Bosch GWS 21-180 H Operating Instructions Manual page 19

When screwing on, take care that the side with
printing does not point to the grinding disc. The
arrow must point to the index mark 28.
28
12
2
2
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.
To lock-on, push the pressed On/Off switch 3
further forwards.
To switch the unit off, 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 af-
terwards.
To switch off the unit, release the On/Off
switch 3.
20 • 1 609 929 C63 • TMS • 25.07.01
Lock the grinder
spindle with the spin-
dle locking button 2.
Tighten the quick
clamping nut by
forcefully turning the
grinding disc in the
clockwise direction.
A properly tightened
undamaged, quick
clamping nut can be
loosened by hand
turning the knurled
ring in the counter-
clockwise direction.
Never loosen a tight
quick clamping nut
with pliers but use a
two-pin spanner. In-
sert the two-hole
spanner as shown in
the illustration.
English - 6
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.
Starting Current Limiting (Type J)
As a result of soft starting, a 13-A fuse is
adequate.
A machine without reduced starting cur-
rent requires higher fuse protection (use
at least a 13 A time-delay fuse).
Operating Instructions
Clamp the workpiece if it does not remain
stationary due to its own weight.
Do not load the machine so heavily that it
comes to a standstill.
Roughing and cutting discs become very
hot while working; do not touch until they
have cooled.
Rough Grinding
With an approach angle of 30° to
40°, the best roughing results can
be achieved. Move the machine
back and forth with moderate pres-
sure. In this manner, the work piece
will not become too hot, does not
discolour and no ridges are formed.
Never use a cutting disc for roughing.
Flap disc
With the flap disc (optional extra), curved sur-
faces and profiles (contour sanding) can be
worked.
Flap discs have a considerably higher service life
than sanding sheets, lower noise level and lower
sanding temperatures.