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OBJ_BUCH-126-002.book Page 21 Wednesday, February 19, 2014 1:49 PM
To start the power tool, push the On/Off switch 10 forwards.
To lock the On/Off switch 10, press the On/Off switch 10
down at the front until it latches.
To switch off the power tool, release the On/Off switch 10 or,
if it is locked, briefly push down the back of the On/Off switch
10 and then release it.
To save energy, only switch the power tool on when using it.
Check the diamond cutting discs before use. The dia-
mond cutting disc(s) must be mounted properly and be
able to rotate freely. Carry out a test run for at least one
minute without any load. Do not use diamond cutting
discs that are damaged, out-of-balance, or vibrate.
Damaged diamond cutting discs can rupture and lead to in-
juries.
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.
Constant Electronic Control
Constant electronic control holds the speed constant at no-
load and under load, and ensures uniform working perfor-
mance.
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 (GNF 35 CA)
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 10 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.
Protect the cutting disc against impact, shock and grease. Do
not subject the cutting disc to lateral pressure.
– 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 machine with the chaser rollers 7 on the surface
to be worked. The cutting unit must be in the uppermost
position.
– Switch on the machine.
Bosch Power Tools
– Push the release button 3 upwards to release the cutting
unit. Slowly lower and plunge the cutting unit into the ma-
terial.
– 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. Guide the machine in the direction of
the working-direction arrow 8.
– 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.
– 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 uppermost position.
– Switch the power tool off.
Do not brake coasting diamond cutting discs by applying side-
ward pressure.
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 22.
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 expecially 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.
Noticeable 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.
English | 21
22
3 609 929 C89 | (19.2.14)
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