Bosch PWS 20-230 Manual Original página 29

OBJ_BUCH-976-001.book Page 30 Monday, April 20, 2009 8:21 AM
30 | English
After heavily straining the power tool, con-
tinue to run it at no-load for several minutes
to cool down the cutting/grinding tool.
Grinding and cutting discs become very hot
while working; do not touch until they have
cooled.
Do not use the power tool with a cut-off
stand.
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 tem-
peratures than conventional sanding sheets.
Cutting Metal
For cutting metal, always work with the pro-
tection guard for cutting 7.
When cutting, work with moderate feed, adapt-
ed to the material being cut. Do not exert pres-
sure onto the cutting disc, tilt or oscillate the
machine.
Do not reduce the speed of running down cut-
ting discs by applying sideward pressure.
1 609 929 S69 | (20.4.09)
Cutting Stone
For cutting stone, always work with the cut-
ting guide with dust extraction protection
guard 20.
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 jam-
ming, the cutting guide with dust extraction pro-
tection guard 20 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
extraction of masonry dust. Bosch provides suit-
able vacuum cleaners.
For cutting expecially hard material, e. g., con-
crete with high pebble content, the diamond cut-
ting 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 al-
low the diamond cutting disc to cool by running
the machine for a short time at maximum speed
with no load.
The machine must
Noticeable decreasing work progress and circu-
always work in an
lar sparking are indications of a diamond cutting
up-grinding mo-
disc that has become dull. Briefly cutting into
tion. Otherwise,
abrasive material (e. g. lime-sand brick) can re-
the danger exists
sharpen the disc again.
of it being pushed
uncontrolled out Information on Structures
of the cut.
Slots in structural walls are subject to the
When cutting pro- Standard DIN 1053 Part 1, or country-specific
files and square regulations.
bar, it is best to
These regulations are to be observed under all
start at the small- circumstances. Before beginning work, consult
est cross section. the responsible structural engineer, architect or
the construction supervisor.
Switch on the ma-
chine and place
the front part of
the cutting guide
on the workpiece.
Slide the machine
with moderate
feed, adapted to
the material to be
worked.
Bosch Power Tools