Starting Operation; Working Advice - Bosch Professional GEX 125-1 A Manual Original

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16 | English
External Dust Extraction (see figure D)
Attach a vacuum hose 10 onto the outlet piece 8. Connect the
vacuum hose 10 with a vacuum cleaner. An overview for con-
necting to various vacuum cleaners can be found at the begin-
ning of these operating instructions.
The vacuum cleaner must be suitable for the material being
worked.
When vacuuming dry dust that is especially detrimental to
health or carcinogenic, use a special vacuum cleaner.
Operation

Starting Operation

 Observe correct mains voltage! The voltage of the pow-
er 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, tilt the On/Off switch 1 toward the right
to the "I" position.
To switch off the machine, tilt the On/Off switch 1 toward the
left to the "0" position.
To save energy, only switch the power tool on when using it.
Preselecting the Orbital Stroke Rate (GEX 125-1 AE)
With the thumbwheel for preselection of the orbital stroke
rate 2, you can preselect the required orbital stroke rate, even
during operation.
1–2 Low stroke rate
3–4 Medium stroke rate
5–6 High stroke rate
The required stroke rate depends on the material and the
working conditions and can be determined through practical
testing.
After longer periods of working at low stroke rate, allow the
machine to cool down by running it for approx. 3 minutes at
maximum stroke rate with no load.
Sanding Plate Brake
An integrated sanding plate brake reduces the stroke rate
when running at no-load so that scoring is prevented when
placing the machine onto the workpiece.
If the no-load stroke rate continuously increases over the
course of time, then the sanding plate is damaged and must
be replaced or the sanding plate brake is worn. A worn sand-
ing plate brake must be replaced by an authorised after-sales
service agent for Bosch power tools.

Working Advice

 Before any work on the machine itself, pull the mains
plug.
 Wait until the machine has come to a standstill before
placing it down.
For fatigue-free working, the machine can be held from
above, sideways or from the front, depending on the applica-
tion (see figure E).
1 609 92A 0ZY | (27.11.14)
Sanding Surfaces
Switch the machine on, place it with the complete sanding
surface on the surface to be worked and move the machine
with moderate pressure over the workpiece.
The removal capacity and the sanding pattern are mainly de-
termined by the selection of the sanding sheet, the preselect-
ed orbital stroke rate (GEX 125-1 AE) and the applied pres-
sure.
Only flawless sanding sheets achieve good sanding capacity
and extend the service life of the machine.
Pay attention to apply uniform sanding pressure; this increas-
es the working life of the sanding sheets.
Intensifiying the sanding pressure does not lead to an in-
crease of the sanding capacity, but to increased wear of the
machine and the sanding sheet.
A sanding sheet that has been used for metal should not be
used for other materials.
Use only original Bosch sanding accessories.
Rough Sanding
Attach a sanding sheet with coarse grain.
Apply only light pressure to the machine so that it runs at a
higher stroke rate and high material removal is achieved.
Fine Sanding
Attach a sanding sheet with fine grain.
By lightly varying the application pressure or changing the or-
bital stroke rate (GEX 125-1 AE), the sanding plate stroke
rate can be reduced whereby the orbital action is maintained.
With moderate pressure, move the machine in a circular pat-
tern or alternately in lengthwise and crosswise directions
over the workpiece. Do not tilt the machine to avoid sanding
through the workpiece (e. g. when sanding veneer).
After finishing the working procedure, switch the power tool
off.
Polishing (GEX 125-1 AE)
For the polishing of weathered paint or buffing out scratches
(e.g., acrylic glass), the machine can be equipped with appro-
priate polishing accessories such as lamb's wool bonnet, pol-
ishing felt or sponge (accessories).
Select a low stroke rate (setting 1–2) for polishing in order to
avoid excessive heating of the surface.
Apply the polish onto a somewhat smaller surface than you in-
tend to polish. Work the polishing agent in with a suitable pol-
ishing tool applying it crosswise or with circular motion and
moderate pressure.
Do not allow the polishing agent to dry out on the surface, oth-
erwise the surface can become damaged. Do not subject the
surface to be polished to direct sunlight.
Clean the polishing accessories regularly to ensure good pol-
ishing results. Wash out polishing accessories with a mild de-
tergent and warm water; do not use paint thinner.
Bosch Power Tools