Bosch GWS Professional 18 V-LI Manual Original página 30

30 | English
Rotating the machine head
from the power tool before carrying out work on the
power tool (e.g. maintenance, changing tool, etc.). The
battery should also be removed for transport and
storage. There is risk of injury from unintentionally
pressing the on/off switch.
four screws. Rotate the ma-
chine head carefully, without removing it from the
housing, into the new position. Screw in and retighten
the four screws.
Dust/Chip Extraction
Dust 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 dust can
cause allergic reactions and/or lead to respiratory
infections of the user or bystanders.
Certain dust, such as oak or beech dust, is considered
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 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.
 Avoid dust accumulation at the workplace. Dust can
easily ignite.
Operation
Start-up
Inserting the battery
Push the charged battery (5) into the base of the power
tool from the front until the battery is securely locked.
Switching on/off
To start the power tool, push the on/off switch (3)
forward. To lock the on/off switch (3) in position, push
the on/off switch (3) forward and down until it clicks
into place.
To switch off the power tool, release the on/off switch
(3); or, if the switch is locked, briefly push the on/off
switch (3) backward and down and then release it.
 Always check abrasive tools before using them. The
abrasive tool must be fitted properly and be able to
1 609 92A 5C4 | (04.03.2020)
 Remove the battery
Working advice
The machine head can be
rotated in 90°
increments. In this way,
the on/off switch can be
brought into a more
favourable handling
position for particular
applications, e.g. for
lefthanded tool users.
Completely unscrew the
move freely. Carry out a test run for at least one
minute with no load. Do not use abrasive tools that
are damaged, run untrue or vibrate during use.
Damaged abrasive tools can burst apart and cause
injuries.
 Exercise caution when cutting slots in structural
walls; see the "Information on structural design"
section.
Clamp the workpiece if it is not secure under its own

weight.
Do not load the power tool so heavily that it comes

to a stop.
 If the power tool has been subjected to a heavy load,
continue to run it at no-load for several minutes to
cool down the accessory.
 Do not use the power tool with a cut-off stand.
If the power tool becomes electrostatically charged, the
built-in electronics will switch the power tool off. Press
the on/off switch (3) again to restart the power tool.
 Do not touch grinding and cutting discs until they
have cooled down. The discs can become very hot
while working.
Rough grinding Never use cutting discs

for rough grinding.
The best rough grinding results are achieved with a set
angle of 30° to 40°. Move the power tool back and forth
with moderate pressure. This will ensure that the
workpiece does not become too hot or discolour and
that grooves are not 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
temperatures than conventional sanding sheets.
Cutting Metal  Always use the protective guard for
cutting (16) when cutting bonded abrasives.
When carrying out abrasive cutting, use a moderate feed
that is suited to the material being machined. Do not
exert pressure on the cutting disc and do not tilt or
swing the power tool.
Do not attempt to reduce the speed of a cutting disc
coming to a stop by applying pressure from the side. The
power tool must always
work in an up-grinding
motion. Otherwise, there
is a risk that it will be
pushed uncontrolled out
of the cut. For best results
when cutting profiles and
rectangular tubing, start at
the smallest cross section.
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