Putting Into Operation; Working Instructions - Bosch PEX 250 AE Operating Instructions Manual

External Vacuuming (see Fig.
(Accessory pages)
Slide the extraction adapter 14 onto the outlet piece 8
and take care that the latching lever engages. For re-
moval, press the latching lever in at the rear and pull off
the extraction adapter.
When sanding vertical surfaces, hold the machine, so
that the extraction hose points downwards.
The vacuum cleaner must be suitable for the material
to be worked.
When vacuuming dry dust that is especially detrimen-
tal to health or carcinogenic, use a special vacuum
cleaner.

Putting into Operation

Ensure that the mains voltage is correct!
The voltage of the power source must agree with the
value given on the nameplate of the machine. Ma-
chines designated for 230 V can also be operated with
220 V.
Switching On/Off
To switch on the machine, press the On-Off switch 2 .
Lock the depressed On-Off switch 2 by pressing the
lock-on button 3 .
To switch off the machine, release the On-Off switch
2 or push and then release it.
Preselect the required speed with the thumbwheel 1
(also while running) (PEX 250 AE/PEX 270 AE).
The required speed is dependent on the material and
can be determined by practical trials.
After longer periods of working at low speed, allow the
machine to cool by running for approx. 3 minutes at
maximum speed with no load.

Working Instructions

Before any work on the machine itself, pull the
I
mains plug.
Sanding Plate Brake
An integrated sanding plate brake reduces the speed
when running at no load so that scoring is avoided
when placing the machine on the work piece.
A continuously increasing no-load speed over the
course of time indicates that the sanding plate brake is
worn and must be replaced by an authorized custom-
er service location for Bosch power tools.
Sanding Surfaces
Place the machine with the complete sanding sheet on
the surface to be worked.
2 609 932 217 • (02.05) T
)
C
English–3
Ensure uniform sanding pressure. Less sanding pres-
sure increases the sanding capacity and protects the
machine and the sanding tool.
The removal capacity and the sanding pattern are de-
termined mainly by the selection of the sanding sheet
(grain size), the speed of the sanding plate and the ap-
plication pressure.
Rough Sanding
Attach a sanding sheet with coarse grain (see Applica-
tion Table).
Apply only light sanding pressure to achieve increased
material removal.
Fine Sanding
Attach a sanding sheet with fine grain (see Application
Table).
With moderate pressure, move the machine in a circu-
lar pattern or alternately in lengthwise and crosswise
directions over the work piece.
Do not tilt the machine to avoid sanding through the
work piece (e.g. when sanding veneer).
After finishing the work, switch off the machine and lift
it from the work piece.
Application Table
The following table should be used only as a recom-
mendation.
The most suitable combination for the work to be per-
formed is best determined by practical trials.
Material
Paint
roughing
Paint touch-up
Paint removal
Softwood
Hardwood
Veneer
Aluminium
Steel
Rust removal from steel
Stainless steel
Grain Thumbwheel
Rough Position
sanding/
Fine
(PEX 250 AE/
sanding
PEX 270 AE)
180/400 2–3
120/240 4–5
40/80 5
60/240 5–6
60/180 5–6
240/320 5
80/240 4–5
60/240 5
40/120 6
120/240 5