Bosch Professional GEX 125 AVE Manual Original página 18

OBJ_BUCH-1330-003.book Page 17 Wednesday, October 26, 2011 11:52 AM
Preselecting the Orbital Stroke Rate
With the thumbwheel for preselection of the orbital stroke
rate 3, 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.
The power tool is not suitable for stationary operation.
For example, it may not be clamped in a vice or fastened on
a workbench.
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 and the applied pressure.
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.
Bosch Power Tools
Fine Sanding
Attach a sanding sheet with fine grain.
By lightly varying the application pressure or changing the or-
bital stroke rate, 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
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.
Application Table
The data in the following table are recommended values.
The most favourable combination for working is best deter-
mined by practical testing.
Intermediate varnish sanding
Varnish/glaze
Softwood
Hardwood
Veneer
Aluminium
Steel
Derusting steel
Stainless steel
Masonry, stone
English | 17
120/400 5/6
40/80 5/6
40/240 5/6
60/320 5/6
240/320 5/6
80/240 5
60/240 5
40/120 6
120/240 5
80/200 6
2 609 932 821 | (26.10.11)