Manual Bosch GWS 20-230 JH Professional (page 21 of 284) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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22 | English

1 609 92A 0MJ | (23.4.14) Bosch Power Tools

Working Advice

 Exercise caution when cutting slots in structural walls;

see Section “Information on Structures”.

 Clamp the workpiece if it does not remain stationary

due to its own weight.

 Do not strain the machine so heavily that it comes to a

standstill.

 After heavily straining the power tool, continue to run

it at no-load for several minutes to cool down the acces-

sory.

 Do not touch grinding and cutting discs before they

have cooled down. The discs can become very hot while

working.

 Do not use the power tool with a cut-off stand.

Note: When not using for extended periods, pull the mains

plug out of the socket outlet. When the mains plug is inserted

and mains voltage is given, the power tool, even when

switched off, still consumes a low amount of current.

Rough Grinding

 Never use a cutting disc for roughing.

The best roughing results are achieved when setting the ma-

chine 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 conventional

sanding sheets.

Cutting Metal

 For cutting with bonded abrasives, always use the pro-

tection guard for cutting 13.

When cutting, work with moderate feed, adapted to the mate-

rial being cut. Do not exert pressure onto the cutting disc, tilt

or oscillate the machine.

Do not reduce the speed of running down cutting discs by ap-

plying sideward pressure.

The machine must al-

ways work in an up-

grinding motion. Other-

wise, the danger exists

of it being pushed un-

controlled out of the

cut.

When cutting profiles and square bar, it is best to start at the

smallest cross section.

Cutting Stone

 Provide for sufficient dust extraction when cutting

stone.

 Wear a dust respirator.

 The machine may be used only for dry cutting/grinding.

For cutting stone, it is best to use a diamond cutting disc.

When using the cutting guide with dust extraction protection

guard 24, the vacuum cleaner must be approved for vacuum-

ing masonry dust. Suitable vacuum cleaners are available

from Bosch.

Switch on the machine

and place the front part

of the cutting guide on

the workpiece. Slide the

machine with moderate

feed, adapted to the ma-

terial to be worked.

For cutting especially 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 cir-

cular sparking, rotating with the diamond cutting disc.

In this case, interrupt the cutting process and allow the dia-

mond cutting disc to cool by running the machine for a short

time at maximum speed with no load.

Noticeably 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 circumstanc-

es. Before beginning work, consult the responsible structural

engineer, architect or the construction supervisor.

Maintenance and Service

Maintenance and Cleaning

 Before any work on the machine itself, pull the mains

plug.

 For safe and proper working, always keep the machine

and ventilation slots clean.

 In extreme conditions, always use dust extraction as

far as possible. Blow out ventilation slots frequently

and install a residual current device (RCD). When work-

ing metals, conductive dust can settle in the interior of the

power tool. The total insulation of the power tool can be im-

paired.

OBJ_BUCH-1686-003.book Page 22 Wednesday, April 23, 2014 3:36 PM

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Bosch GWS 20-230 JH Professional Manual

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