Bosch GBM 32-4 Professional - Manual (Page 13)

English | 13
Bosch Power Tools 1 609 92A 06C | (7.3.13)
The use of drilling tools with cylindrical shank is possible with
the key chuck 12. For this, screw the tapered arbor 11 onto
the key chuck 12 and insert the tapered arbor with the reduc-
ing sleeve 10 into the tool holder 1.
 Do not exert any force when inserting the morse taper
or the tapered arbor. This can damage the tool holder and
the inserted tool.
Place the drift 9 into the opening 2 in such a manner that the
rounded-off side faces to the auxiliary handle 5.
If the drift 9 cannot be inserted through the drive spindle, turn
the tool insert a little.
Press the drift 9 toward the auxiliary handle 5 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.
 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 3 only when the machine is at
a standstill.
Four speed ranges can be preselected with the gear selector
3. Press the gear selector 3 down, slide it to the requested
setting according to the gearing diagram and allow it to en-
gage at the respective end position.
If the gear selector 3 cannot be slid to the stop, lightly rotate
the drive spindle via the drill bit.
Switching On and Off
To start the machine, press the On/Off switch 7 and keep it
pressed.
To lock the pressed On/Off switch 7, press the lock-on button
6.
To switch off the machine, release the On/Off switch 7 or
when it is locked with the lock-on button 6, briefly press the
On/Off switch 7 and then release it.
To save energy, only switch the power tool on when using it.
Working Advice
Use drilling lubricant or cutting oil for cooling and lubrication,
and to avoid overheating or jamming of the drill bit.
When drilling diameters >10 mm, drill a pilot hole with a small
drilling diameter. This allows you to reduce the feed pressure
and the power tool is strained less.
For drilling in metal, use only perfectly sharpened HSS drill
bits (HSS=high-speed steel). The appropriate quality is guar-
anteed by the Bosch accessories program.
The machine vice, which is available as an accessory, enables
secure clamping of workpieces. This prevents the workpiece
from turning and any accidents this would cause.
Maintenance and Service
Maintenance and Cleaning
 Before any work on the machine itself, pull the mains
plug.
 For safe and proper working, always keep the machine
and ventilation slots clean.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.
If the machine should fail despite the care taken in manufac-
turing and testing procedures, repair should be carried out by
an after-sales service centre for Bosch power tools.
In all correspondence and spare parts order, please always in-
clude the 10-digit article number given on the type plate of
the machine.
1st gear:
Low speed range; for working with
large drilling diameter.
2nd gear:
Average speed range.
3rd gear:
Average speed range.
4th gear:
High speed range; for working with
small drilling diameter.
OBJ_BUCH-506-003.book Page 13 Thursday, March 7, 2013 11:33 AM