Bosch GWS Professional 30-230 B Manual Original página 28

28 | English
Working advice
Rough grinding
Always use the protective guard for grinding (8)/
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(9) when rough grinding with bonded abrasives.
Never use cutting discs for rough grinding.
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When rough grinding, the protective guard for
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cutting (17)/(18) or the protective guard for
grinding (8)/(9) with a fitted cover for cutting (19)
can impact the workpiece and lead to a loss of control.
The best rough grinding results are achieved with a set angle
of 30° to 40°. Move the power tool back and forth with mod-
erate pressure. This will ensure that the workpiece does not
become too hot or discolour and that grooves are not
formed.
The protective guard for cutting (17)/(18) or the protect- u
ive guard for grinding (8)/(9) must be used with a fitted
cover for cutting (19) when using bonded discs which are
approved for cutting and grinding.
Surface grinding with flap disc
Always use the protective guard for grinding (8)/(9)
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when grinding with the flap disc.
The flap disc (accessory) enables you to machine curved
surfaces and profiles. Flap discs have a considerably longer
service life, lower noise levels and lower grinding temperat-
ures than conventional grinding discs.
Surface grinding with sanding disc
Always fit the hand guard (26) when working with the
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rubber sanding pad (27).
Grinding with a sanding disc can be done without a protect-
ive guard.
See the graphics page for fitting instructions.
Screw on the round nut (29) and tighten it with the two-pin
spanner.
Cup brush/disc brush/conical brush
Always use the protective guard for grinding (8)/(9)
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when brushing with disc brushes. Brushing with cup
brushes/conical brushes can be performed without
the protective guard.
Always fit the hand guard (26) when working with the
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cup brush or conical brush.
The wires of the disc brush can get caught on the pro-
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tective guard and break, if the maximum permitted di-
mensions of the disc brushes are exceeded.
See the graphics page for fitting instructions.
The cup brush/conical brush/disc brush with M14 thread
must be screwed onto the grinding spindle until it rests
firmly against the grinding spindle flange at the end of the
grinding spindle thread. Tighten the cup brush/conical
brush/disc brush with an open-ended spanner.
To fasten the disc brush with a diameter of 22.22 mm, at-
tach the clamping flange (35) to the grinding spindle (25),
screw on the round nut (29) and tighten with the two-hole
spanner.
1 609 92A 9AU | (09.04.2024)
Cutting Metal
For cutting metal with bonded cutting discs or dia-
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mond cutting discs, always use the protective guard
for cutting (17)/(18) or the protective guard for
grinding (8)/(9) with a fitted cover for cutting (19).
When using the protective guard for grinding (8)/(9)
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for cutting work with bonded cutting discs, there is an
increased risk of being exposed to sparks, particles
and disc fragments if the disc breaks.
When carrying out abrasive cutting, use a moderate feed
that is suited to the material being machined. Do not exert
pressure on the cutting disc and do not tilt or swing the
power tool.
Do not attempt to reduce the speed of a cutting disc coming
to a stop by applying pressure from the side.
The power tool must always work in an
up-grinding motion. Otherwise there
is a risk that it will be pushed uncon-
trolled out of the cut. For best results
when cutting profiles and rectangular
tubing, start at the smallest cross sec-
tion.
Cutting stone
For cutting stone with bonded cutting discs or dia-
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mond cutting discs for concrete/stone, always use the
extraction guard for cutting with a cutting guide (34)
or the protective guard for cutting (17)/(18) or the
protective guard for grinding (8)/(9) with a fitted
cover for cutting (19).
Provide sufficient dust extraction when cutting stone.
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Wear a dust mask.
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The power tool may be used only for dry cutting/grind-
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ing.
When using the protective guard for cutting (17)/
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(18), the protective guard for grinding (8)/(9) or the
protective guard for grinding (8)/(9) with a fitted
cover for cutting (19) for cutting and grinding applica-
tions in concrete or masonry, there is an increased
dust load and an increased risk of losing control of the
power tool, which can lead to kickback.
For cutting stone, it is best to use a diamond cutting disc.
When using the extraction guard for cutting with a cutting
guide (34), the dust extractor must be approved for extract-
ing stone dust. Suitable dust extractors are available from
Bosch.
Switch on the power tool and position
it with the front part of the cutting
guide on the workpiece. Move the
power tool with a moderate feed mo-
tion that is suited to the material being
machined.
When cutting especially hard materials such as concrete
with a high pebble content, the diamond cutting disc can
overheat and become damaged as a result. This is clearly in-
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