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Operation
Starting Operation
Observe correct mains voltage! The voltage of the
power source must agree with the voltage specified on
the nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.
Switching On and Off
To start the machine, first slide the lock-off button 4 to
the rear and then push the On/Off switch 3 and keep
it pressed.
To switch off the machine, release the On/Off
switch 3.
B Check grinding tools before using. The grind-
ing 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 grinding
tools. Damaged grinding tools can burst and cause
injuries.
Operating Instructions
Exercise caution when cutting slots in structural
walls; see Section "
Clamp the workpiece if it does not remain sta-
tionary due to its own weight.
Do not strain the machine so heavily that it
comes to a standstill.
Grinding and cutting discs become very hot while
working; do not touch until they have cooled.
Rough Grinding
Never use a cutting disc for roughing.
The best roughing results are achieved when setting
the machine at an angle of 30° to 40°. Move the
machine back and forth with moderate pressure. In this
manner, the workpiece will not become 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 con-
ventional sanding sheets.
Cutting
When cutting, work with moderate feed, adapted to the
material being cut. Do not exert pressure onto the cut-
ting disc, tilt or oscillate the machine.
Do not reduce the speed of running down cutting discs
by applying sideward pressure.
1 609 929 J46 • 15.12.05
Information on Structures
Cutting Stone
The machine may be used only for dry cut-
ting/grinding.
For cutting stone, it is best to use a diamond cutting
disc. As a safety measure against jamming, the cutting
guide with special dust extraction protection guard 19
must be used.
Operate the machine only with dust extraction and
additionally wear a dust protection mask.
The vacuum cleaner must be approved for the extrac-
tion of masonry dust. Bosch provides suitable vacuum
cleaners.
".
For cutting expecially 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, rotating 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.
Noticeable 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 circum-
stances. Before beginning work, consult the responsi-
ble structural engineer, architect or the construction
supervisor.
English–8
The
machine
must
always work in an up-
grinding motion. Other-
wise, the danger exists
of it being pushed
uncontrolled out of
the cut.
When cutting profiles
and square bar, it is
best to start at the
smallest cross section.
Switch on the machine
and place the front part
of the cutting guide on
the workpiece. Slide
the machine with mod-
erate feed, adapted to
the
material
to
be
worked.
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