Working Advice - Bosch GWS 11-125 Professional Manual Original

34 | English
Certain dusts, such as oak or beech dust, are classified as
carcinogenic, especially in conjunction with wood treatment
additives (chromate, wood preservative). Materials contain-
ing asbestos may only be machined by specialists.
– Use a dust extraction system that is suitable for the ma-
terial wherever possible.
– Provide good ventilation at the workplace.
– It is advisable to wear a P2 filter class breathing mask.
The regulations on the material being machined that apply in
the country of use must be observed.
Avoid dust accumulation at the workplace. Dust can
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easily ignite.
Operation
Do not load the power tool so heavily that it comes to a
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stop.
Pull the plug out of the socket before carrying out any
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work on the power tool.
Exercise caution when cutting slots in structural walls;
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see the "Information on structural design" section.
Clamp the workpiece if it is not secure under its own
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weight.
If the power tool has been subjected to a heavy load,
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continue to run it at no-load for several minutes to
cool down the accessory.
Do not use the power tool with a cut-off stand.
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Do not touch grinding and cutting discs until they have
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cooled down. The discs can become very hot while work-
ing.

Working advice

Rough grinding
Always use the protective guard for grinding (8) when
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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 (7) or the protective guard for grinding (8)
with a fitted cover for cutting (27) 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 (7) or the protective
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guard for grinding (8) with a fitted cover for cutting (27)
must be used when using bonded discs which are ap-
proved for cutting and grinding.
Surface grinding with flap disc
Always use the protective guard for grinding (8) when
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grinding with the flap disc.
The flap disc (accessory) enables you to machine curved
surfaces and profiles. Flap discs have a considerably longer
1 609 92A 5RE | (16.02.2022)
service life, lower noise levels and lower grinding temperat-
ures than conventional grinding discs.
Surface grinding with sanding disc
Always fit the hand guard (21) when working with the
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rubber sanding pad (23).
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 (25) and tighten it with the two-pin
spanner.
Cup brush/disc brush/conical brush
Always use the protective guard for grinding (8) when
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brushing with disc brushes. Brushing with cup
brushes/conical brushes can be performed without
the protective guard.
Always fit the hand guard (21) 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 mounting flange with O-ring (10) to the grinding
spindle (17), screw on the round nut (25) and tighten with
the two-pin spanner.
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 (7) or the protective guard for grinding (8)
with a fitted cover for cutting (27).
When using the protective guard for grinding (8) for
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cutting work with bonded cutting discs, there is an in-
creased 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 mo-
tion. Otherwise there is a
risk that it will be pushed
uncontrolled out of the cut.
For best results when cut-
ting profiles and rectangular
tubing, start at the smallest
cross section.
Bosch Power Tools