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The required stroke rate depends on the material

and the working conditions and can be deter-

mined through practical testing.

The constant electronic control keeps the stroke

rate almost constant under no-load or load con-

ditions and ensures a uniform working perform-

ance.

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 scor-

ing 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 sanding plate brake

must be replaced by an authorised after-sales

service agent for Bosch power tools.

Operating Instructions

Wait until the machine has come to a stand-

still before placing it down.

Sanding Surfaces

Switch the machine on, place it with the com-

plete 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 determined by the selection of the sand-

ing sheet, the preselected orbital stroke rate

(GEX 125 AC/GEX 150 AC) and the applied pres-

sure.

Only flawless sanding sheets achieve good sand-

ing capacity and extend the service life of the ma-

chine.

Pay attention to apply uniform sanding pressure;

this increases the working life of the sanding

sheets.

Bosch Power Tools

Intensifiying the sanding pressure does not lead

to an increase of the sanding capacity, but to in-

creased 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 orbital stroke rate

(GEX 125 AC/GEX 150 AC), the sanding plate

stroke rate can be reduced whereby the orbital

action is maintained.

With moderate pressure, move the machine in a

circular pattern 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 AC/GEX 150 AC)

For the polishing of weathered paint or buffing

out scratches (e. g., acrylic glass), the machine

can be equipped with appropriate polishing ac-

cessories such as lamb's wool bonnet, polishing

felt or sponge (accessories).

Select a low stroke rate (setting 1 – 2) for polish-

ing in order to avoid excessive heating of the sur-

face.

Apply polishing agent crosswise or in a circular

motion with a polishing sponge and moderate

pressure, and then allow it to dry lightly.

Polish the partially dried polishing agent with

crosswise or circular motions using a lamb's

wool polishing bonnet.

English | 21

2 609 932 594 | (14.8.07)