Bosch Professional GNF 65 A Original Instructions Manual page 10
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Also See for Professional GNF 65 A:
- Original instructions manual (254 pages) ,
- Operating instructions manual (79 pages) ,
- Original instructions manual (156 pages)
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OBJ_BUCH-916-003.book Page 10 Thursday, February 25, 2016 10:55 AM
10 | English
Reduced starting current
The electronic reduced starting current limits the power con-
sumption when switching the tool on and enables operation
from a 13 ampere fuse.
Overload Protection
When overloaded, the motor comes to a stop. Relieve the load
on the machine immediately and allow to cool down for ap-
prox. 30 seconds at the highest no-load speed.
Restarting Protection
The restarting protection feature prevents uncontrolled re-
starting of the machine after an interruption in the power sup-
ply.
To restart the operation, switch the On/Off switch 1 to the
Off position and start the machine again.
Note: Check the function of the restarting protection feature
regularly by having the mains plug pulled during operation
and plugged in again afterwards.
Working Advice
Exercise caution when cutting slots in structural walls;
see Section "Information on Structures".
Do not strain the machine so heavily that it comes to a
standstill.
Clamp the workpiece if it does not remain stationary
due to its own weight.
The machine may only be used for dry cutting.
Always guide the machine with both handles. Do not
guide or carry the machine by the elbow.
– Adjust the cutting depth, see section "Pre-selecting the
Cutting Depth". To compensate inaccuracies that occur
when breaking away the fin, the cutting depth must be set
approx. 3 mm deeper than the requested slot depth.
– 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 into the material.
– Guide the machine with both handles, applying moderate
feed, suited to the material being worked.
– The machine must always work in an up-grinding motion.
Otherwise, the danger exists of it being pushed uncon-
trolled out of the cut.
– The machine can be both pushed or pulled in the cutting di-
rection. Vertical slots can easily be cut by pulling the ma-
chine from top to bottom.
1 609 92A 1VF | (25.2.16)
– 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 side-
ward pressure.
Never set down a coasting machine on the chaser roll-
ers 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 during opera-
tion; 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 materi-
als 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 avoid-
ed by first cutting in a slot with maximum cutting depth.
For cutting especially 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.
Noticeably 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.
The permitted slot depth and width depends on the slot
length, wall thickness and the building material used.
21
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