Berner BROS 150-2 Manual Original página 15

The required orbital stroke rate is dependent on
the material and the work conditions and can be
determined using practical tests.
After working at a low orbital stoke rate for an ex-
tended period, you should operate the power tool
at the maximum orbital stroke rate for approxim-
ately three minutes without load to cool it down.
Sanding Plate Brake
English
An integrated sanding pad brake reduces the or-
bital stroke rate when running without load to pre-
vent scoring when the power tool is placed on the
workpiece.
If the no-load orbital stroke rate constantly in-
creases over time, this means that the sanding
pad is damaged and must be replaced, or that the
sanding pad brake is worn. A worn sanding pad
brake must be replaced by an after-sales service
centre authorised to work with Berner power
tools.
Working Advice
English
Pull the plug out of the socket before carry-
u
ing out any work on the power tool.
Always wait until the power tool has come to
u
a complete stop before placing it down.
This power tool is not suitable for bench-
u
mounted use. It must not be clamped into a
vice or fastened to a workbench, for example.
Sanding Surfaces
English
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 performance and make the power tool
last longer.
Be sure to apply consistent contact pressure in or-
der to increase 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.
Application
Intermediate lacquer sanding
Lacquer/varnish
Softwood
Hardwood
1 609 92A 5NP • 20.8.20
Use only original Berner-sanding accessories.
Rough Sanding
English
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
English
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 altern-
ately 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 opera-
tion.
Polishing
English
For polishing weathered lacquers and redressing
scratches (e.g. acrylic glass), the power tool can
be fitted with an appropriate 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 ap-
propriate polishing tool, work in the polish with
either linear or circular movements and with mod-
erate pressure.
Do not allow the polish to dry out on the surface;
this may damage the surface. Do not expose the
surface which you intend to polish to direct sun-
light.
Clean the polishing tool regularly to ensure good
polishing results. Wash the polishing tools with
mild detergent and warm water; do not use thin-
ning agents.
Application Table
English
The information in the table below is the recom-
mended values.
The best method for determining the best com-
bination while sanding or polishing is practical ex-
perimentation.
Grit
(coarse/fine sanding)
120/400
40/80
40/240
60/320
Orbital stroke rate level
5/6
5/6
5/6
5/6
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