Bosch GNF 20 CA Instructions D'emploi page 17

Operating Instructions
Wear protective goggles, ear
protection and a dust protection
mask.
Wear
sturdy shoes.
The machine may only be used for dry ma-
chining of masonry.
Pre-select the cutting depth, as described in the
same-named section.
Note: To compensate inaccuracies that occur
when breaking away the fins, the cutting depth
must be set approx. 3 mm deeper than the re-
quired slot depth.
Place the machine with the chaser rollers 6 on
the surface to be worked. The cutting unit must
be in the uppermost position.
Switch the machine on.
Press the release button 2 upwards to release
the cutting unit. Slowly lower and plunge the cut-
ting unit into the material.
Always guide the machine with both handles.
Important is the direction in which cutting is per-
formed.
The machine must always work opposite to the
direction of rotation. Therefore, never move the
machine in the other direction! Otherwise, the
danger exists 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
cutting unit out of the slot with the machine still
running, until the cutting unit engages in the up-
permost position.
Switch the machine off.
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protective gloves
Work with moderate
feed, suited to the ma-
terial being worked,
while paying attention
to the cutting direction!
Do not brake coasting cutting disks with side
pressure.
Caution! Diamond cutting discs become
very hot during operation; do not touch
them before they have cooled down.
and
Remove the remaining fin of the material with the
break-out tool 20, included in the delivery.
Curved cuts are not possible, as the diamond cut-
ting 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, the chipping off of the surface material
can be widely avoided when a slot with maximum
cutting depth is cut in first.
For cutting especially hard material, e. g.,
concrete with high gravel content, the dia-
mond cutting disc can overheat and be-
come damaged as a result. This is indi-
cated clearly by a ring of sparks that rotates
with the diamond cutting disc.
In this case, interrupt the cutting process and al-
low the diamond cutting disc to cool by running
frely at no-load speed for a short time.
Noticeable decreasing work progress and a rotat-
ing spark ring are indications of a diamond cutting
disc that has become dull. With brief cuts in an
abrasive material (e. g., chalky sand stone), it
can be sharpened again.
English - 5
20