Bosch GBH 7-46 DE Professional Original Instructions Manual page 18

18 | English
Operation
Starting Operation
Observe correct mains voltage! The voltage
of the power source must agree with the
voltage specified on the nameplate of the
machine. Power tools marked with 230 V can
also be operated with 220 V.
Setting the Operating Mode
The operating mode of the power tool is selected
with the mode selector switch 3.
Note: Change the operating mode only when the
machine is switched off! Otherwise, the machine
can be damaged.
Turn the mode selector switch 3 to the requested
position.
Position for hammer drilling
When the drilling tool does not im-
mediately rotate upon switching on,
allow the machine to run slowly un-
til the drilling tool rotates.
Vario-Lock position for adjustment
of the chiselling position
Position for chiselling
In the "chiselling" position, the impact rate
preselected with the thumbwheel 5 is automati-
cally increased when switching on; this causes
the power tool to operate with increased capaci-
ty when chiselling.
Switching On/Off in Drilling Mode
To start the machine, press the On/Off switch 4
and keep it depressed.
To switch off the machine, release the On/Off
switch 4.
1 619 929 732 | (9.8.07)
Switching On/Off in Chiselling Mode
To start the machine, press the On/Off switch 4
at the top (I) until it locks.
To switch off the machine, press the On/Off
switch 4 at the bottom (0) and release it.
For low temperatures, the power tool reaches
the full hammer/impact capacity only after a cer-
tain time.
Setting the Speed/Impact Rate
The electronic control enables stepless speed
and impact preselection in accordance with the
material to be worked.
The constant electronic control keeps the prese-
lected speed and impact rate nearly constant be-
tween no-load and load conditions.
The maximum hammering capacity is achieved
when the thumbwheel 5 is set to position "6".
For lower speed settings, the hammering capaci-
ty is lower due to technical reasons.
Select the speed with the thumbwheel 5 accord-
ing to the material.
The data in the following table are recommended
values.
Operating Hammer Drilling
Mode
Thumb- Rated
wheel 5 Speed
(rpm)
1 145
2 170
3 200
4 225
5 255
6 280
Chiselling
Impact Impact
Rate Rate
(bpm) (bpm)
1350 1375
1625 1650
1975 2025
2175 2225
2475 2550
2700 2800
Bosch Power Tools