Specifications
22 | English
1 609 929 K42 | (26.2.09) Bosch Power Tools
The grinding tools must run completely concen-
trically. Do not continue to use damaged grind-
ing tools that are out of balance. If the grinding
tools are out of balance they should be re-
placed. Treat with a whetstone (accessory) or
change.
Using a whetstone, any particular special shape
can be produced out of the basic forms of the
grinding accessory.
f Do not tighten the collet chuck of the
clamping nut as long as no grinding acces-
sory is mounted. Otherwise, the collet chuck
can become damaged.
Dust/Chip Extraction
f Dusts from materials such as lead-containing
coatings, some wood types, minerals and
metal can be harmful to one’s health. Touch-
ing or breathing-in the dusts can cause aller-
gic reactions and/or lead to respiratory infec-
tions of the user or bystanders.
Certain dusts, such as oak or beech dust, are
considered as carcinogenic, especially in
connection with wood-treatment additives
(chromate, wood preservative). Materials
containing asbestos may only be worked by
specialists.
– Provide for good ventilation of the work-
ing place.
– It is recommended to wear a P2 filter-
class respirator.
Observe the relevant regulations in your
country for the materials to be worked.
Operation
Starting Operation
f Observe correct mains voltage! The voltage
of the power 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.
Switching On and Off
To start the power tool, push the On/Off switch
5 forwards.
To lock the On/Off switch 5, press the On/Off
switch 5 down at the front until it latches.
To switch off the power tool, release the On/Off
switch 5 or, if it is locked, briefly push down the
back of the On/Off switch 5 and then release it.
f 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.
Constant Electronic Control
(GGS 7 C/GGS 27 LC)
Constant electronic control holds the speed
constant at no-load and under load, and ensures
uniform working performance.
Speed preselection (GGS 7 C/GGS 27 LC)
The required speed can be preselected with the
thumbwheel 6 (also while running).
The required speed depends on the material to
be worked and the diameter of the tool. Deter-
mine the optimum setting through practical
testing.
Thumbwheel
Position
No-load speed (min
-1
)
GGS 7 C GGS 27 LC
1
3100 12000
2
4150 16000
3
5450 21000
4
6200 24000
5
6700 26000
6
7000 27000
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