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

OBJ_BUCH-1833-003.book Page 16 Tuesday, July 5, 2016 2:34 PM
16 | English
To save energy, only switch the power tool on when using
it.
– 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.
Application Surface shape
Sanding wood straight
Removing var-
nish (Wood)
curved
Heavily contoured
Gaps (grooves,
louvres, tongue-
and-groove
joints)
Texturing wood straight
curved
Roughening var- straight
nish (Wood)
Sanding metal straight
(e.g. steel, alu-
minium, brass)
curved
Removing rust straight
from metal
curved
Polishing/tex- straight
turing metal
curved
Removing var- straight
nish (Metal)

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.
1 609 92A 1L8 | (5.7.16)
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
3–4
5–6
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
Sanding tool
Sanding sleeve
Roughening varnish
Conical sanding sleeve
Touching up varnish
Lamella roll (60 mm)
Removing varnish
Flexible sanding wheel
(60 mm/15 mm)
Softwood
Nylon brush
Hardwood
Lamella roll (60 mm)
Veneer
Flap wheel
Aluminium
(10 mm/5 mm)
Steel
Derusting steel
Stainless steel
Nylon brush
Masonry, stone
After longer periods of working at low speed, allow the ma-
Sanding sleeve
chine to cool down by running it for approx. 3 minutes at max-
Conical sanding sleeve
imum speed with no load.
Lamella roll (60 mm)
Sanding
Sanding sleeve
– Switch the machine on, place it with the complete sanding
Conical sanding sleeve
surface on the surface to be worked and move the machine
Sanding fleece
with moderate pressure over the workpiece.
Lamella roll (60 mm)
– Be sure to apply consistent contact pressure, in order to in-
crease the lifetime of the sanding tools.
Nylon brush
Excessively increasing the contact pressure will not lead to
Cleaning disc
increased sanding performance, rather it will cause more
Brass-coated metal
severe wear of the power tool and of the sanding tool.
brush
– Do not use a sanding tool for other materials after it has
Cleaning disc
been used to work on metal.
Brass-coated metal
brush

Maintenance and Service

Nylon brush
Sanding fleece

Maintenance and Cleaning

Nylon brush
 Before any work on the machine itself, pull the mains
Cleaning disc plug.
 For safe and proper working, always keep the machine
and ventilation slots clean.
Please store and handle the accessory(-ies) carefully.
low speed
medium speed
high speed
Grain Size
(course sand-
ing/fine sand-
ing)
180/240
120/240
40/60
40/240
60/240
180/240
80/240
40/240
40/120
80/240
80/240
Speed setting
2/3
4/5
5
5/6
5/6
2–4
4/5
5
6
5
5/6
Bosch Power Tools