Working Advice; Maintenance And Service; Maintenance And Cleaning - Bosch GWS Professional 8-115 Original Instructions Manual

40 | en
down the back of the On/Off switch 3 and then
release it.
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.

Working advice

Exercise caution when cutting slots in
structural walls; see Section "Informa-
tion 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 cutting/grind-
ing tool.
Grinding and cutting discs become very
hot while working; do not touch until
they have cooled.
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 machine at an angle of 30° to 40°.
Move the machine back and forth with moder-
ate 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 tem-
peratures than conventional sanding sheets.
Cutting metal
For cutting metal, always work with the
protection guard for cutting 12.
When cutting, work with moderate feed,
adapted to the material being cut. Do not exert
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Operating instructions
pressure onto the cutting disc, tilt or oscillate
the machine.
Do not reduce the speed of running down cut-
ting discs by applying sideward pressure.
Information on Structures
Slots in structural walls are subject to the Stan-
dard DIN 1053 Part 1, or country-specific regu-
lations.
These regulations are to be observed under all
circumstances. Before beginning work, consult
the responsible structural engineer, architect
or the construction supervisor.

Maintenance and service

Maintenance and cleaning

Before any work on the machine itself, pull
the mains plug.
In extreme working conditions, conductive
dust can accumulate in the interior of the
machine when working with metal. The
protective insulation of the machine can be
degraded. The use of a stationary extrac-
tion system is recommended in such cases
as well as frequently blowing out the venti-
lation slots and installing a residual current
device (RCD).
Please store and handle the accessory(-ies)
carefully.
For safe and proper working, always keep the
machine and the ventilation slots clean.
If the machine should fail despite the rigorous
manufacturing and testing procedures, repair
should be carried out by an authorized cus-
tomer services center for BOSCH power tools.
The machine must
always work in an
up-grinding motion.
Otherwise, the dan-
ger exists of it
being pushed
uncontrolled out of
the cut.
When cutting pro-
files and square
bar, it is best to
start at the small-
est cross section.
Robert Bosch Ltda.
03.12.09 14:51:27