Working Advice; Maintenance And Service; Maintenance And Cleaning; After-Sales Service And Application Service - Bosch PRR 250 ES Manual Original

16 | English
– To switch off the machine, push the On/Off switch 6 to-
ward the rear so that the "0" is indicated on the switch.
 Check sanding tools before using. The sanding tool
must be mounted properly and be able to move freely.
Carry out a test run for at least one minute with no load.
Do not use damaged, out-of-centre or vibrating sand-
ing tools. Damaged sanding tools can burst and cause in-
juries.
Selecting the Sanding Tool
Choose the sanding tool according to the surface shape and
material you want to sand. Select an appropriate grit for the
desired material removal rate.
Sanding tool Surface shape Grain size
straight
Sanding sleeve
flat
curved
Lamella roll (60 mm)
uneven
Lamella roll
grooved
(10 mm/5 mm)
curved
Flexible sanding wheel
(60 mm/10 mm)
flexible
Shank/sanding sleeve,
conical

Working Advice

The material removal rate and surface quality are primarily de-
termined by the choice of sanding tool, the pre-selected
speed setting and the contact pressure.
Only immaculate sanding tools will deliver good sanding per-
formance and protect the power tool.
Use only original Bosch sanding accessories.
Preselecting the Speed
The required speed can be preselected with the thumbwheel
7 (also while running).
1 –2 low speed
3 –4 medium speed
5 –6 high speed
The required speed depends on the material and the working
conditions and can be determined through practical testing.
The data in the following table are recommended values.
Application Grain Size
(course sanding/
fine sanding)
Roughening varnish
Touching up varnish
Removing varnish
Softwood
Hardwood
Veneer
2 609 007 325 | (30.4.13)
medium 80
fine 120
extra fine 240
medium 80
fine 120
extra fine 240
medium 80
fine 120
medium 80
fine 120
medium 80
fine 120
Speed setting
180/240 2/3
120/240 4/5
40/60
40/240 5/6
60/240 5/6
180/240 2 –4
Application
Aluminium
Steel
Derusting steel
Stainless steel
Masonry, stone
After longer periods of working at low speed, allow the ma-
chine to cool down by running it for approx. 3 minutes at max-
imum speed with no load.
Sanding
– 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.
– Be sure to apply consistent contact pressure, in order to in-
crease the lifetime of the sanding tools.
Excessively increasing the contact pressure will not lead to
increased sanding performance, rather it will cause more
severe wear of the power tool and of the sanding tool.
– Do not use a sanding tool for other materials after it has
been used to work on metal.

Maintenance and Service

Maintenance and Cleaning

 Before any work on the machine itself, pull the mains
plug.
 For safe and proper working, always keep the machine
and ventilation slots clean.
Please store and handle the accessory(-ies) carefully.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.

After-sales Service and Application Service

In all correspondence and spare parts order, please always in-
clude the 10-digit article number given on the type plate of
the machine.
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. Exploded views and information on spare parts can al-
so be found under:
www.bosch-pt.com
Bosch's application service team will gladly answer questions
concerning our products and their accessories.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
5
North Orbital Road
Denham
Uxbridge
UB 9 5HJ
Grain Size Speed setting
(course sanding/
fine sanding)
80/240
40/240
40/120
80/240
80/240
Bosch Power Tools
4/5
5
6
5
5/6