Berner 201167, Original Instructions Manual

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English | 23
1 609 92A 1D1 • 12.8.15
Note: When not using for extended periods, pull
the mains plug out of the socket outlet. When the
mains plug is inserted and mains voltage is given,
the power tool, even when switched off, still con-
sumes a low amount of current.
Rough Grinding
 Never use a cutting disc for roughing.
The best roughing results are achieved when set-
ting the machine at an angle of 30 ° to 40 °. Move
the machine back and forth with moderate pres-
sure. In this manner, the workpiece will not be-
come too hot, does not discolour and no grooves
are formed.
Flap Disc
With the flap disc (accessory), curved surfaces and
profiles can be worked.
Flap discs have a considerably higher service life,
lower noise levels and lower sanding temperatures
than conventional sanding sheets.
Cutting Metal
 For cutting with bonded abrasives, always use
the protection guard for cutting 9.
When cutting, work with moderate feed, adapted to
the material being cut. Do not exert pressure onto
the cutting disc, tilt or oscillate the machine.
Do not reduce the speed of running down cutting
discs by applying sideward pressure.
The machine must
always work in an up-
grinding motion.
Otherwise, the dan-
ger exists of it being
pushed uncon-
trolled out of the cut.
When cutting profiles and square bar, it is best to
start at the smallest cross section.
Cutting Stone

Provide for sufficient dust extraction when
cutting stone.

The machine may be used only for dry cutting/
grinding.
For cutting stone, it is best to use a diamond cut-
ting disc.
Operate the machine only with dust extraction and
additionally wear a dust protection mask.
The vacuum cleaner must be approved for the ex-
traction of masonry dust. Berner provides suitable
vacuum cleaners.
Switch on the ma-
chine and place the
front part of the cut-
ting guide on the
workpiece. Slide the
machine with moder-
ate feed, adapted to
the material to be
worked.
For cutting especially hard material, e. g., concrete
with high pebble content, the diamond cutting disc
can overheat and become damaged as a result.
This is clearly indicated by circular sparking, rotat-
ing with the diamond cutting disc.
In this case, interrupt the cutting process and allow
the diamond cutting disc to cool by running the
machine for a short time at maximum speed with
no load.
Noticeably decreasing work progress and circular
sparking are indications of a diamond cutting disc
that has become dull. Briefly cutting into abrasive
material (e. g. lime-sand brick) can resharpen the
disc again.
Information on Structures
Slots in structural walls are subject to the Standard
DIN 1053 Part 1, or country-specific regulations.
These regulations are to be observed under all cir-
cumstances. Before beginning work, consult the
responsible structural engineer, architect or the
construction supervisor.
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.
 In extreme conditions, always use dust extrac-
tion as far as possible. Blow out ventilation
slots frequently and install a portable residual
current device (PRCD). When working metals,
conductive dust can settle in the interior of the
power tool. The total insulation of the power tool
can be impaired.
Please store and handle the accessory(-ies) care-
fully.
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