# Working advice

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- Always use the protective guard for grinding (7) when rough grinding with bonded abrasives.

- Never use cutting discs for rough grinding.

- When rough grinding, the protective guard for cutting (8) or the protective guard for grinding (7) with a fitted cover for cutting (9) 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 moderate 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 (8) or the protective guard for grinding (7) with a fitted cover for cutting (9) must be used when using bonded discs which are approved for cutting and grinding.

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- Always use the protective guard for grinding (7) 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 temperatures than conventional grinding discs.

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- Always fit the hand guard (19) when working with the rubber sanding pad (20).

Grinding with a sanding disc can be done without a protective guard.

See the graphics page for fitting instructions.

Screw on the round nut (22) and tighten it with the two-pin spanner.

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- Always use the protective guard for grinding (7) when brushing with disc brushes. Brushing with cup brushes can be performed without the protective guard.

- Always fit the hand guard (19) when working with the cup brush or disc brush.

- The wires of the disc brush can get caught on the protective guard and break, if the maximum permitted dimensions of the disc brushes are exceeded.

See the graphics page for fitting instructions.

The cup brush/disc brush 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/disc brush with an open-ended spanner.

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- For cutting metal with bonded cutting discs or diamond cutting discs, always use the protective guard for cutting (8) or the protective guard for grinding (7) with a fitted cover for cutting (9).

- When using the protective guard for grinding (7) 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 uncontrolled out of the cut. For best results when cutting profiles and rectangular tubing, start at the smallest cross section.

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- For cutting stone with bonded cutting discs or diamond cutting discs for concrete/stone, always use the extraction guard for cutting with a cutting guide (25) or the protective guard for cutting (8) or the protective guard for grinding (7) with a fitted cover for cutting (9).

- Provide sufficient dust extraction when cutting stone.

- Wear a dust mask.

- The power tool may be used only for dry cutting/grinding.

- When using the protective guard for cutting (8) , the protective guard for grinding (7) or the protective guard for grinding (7) with a fitted cover for cutting (9) for cutting and grinding applications 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 (25), the dust extractor must be approved for extracting 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 motion 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 indicated by circular sparking, rotating with the diamond cutting disc.

If this happens, stop cutting and allow the diamond cutting disc to cool down by running the power tool for a short time at maximum speed with no load.

If work is noticeably slower and with circular sparking, this indicates that the diamond cutting disc has become blunt. You can resharpen the disc by briefly cutting into abrasive material (e.g. lime-sand brick).

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- For cutting materials such as plastics with bonded cutting discs, always use the protective guard for cutting (8) or the protective guard for grinding (7) with a fitted cover for cutting (9).

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- Only use dry diamond annular cutters.

- Always fit the hand guard (19) when working with diamond annular cutters.

Do not place the diamond annular cutter parallel to the workpiece. Plunge it into the workpiece at an angle and in a circular motion. This will allow you to achieve optimal cooling and ensure a longer tool life for the diamond annular cutter.

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Recesses in load-bearing walls are subject to country-specific regulations. These regulations must be observed under all circumstances. Seek advice from the responsible structural engineer, architect or construction supervisor before starting work.