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Bosch GNF 20 CA Manual

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28 | English
1 609 929 K57 | (27.11.07) Bosch Power Tools
Reduced starting current
The electronic reduced starting current limits
the power consumption 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 performance.
Overload Protection
When overloaded, the motor comes to a stop.
Relieve the load on the machine immediately
and allow to cool down for approx. 30 seconds
at the highest no-load speed.
Restarting Protection (GNF 35 CA)
The restarting protection feature prevents un-
controlled restarting of the machine after an in-
terruption in the power supply.
To restart the operation, switch the On/Off
switch 10 to the Off position and start the ma-
chine again.
Note: Check the function of the restarting pro-
tection feature regularly by having the mains
plug pulled during operation and plugged in
again afterwards.
Working Advice
f Exercise caution when cutting slots in
structural walls; see Section “Information
on Structures ”.
f Do not strain the machine so heavily that it
comes to a standstill.
f Clamp the workpiece if it does not remain
stationary due to its own weight.
f The machine may only be used for dry cut-
ting.
– Adjust the cutting depth, see section “Pre-se-
lecting 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.
– Push the release button 3 upwards to release
the cutting unit. Slowly lower and plunge the
cutting unit into 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. Guide the machine in the direction of
the working-direction arrow 8.
– 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 ma-
chine still running, until the cutting unit en-
gages in the uppermost position.
– Switch the power tool off.
Do not brake coasting diamond cutting discs by
applying sideward pressure.
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.
21
OBJ_BUCH-126-001.book Page 28 Tuesday, November 27, 2007 9:54 AM
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