Bosch GBM Professional 23-2 Original Operating Instructions page 8

OBJ_BUCH-43-003.book Page 8 Wednesday, October 30, 2013 11:50 AM
8 | English
Rotary drill
Maximum drilling diameter (1st/2nd gear)
– Steel
– Wood
– Aluminium
Tool holder
Weight according to EPTA-Procedure 01/2003
Protection class
The values given are valid for a nominal voltage [U] of 230 V. For different voltages and models for specific countries, these values can vary.
Assembly
 Before any work on the machine itself, pull the mains
plug.
Auxiliary Handle
 Operate your machine only with the auxiliary handle 2.
Screw the auxiliary handle 2 into the thread 9 on the gear
head.
Changing the Tool
Drilling tools with a MK2 morse taper can be inserted directly
into the tool holder 4. For drill bits with MK1 morse taper, use
the reducing sleeve 11.
Pay attention that the morse cone and the morse taper are
free of grease.
The use of drilling tools with cylindrical shank is possible with
the key chuck 13. For this, place the tapered arbor 12 into the
tool holder 4 and firmly screw on the key chuck 13.
 Do not exert any force when inserting the morse taper
or the tapered arbor. This can damage the tool holder and
the inserted tool.
Before removing the inserted tool, unscrew the auxiliary han-
dle 2.
Place the drift 10 into the opening 3 in such a manner that the
rounded-off side faces to the pressure plate 1.
If the drift 10 cannot be inserted through the drive spindle,
turn the tool insert a little.
Press the drift 10 toward the pressure plate 1 and release the
tool insert from out of the tool holder.
Dust/Chip Extraction
 Dusts from materials such as lead-containing coatings,
some wood types, minerals and metal can be harmful to
one's health. Touching or breathing-in the dusts can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dusts, such as oak or beech dust, are considered
as carcinogenic, especially in connection with wood-treat-
ment additives (chromate, wood preservative). Materials
containing asbestos may only be worked by specialists.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
 Observe the relevant regulations in your country for the
materials to be worked.
3 609 929 C77 | (30.10.13)
GBM 23-2
Professional
mm 23/13
mm 50/35
mm 28/18
MK 2 – DIN 228
kg 4.6
/II
 Prevent dust accumulation at the workplace. Dusts can
easily ignite.
Operation
Starting Operation
 Observe correct mains voltage! The voltage of the pow-
er 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.
Gear selection, mechanical
 Actuate the gear selector 7 only when the machine is at
a standstill.
Two speed ranges can be preselected with the gear selector 7.
1st gear:
Low speed range; for working with large
drilling diameter.
2nd gear:
Higher speed range; for working with small
drilling diameter.
If the gear selector 7 cannot be fully en-
gaged, lightly rotate the drive spindle with
the drill bit by twisting the drill chuck.
Switching On and Off
To start the machine, press the On/Off switch 6 and keep it
pressed.
Lock the pushed On/Off switch 6
by pushing the lock-on button 5 up-
ward.
To switch off the machine, release
the On/Off switch 6 or when it is
locked with the lock-on button 5,
briefly press the On/Off switch 6
and then release it.
Adjusting the Speed (GBM 23-2 E)
The speed of the switched on power tool can be variably ad-
justed, depending on how far the On/Off switch 6 is pressed.
Light pressure on the On/Off switch 6 results in a low rotation-
al speed. Further pressure on the switch results in an increase
in speed.
GBM 23-2 E
Professional
23/13
50/35
28/18
MK 2 – DIN 228
4.8
/II
Bosch Power Tools