Manual Bosch GNF 65 A (page 14 of 105) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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14 | English

1 609 929 N87 | (13.2.09) Bosch Power Tools

– Place the power tool in such a manner on

both rear chaser rollers 3, that the diamond

cutting discs do not touch the workpiece.

– Switch the machine on and slowly plunge in-

to the material.

– Guide the machine with both handles, apply-

ing moderate feed, suited to the material be-

ing worked.

– The machine must always work in an up-

grinding motion. Otherwise, the danger ex-

ists of it being pushed uncontrolled out of

the cut.

– The machine can be both pushed or pulled in

the cutting direction. Vertical slots can easily

be cut by pulling the machine from top to

bottom.

– After finishing the working procedure, swivel

the diamond cutting discs out of the slot with

the machine still running.

– Switch the power tool off.

Do not brake coasting diamond cutting discs by

applying sideward pressure.

f Never set down a coasting machine on the

chaser rollers 3, but always aside, so that

the diamond cutting discs can rotate freely

and do not face toward your body.

f Diamond cutting discs become very hot dur-

ing operation; do not touch them until they

have cooled down.

Remove the remaining fin of the material with

the break-out tool 21.

Curved cuts are not possible, as the diamond

cutting discs could jam in the material.

When cutting through plate materials, ensure

that the materials are firmly backed on a surface

or supported.

When breaking through walls, e. g. with a rotary

hammer, most of the chipping-off of the surface

material can be avoided by first cutting in a slot

with maximum cutting depth.

For cutting expecially hard material, e. g., con-

crete with high pebble content, the diamond cut-

ting disc can overheat and become damaged as a

result. This is clearly indicated by circular spark-

ing, rotating with the diamond cutting disc.

In this case, interrupt the cutting process and al-

low the diamond cutting disc to cool by running

the machine for a short time at maximum speed

with no load.

Noticeable decreasing work progress and circu-

lar sparking are indications of a diamond cutting

disc that has become dull. Briefly cutting into

abrasive material (e. g. lime-sand brick) can re-

sharpen 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

circumstances. Before beginning work, consult

the responsible structural engineer, architect or

the construction supervisor.

The permitted slot depth and width depends on

the slot length, wall thickness and the building

material used.

OBJ_BUCH-916-001.book Page 14 Friday, February 13, 2009 11:21 AM

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Bosch GNF 65 A Manual

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