Version without Lock-on (country-specific):
To start the power tool, press the On/Off switch 2 forward
and then down.
To switch off the machine, release the On/Off switch 2.
 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.
Restarting Protection (PWS 2000-230 JE)
The restarting protection feature prevents uncontrolled restart-
ing of the machine after an interruption in the power supply.
To restart the operation, switch the On/Off switch 2 to the
Off position and start the machine again.
Reduced starting current (PWS 2000-230 JE/
PWS 20-230 J)
The electronic reduced starting current limits the power con-
sumption when switching the tool on and enables operation
from a 13 ampere fuse.
Note: When the machine runs at full speed immediately after
switching on, the reduced starting current and the restarting
protection have failed. The power tool should be sent imme-
diately to an after-sales service (for addresses, see section
"After-sales Service and Application Service").
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.
 Do not use the power tool with a cut-off stand.
Note: When not using for extended periods, pull the mains
plug out of the socket outlet. When the mains plug is inserted
and mains voltage is given, the power tool, even when
switched off, still consumes a low amount of current.
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.
1 609 92A 1GK | (15.6.15)
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 13.
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.
When cutting profiles and square bar, it is best to start at the
smallest cross section.
Cutting Stone
 Provide for sufficient dust extraction when cutting
stone.
 Wear a dust respirator.
 The machine may be used only for dry cutting/grinding.
For cutting stone, it is best to use a diamond cutting disc.
When using the cutting guide with dust extraction protection
guard 24, the vacuum cleaner must be approved for vacuum-
ing masonry dust. Suitable vacuum cleaners are available
from Bosch.
For cutting especially hard material, e. g., concrete with high
pebble content, the diamond cutting disc can overheat and
become damaged as a result. This is clearly indicated by cir-
cular sparking, rotating with the diamond cutting disc.
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.
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.
Bosch Power Tools