Operation; Approved Grinding Tools; Dust/Chip Extraction; Rotating The Machine Head - Bosch GWS Professional 20-180 Original Instructions Manual

OBJ_BUCH-721-005.book Page 11 Tuesday, August 30, 2011 2:58 PM
A properly attached, undam-
aged quick-clamping nut can
be loosened by hand when
turning the knurled ring in an-
ticlockwise direction.
Never loosen a tight quick-
clamping nut with pliers. Al-
ways use the two-pin span-
ner. Insert the two-pin span-
ner as shown in the
illustration.

Approved Grinding Tools

All grinding tools mentioned in these operating instructions
can be used.
-1
The permissible speed [min ] 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.
max.
[mm] [mm]
D b
d
180 8 22.2
230 8 22.2
D
b
180
D
–
230
d
100 30 M 14
b
D

Rotating the Machine Head

Before any work on the machine itself, pull the mains
plug.
tion protection guard 22 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.
Bosch Power Tools

Dust/Chip Extraction

Operation

Starting Operation
-1
d [min ] [m/s]
8500 80
6500 80
8500 80
–
6500 80
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
8500 45
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
The machine head can be
and then down.
rotated with respect to
To lock-on the pressed On/Off switch 2, push the On/Off
the machine housing in
switch 2 further forward.
90° steps. In this man-
To switch off the power tool, release the On/Off switch 2, or
ner, the On/Off switch
when it is locked, briefly press the On/Off switch 2 and then
can be brought into a
release it.
more convenient position
Switch Version without Lock-on
for special working situa-
(country-specific):
tions, e. g., for cutting op-
erations using the cutting To start the power tool, press the On/Off switch 2 forward
and then down.
guide with dust extrac-
To switch off the machine, release the On/Off switch 2.
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 suita-
ble 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. Dusts can
easily ignite.
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.
Hold power tool by insulated gripping surfaces 24 and
auxiliary handle 3 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.
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.
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