Auxiliary Handle; Starting Operation; Working Advice - Bosch GEX Professional 125 A Originalbetriebsanleitung

OBJ_BUCH-424-004.book Page 16 Tuesday, March 15, 2011 3:24 PM
16 | English
Integrated Dust Extraction with Dust Box
(see figures C1–C4)
Before assembling the dust box 6, pull out the plastic slider
13. Place the dust box 6 onto the extraction outlet 14 and al-
low it to engage. Make sure that the plastic slider 13 engages
in the holder 12.
To empty the dust box 6, press the latching levers 15 on the
side of the dust box ( ). Pull off the dust box toward the bot-
tom ( ).
Before opening the dust box 6, it is recommended to loosen
the dust from the filter element by gently striking it against a
firm support (as shown in the figure).
Grasp the dust box 6 by the recessed grip, fold the filter ele-
ment 16 upward and empty the dust box. Clean the thin
plates of the filter element 16 with a soft brush.
External Dust Extraction (see figure D)
Slide the extraction adapter 17 onto the outlet piece 14. En-
sure that the latching levers of the extraction adapter engage.
The extraction adapter 17 accepts a vacuum hose with a di-
ameter of 19 mm.
For removal of the extraction adapter 17, press the latching
levers together at the rear and pull the extraction adapter off.
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.
Internal Dust Extraction with Dust Bag (see figure E)
For small sanding jobs, a dust bag (accessory) 19 can be con-
nected.
Before mounting the dust bag 19, pull out the plastic slider
13. Slide the dust-bag sleeve firmly over the extraction outlet
14. Pay attention that the plastic slider 13 engages in the
holder intended for it on the dust bag 19.
To maintain optimum dust collection, empty the dust bag 19
in good time.

Auxiliary Handle

The auxiliary handle 1 enables convenient handling and opti-
mal distribution of power, especially at high removal rates.
Fasten the auxiliary handle 1 with screw 2 to the casing.
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, press the On/Off switch 4 and keep it
pressed.
To lock the pressed On/Off switch 4, press the lock-on button 5.
To switch off the machine, release the On/Off switch 4 or
when it is locked with the lock-on button 5, briefly press the
On/Off switch 4 and then release it.
1 609 929 Y19 | (15.3.11)
Preselecting the Orbital Stroke Rate
(GEX 125 AC/GEX 150 AC)
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.
The constant electronic control keeps the stroke rate almost
constant under no-load or load conditions and ensures a uni-
form working performance.
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.
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 AC/GEX 150 AC) and the ap-
plied 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