Initial Operation; Maintenance And Cleaning - Bosch GWS 18 U Operating Instructions Manual

Cup Brush 14/Disc brush
The grinding tool must be able to be screwed
onto the grinding spindle 5 until it rests firmly
against the grinder spindle flange at the end of
the grinder spindle threads. Tighten with an
open-ended spanner.
Grinding cup (GWS 21 U)
When working with grinding cups, use a
special guard 10.
The grinding cup 12 should always protrude
from the guard 10 only as far as absolutely nec-
essary for the work to be performed in each case.
Adjust the guard 10 to this distance.
For mounting, see the illustration page.
Screw on the clamping nut 13 and tighten with a
suitable offset two-pin spanner.
Approved Grinding Tools
All sanding tools mentioned in this operating
manual can be used.
The permissible speed [rpm] or the circumferen-
tial speed [m/s] of the grinding tools used must
be at least in accordance with the values given in
the table.
Therefore, always observe the permissible
rotational/circumferential speed on the label
of the grinding tool.
max.
[mm]
D
230
D
d
100
b
D

Initial Operation

Check for correct mains voltage: The voltage
of the power source must agree with the voltage
specified on the nameplate of the machine.
Equipment marked with 230 V can also be con-
nected to 220 V.
Switching on and off
To start the unit, push the On/Off switch 3 for-
wards without pressure on it and press down af-
terwards.
10 • 1 609 929 C78 • TMS • 01.10.01
[mm]
b d [rpm]
– – 6 500
30 M 14 8 500
To lock-on, push the pressed On/Off switch 3
further forwards.
To switch off the machine, release the On/Off
switch 3 or push and release it then.
Switch configuration without lock
(specific countries):
To start the unit, push the On/Off switch 3 for-
wards without pressure on it and press down after-
wards.
To switch off the unit, release the On/Off
switch 3.
Test run!
Check the grinding tool before use. The
grinding tool must be flawlessly mounted
and be able to rotate freely. Perform a test
run of at least 30 seconds without load. Do
not use damaged, out-of-round or vibrating
grinding tools.
Operating Instructions
Do not load the machine so heavily that it
comes to a standstill.
For sanding applications on soft materials, e. g.
gypsum or paint, it is recommended to use the
rubber sanding pad 7 with sanding disc 8.
Cup brushes 14 and wheel brushes are suitable
for rust removal.
Always apply the cup wheel 12 flat and sand flat.
Do not misalign or tilt.
With the flap disc (optional extra), curved surfaces
and profiles (contour sanding) can be worked.
[m/s]
Flap discs have a considerably higher service life
than sanding sheets, lower noise level and lower
80
sanding temperatures.

Maintenance and Cleaning

45
Before any work on the machine itself, pull
the mains plug.
For safe and proper working, always keep
the machine and the ventilation slots clean.
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).
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