Starting Operation - Bosch GDB 2500 WE PROFESSIONAL Bedienungsanleitung

OBJ_BUCH-114-001.book Page 13 Thursday, September 28, 2006 12:42 PM
Inserting a Core Bit
Examine the core bit before inserting it. Use
only core bits that are in perfect condition.
Damaged or deformed core bits can lead to danger-
ous situations.
Clean the core bit before inserting it. Apply a light coat
of grease to the core bit thread or spray on a corrosion
protection agent.
Either screw an R 1/2" core bit into the drill spindle 9
or a 1 1/4"-UNC core bit onto the drill spindle 9.
Check the proper seating of the core bit. Incor-
rectly or unsecurely fastened core bits can become
loose during operation and may pose a danger.
Inserting a sliding ring 8 (accessory) between the drill
spindle and the 1 1/4"-UNC core bit provide for easier
loosening of the core bit after use.
Removing a Core Bit
Wear protective gloves when replacing the
core bit. The core bit can become hot after pro-
longed operation of the power tool.
Loosen the core bit 7 with an open-end spanner
(1 1/4"-UNC core bit: Size 41 mm; R 1/2" core bits:
Size 22 mm). Counterlock with a second open-end
spanner (size 36 mm) against the flats of the drill spin-
dle 9.
Connecting the Water Cooling
When wet-drilling core bits are not sufficiently cooled
during drilling, the diamond segments can become
damaged or the core bit can become jammed in the
bore hole. Therefore, provide for a sufficient water sup-
ply during wet drilling.
When boring out a given bore, the given bore must be
carefully plugged in order to enable sufficient cooling of
the core bit.
Connected hoses, shut-off valves or accesso-
ries must not obstruct or hinder the drilling
process.
Shut the water cock 11. Connect water supply to the
water-outlet connector 2. The water supply is possible
either via a mobile water-pressure container (acces-
sory) or via stationary water connection.
In order to collect the water coming out of the bore dur-
ing wet-drilling, a water collection ring and a multi-pur-
pose vacuum cleaner are required (both accessories).
For assembly of the water collection ring, read and fol-
low its operating instructions.
3 609 929 A54 • 28.9.06
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.
Before beginning work, consult the structural
engineer, architect or construction supervisor
in charge. Only cut through reinforcements
with the permission of a structural engineer.
When core drilling through walls or floors,
ensure to check the respective rooms/enclo-
sures for obstructions. Barrier off the construc-
tion site and secure the drilled out core against
falling down with the use of casing or similar.
Operational Check of the Residual Current Device
Check the proper function of the residual current
device 3 each time before working:
• Push the "RESET" button on the residual current
device. The service readiness of the residual current
device is signalled through a red control indicator.
• Push the "TEST" button. The indicator above the
"RESET" button becomes black.
Switching On
Push the "RESET" button on the residual current
device 3.
Open the water cock 11. Check the flow of water at the
water-flow indicator 10.
For starting the drilling procedure at half speed,
turn the On/Off switch 13 to the 1/2 position. The
switch cannot be locked in this position.
For drilling, turn the On/Off switch 13 to the I position.
Switching Off
Release the On/Off switch 13 or turn it to the 0 position.
Shut the water cock 11. After finishing work, disconnect
the water outlet connector 2 from the water supply.
Open the water cock 11 and drain the remaining water.
Adjusting the Speed
Two speed ranges can be preselected with the gear
selector 4.
The two gears are recommended for the following bore
diameters:
1st gear 82–212 mm
2nd gear 32–132 mm
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