Instruction Manual

14 | English
Preselecting the orbital stroke rate
You can even preselect the orbital stroke rate during opera-
tion using the necessary orbital stroke rate preselection
thumbwheel (1).
1–2 Low orbital stroke rate
3–4 Medium orbital stroke rate
5–6 High orbital stroke rate
The required orbital stroke rate is dependent on the material
and the work conditions and can be determined using prac-
tical tests.
The Constant Electronic keeps the orbital stroke rate at no
load and under load virtually consistent, guaranteeing uni-
form performance.
After working at a low orbital stoke rate for an extended
period, you should operate the power tool at the maximum
orbital stroke rate for approximately three minutes without
load to cool it down.
Selecting the Material Removal Rate
Two operating modes with different material removal rates
are available. For coarse sanding, push the mode selector
switch (14) forward; for fine sanding, push the mode se-
lector switch (14) backward until you hear it click into place.
u Do not change the operating mode while sanding! This
poses a risk of injury.
Coarse Sanding Operating Mode (Positive Drive Control)
This operating mode has a very high sanding removal rate
and is recommended for machining extremely rough and
non-sensitive surfaces, as well as for rough polishing. The
positive drive control of the sanding pad achieves a consist-
ent eccentric and rotational movement.
Fine Sanding Operating Mode (Free Running)
This operating mode is recommended for handling sensitive
surfaces, as well as for fine polishing. The free running of the
sanding pad achieves a rotational movement that is depend-
ent on the contact pressure with a constant eccentric move-
ment. In addition, the sanding removal rate can be varied by
changing the contact pressure.
Working Advice
u Pull the plug out of the socket before carrying out any
work on the power tool.
u Always wait until the power tool has come to a com-
plete stop before placing it down.
u Do not put the power tool down on its side. This could
permanently warp the sanding pad.
u This power tool is not suitable for bench-mounted use.
It must not be clamped into a vice or fastened to a work-
bench, for example.
Sanding Surfaces
Switch the power tool on, place the entire sanding surface
against the surface of the workpiece and apply moderate
pressure as you move the sander over the workpiece.
The material removal rate and sanding result are primarily
determined by the choice of sanding sheet, the preselected
orbital stroke rate level and the contact pressure.
Only immaculate sanding sheets achieve good sanding per-
formance and make the power tool last longer.
Be sure to apply consistent contact pressure in order to in-
crease the lifetime of the sanding sheets.
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 sheet.
Do not use a sanding sheet for other materials after it has
been used to work on metal.
Use only original Bosch sanding accessories.
Rough Sanding
Attach a coarse grit sanding sheet.
Apply only light pressure to the power tool so that it runs at a
higher orbital stroke rate and a higher material removal rate
is achieved.
Fine Sanding
Attach a fine grit sanding sheet.
You can reduce the sanding plate orbital stroke rate by
lightly varying the contact pressure or changing the orbital
stroke rate level; the random orbit motion will be retained.
Move the power tool with moderate pressure flat on the
workpiece in a circular motion or alternately along and
across it. Do not tilt the power tool in order to avoid sanding
through the workpiece, e.g. veneers.
Switch the power tool off after completing operation.
Polishing
Note: For polishing, you can remove the extraction pipe (3);
this will enable you to handle the tool more easily without
damaging the workpiece.
For polishing weathered lacquers and redressing scratches
(e.g. acrylic glass), the power tool can be fitted with an ap-
propriate polishing tool, e.g. lambswool bonnet, polishing
felt or polishing sponge (accessory).
Select a low orbital stroke rate (level 1–2) when polishing in
order to avoid heating up the surface excessively.
Apply the polish to an area slightly smaller than the area
which you intend to polish. Using the appropriate polishing
tool, work in the polish with either linear or circular move-
ments and with moderate pressure.
Do not allow the polish to dry out on the surface; this may
damage the surface. Do not expose the surface which you in-
tend to polish to direct sunlight.
Clean the polishing tools regularly to ensure good polishing
results. Wash the polishing tools with mild detergent and
warm water; do not use thinning agents.
Clean the extraction outlet (4) regularly; this will ensure per-
fect dust extraction for subsequent grinding applications.
Maintenance and Service
Maintenance and Cleaning
u Pull the plug out of the socket before carrying out any
work on the power tool.
1 609 92A 4CY | (18.02.2019) Bosch Power Tools