Bosch Professional GNF 65 A Original Instructions Manual page 14

OBJ_BUCH-916-001.book Page 14 Friday, February 13, 2009 11:21 AM
14 | English
– 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.
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.
Diamond cutting discs become very hot dur-
ing operation; do not touch them until they
have cooled down.
1 609 929 N87 | (13.2.09)
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.
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