Manual Bosch GRB 14 CE Professional (page 13 of 143) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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Bosch Power Tools 3 609 929 C50 | (17.6.13)

Certain dusts, such as oak or beech dust, are considered

as carcinogenic, especially in connection with wood-treat-

ment additives (chromate, wood preservative). Materials

containing asbestos may only be worked by specialists.

– Provide for good ventilation of the working place.

– It is recommended to wear a P2 filter-class respirator.

Observe the relevant regulations in your country for the

materials to be worked.

 Prevent dust accumulation at the workplace. Dusts can

easily ignite.

Mounting the Auxiliary Handle (see figure A)

 Operate your machine only with the auxiliary handle 4.

Screw the auxiliary handle 4 on the right or left of the machine

head depending on the working method.

Adjusting the Auxiliary Handle (see figure B)

The auxiliary handle 4 can be adjusted, e. g., to carry out jobs

in hard to reach locations.

– Loosen locking screw 2.

– Move the auxiliary handle 4 accordingly to suit your work-

ing conditions and working position.

– Tighten locking screw 2 again.

Mounting/Replacing the Sanding belt

(see figure C)

– Push tensioning arm 7 toward guide roller 10. Remove

sanding belt 9, if required.

– With the tensioning arm 7 pushed in, mount the new sand-

ing belt 9. Pay attention that the arrow directions on the in-

side of the sanding belt and the housing of the power tool

correspond.

– Guide tensioning arm 7 back to the starting position. Pay

attention that the sanding belt 9 is properly seated on the

guide rollers 8 and 10.

Selecting the Sanding Belt

Depending on the material to be worked and the required rate

of removal, different sanding belts are available:

Operation

Starting Operation

 Observe correct mains voltage! The voltage of the pow-

er source must agree with the voltage specified on the

nameplate of the machine. Power tools marked with

230 V can also be operated with 220 V.

Switching On and Off

To start the machine, press the On/Off switch 6 and keep it

pressed.

To lock-on the pressed On/Off switch 6, push the On/Off

switch 6 further forward.

To switch off the power tool, release the On/Off switch 6, or

when it is locked, briefly press the On/Off switch 6 and then

release it.

To save energy, only switch the power tool on when using it.

Preselecting the Belt Speed

 Operate with a belt speed adapted to the application, in

order to prevent damage to the material.

The required belt speed can be adjusted with the thumbwheel

for belt speed preselection 5 (even during operation).

The required belt speed depends on the material being sand-

ed and on the working conditions, and can be determined by

practical testing.

 When using a fleece belt, do not work with a higher set-

ting than speed stage 4 (max.). Otherwise, the fleece

belt will become too hot.

Working Advice

The sanding of pipes takes place between the guide rollers 8

and 10 (see figure D).

The smaller the pipe diametre, the larger the possible wrap

angle (≤270°).

When sanding, the removal capacity and the surface quality

are mainly determined by the sanding belt selection as well as

through the preselected belt speed.

Work with the lowest possible sanding pressure in order to in-

crease the service life of the sanding belts. Excessively in-

creasing the sanding pressure does not lead to a higher sand-

ing capacity, but to more wear of the power tool and the

sanding belt.

Work with moderate feed and perform the sanding parallel

and overlapping with respect to the sanding paths.

To achieve a perfect surface, do not skip more than one grain

size when selecting the sanding belt.

Use only original Bosch sanding accessories.

Only flawless sanding belts achieve good sanding capacity

and make the machine last longer.

 Do not clamp power tools in the saw stand. Clamped

power tools and sharp-edged application tools may result

in serious injury.

Storage of the Sanding Belts

Store sanding belts in their original packaging at

15 °C –25 °C room temperature and 40 % – 70 % humidity.

Do not store sanding belts on concrete floors, close to open

windows or heaters.

Do not bend or kink the sanding belts, otherwise they will be-

come unusable.

Maintenance and Service

Maintenance and Cleaning

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

plug.

Grain size

For dry sanding and pre-sanding coarse 40, 60

For structuring and for smoothing

out minor unevenness medium 80, 120

For fine structuring

fine 180

Fleece belts

OBJ_BUCH-1843-002.book Page 13 Monday, June 17, 2013 1:27 PM

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Bosch GRB 14 CE Professional Manual

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