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Bosch GWS 20-230 JH Professional Manual

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English | 21
Bosch Power Tools 1 609 92A 0MJ | (23.4.14)
Approved Grinding Tools
All grinding tools mentioned in these operating instructions
can be used.
The permissible speed [min
-1
] or the circumferential speed
[m/s] of the grinding tools used must at least match the values
given in the table.
Therefore, observe the permissible rotational/circumferen-
tial speed on the label of the grinding tool.
Rotating the Machine Head
Before any work on the machine itself, pull the mains
plug.
The machine head can be
rotated with respect to
the machine housing in
90 ° steps. In this manner,
the On/Off switch can be
brought into a more con-
venient position for spe-
cial working situations,
e. g., for cutting opera-
tions using the cutting
guide with dust extrac-
tion protection guard 24 or for left-handed persons.
Completely unscrew the four screws. Rotate the machine
head carefully, without removing it from the housing, to the
new position. Screw in and tighten the four screws again.
Dust/Chip Extraction
Dusts 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 dusts can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dusts, such as oak or beech dust, are considered
as carcinogenic, especially in connection with wood-treat-
ment additives (chromate, wood preservative). Materials
containing 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 mate-
rials 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 2 forward
and then down.
To lock-on the pressed On/Off switch 2, push the On/Off
switch 2 further forward.
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 grind-
ing tools. Damaged grinding tools can burst and cause in-
juries.
Restarting Protection (GWS 20-230 JH)
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 2 to the
Off position and start the machine again.
Reduced starting current (GWS 20-230 JH)
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”.
max.
[mm]
[mm]
D b d [min
-1
] [m/s]
180
230
8
8
22.2
22.2
8500
6600
80
80
180
230
––
8500
6600
80
80
100 30 M 14 8600 45
b
d
D
D
D
b
d
OBJ_BUCH-1686-003.book Page 21 Wednesday, April 23, 2014 3:36 PM
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