Starting Operation; Working Advice - Bosch GBS 75 AE Professional Notice Originale

18 | English
Changing the Sanding Belt (see figure A)
– Completely pivot out the clamping lever 3.
The sanding belt 2 is now loose and can be re-
moved.
– Mount the new sanding belt 2. Pay attention
that the direction of the arrows on the inside
of the sanding belt correspond with the arrow
direction on the machine housing.
– Pivot the clamping lever 3 back to its initial
position.
– Pick up the power tool and switch it on. Ad-
just the belt run with adjustment knob 8 until
the edge of the sanding belt runs flush with
the guide plate 13.
Pay attention that the sanding belt 2 does not
move excessively and make contact with the
housing. Check the belt run regularly and read-
just with the adjusment knob 8.
Selecting the Sanding Belt
Depending on the material to be worked and the
required rate of removal, different sanding belts
are available:
For the working of all
wooden materials
For coarse-sanding, e. g.
of rough, unplaned
beams and boards
For face sanding and
planing small irregulari-
ties
For finish and fine sand-
ing of hard woods
2 609 932 599 | (10.10.07)
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Grain size
40 — 240
coarse 40, 60
80, 100,
medium 120
fine 180, 240
Operation

Starting Operation

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 machine, press the On/Off switch 5
and keep it depressed.
To lock the pressed On/Off switch 5, press the
lock-on button 6.
To switch off the machine, release the On/Off
switch 5 or when it is locked with the lock-on but-
ton 6, briefly press the On/Off switch 5 and then
release it.
Preselecting the Belt Speed
The necessary belt speed can be preselected
with the thumbwheel 4, even during operation.
The required belt speed depends on the material
being sanded and on the working conditions, and
can be determined by practical testing.

Working Advice

The sanding removal rate and the surface quality
are mainly determined by the selection of the
sanding belt as well as by the preselected belt
speed. The higher the belt speed, the more mate-
rial is removed and the finer the sanded surface.
Only flawless sanding belts achieve good sanding
capacity and make the machine last longer.
Work using the least possible sanding pressure in
order to increase the service life of the sanding
belts. The machine's own weight is sufficient for a
good sanding performance. An excessive increase
of the sanding pressure does not lead to an in-
crease of the sanding capacity, but to increased
wear of the machine and the sanding belt.
Apply the machine to the workpiece only when
switched on. Work with moderate feed and carry
out the sanding with parallel and overlapping
strokes. Sand in the direction of the grain; sanding
across the grain produces an uneven sanding effect.
Bosch Power Tools