Manual Bosch PWS720-125 (page 20 of 117) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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20 | English

2 609 005 556 | (23.9.11) Bosch Power Tools

When operating the machine with power from mobile genera-

tors that do not have sufficient reserve capacity or are not

equipped with suitable voltage control with starting current

amplification, loss of performance or untypical behavior can

occur upon switching on.

Please observe the suitability of the power generator being

used, particularly with regard to the mains voltage and fre-

quency.

Switching On and Off

To start the power tool, push the On/Off switch 3 forwards.

To lock the On/Off switch 3, press the On/Off switch 3 down

at the front until it latches.

To switch off the power tool, release the On/Off switch 3 or,

if it is locked, briefly push down the back of the On/Off switch

3 and then release it.

f Check grinding tools before using. The grinding tool

must be mounted properly and be able to move freely.

Carry out a test run for at least one minute with no load.

Do not use damaged, out-of-centre or vibrating grind-

ing tools. Damaged grinding tools can burst and cause in-

juries.

Working Advice

f Exercise caution when cutting slots in structural walls;

see Section “Information on Structures ”.

f Clamp the workpiece if it does not remain stationary

due to its own weight.

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

standstill.

f After heavily straining the power tool, continue to run

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

sory.

f Grinding and cutting discs become very hot while

working; do not touch until they have cooled.

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

Rough Grinding

f 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

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

tection guard for cutting 10.

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

f Provide for sufficient dust extraction when cutting

stone.

f Wear a dust respirator.

f 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 17, 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 expecially 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.

Noticeable 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.

OBJ_DOKU-28019-001.fm Page 20 Friday, September 23, 2011 8:28 AM

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Bosch PWS720-125 Manual

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