Inserting/Changing The Core Bit; Connecting The Water Cooling/Dust Extraction System - Bosch GDB 180 WE Professional Manual Original

The vacuum pump must meet the following minimum re-
quirements:
Volume flow:
Vacuum at least:
The surface must be smooth and flat in order to fasten with
vacuum. Use on plaster or brickwork is not permitted.
Once the vacuum connection has been established, gently
attach the levelling screws (22) to the base material so that
the drill stand is in a rigid position and the sealing ring re-
laxes slightly. Otherwise the drill stand will sit very softly on
the sealing ring.
In order to connect the vacuum pump and Bosch vacuum
set, please read and follow the respective operating instruc-
tions.
The safety and operating instructions for the vacuum
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pump and vacuum set must be strictly observed.
Levelling (does not apply for fastening by vacuum)
Turn the levelling screws (22) in or out individually until the
spirit level (3) on the power tool (when mounting vertically)
or the spirit level (4) on the power tool (when mounting hori-
zontally) is perfectly level.
Then fix the drill stand firmly in place using an anchor attach-
ment.

Inserting/changing the core bit

Before carrying out any work on the drill stand or drill,
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during work breaks and when not using the drill stand,
secure the drill stand against unintentional movement
by tightening the parking brake.
Selecting the core bit
Bosch core bits are colour-coded:
– Wet core bits: Blue
– Dry core bits: Light grey
Inserting the core bit
Always examine the core bits before inserting them.
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Only use core bits that are free of defects. Using dam-
aged or deformed core bits may result in dangerous situ-
ations.
Clean the core bits before inserting them. Lightly grease the
thread of the core bit or spray it with corrosion inhibitor.
Screw a 1 1/4" UNC core bit (8) onto the drill spindle (7).
Check that the core bit is fitted securely. Core bits that
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are attached incorrectly or are not securely fixed in place
may come loose during operation, thereby putting you at
risk.
Removing the core bit
Wear protective gloves when changing the core bit.
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The core bit may become hot when the power tool is op-
erated for extended periods of time.
Detach the core bit (8) using an open-ended spanner (width
across flats 41 mm). When doing so, hold a second open-
ended spanner (width across flats 32 mm) on the two flats
of the drill spindle (7) to provide counterforce.
Bosch Power Tools
Connecting the water cooling/dust extraction
system
3
6 m /h
If wet or dry core bits are not sufficiently cooled when
80 % (–800 mbar)
drilling, the diamond segments can become damaged or the
core bit can jam in the drill hole. You should therefore ensure
that the water cooling system provides sufficient cooling
when wet drilling, or that the dust extraction system is func-
tioning properly when dry drilling.
When expanding an existing hole, this must be sealed care-
fully to allow the core bit to be sufficiently cooled.
Connected hoses, shut-off valves or accessories must
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not interfere with drilling.
Connecting the water cooling system
Attach the water connection adapter (12) to the claw
coupling (6) and tighten it by turning it clockwise as far as
possible.
Close the water cutoff valve (10). Connect a water supply
line to the valve adapter (11). The water supply line can be
provided from a mobile pressurised water tank (accessory)
or a stationary water connection.
You will need a water collection ring and a wet/dry extractor
(both accessories) to collect the water that escapes from the
drill hole during wet drilling.
Fitting a water collection ring for water extraction
(see figure C)
The water collection ring (see "Accessories/replacement
parts", page 21) is intended for use with the drill stand for
diamond drills GCR 180 and the diamond drill
GDB 180 WE.
Cut an opening for the required drilling diameter in the seal-
ing cover.
Push the tension spring (33) as far as possible into the gap
between the base plate (25) and drill column (20). Make
sure that the angled section of the tension spring is facing
downwards.
Put the water collection ring in position and place the ten-
sion spring on the contact points on the water collection
ring. (The lugs on the ends of the tension spring are used to
pull the tension spring upwards.)
The tensioning force of the spring will press the water collec-
tion ring with its seal onto the surface. Together with the va-
cuum of the wet/dry extractor, this will prevent water from
escaping.
Connecting the dust extraction system
The dust from materials such as lead paint, some types of
wood, minerals and metal can be harmful to human health.
Touching or breathing in this dust can trigger allergic reac-
tions and/or cause respiratory illnesses in the user or in
people in the near vicinity.
Certain dusts, such as oak or beech dust, are classified as
carcinogenic, especially in conjunction with wood treatment
additives (chromate, wood preservative). Materials contain-
ing asbestos may only be machined by specialists.
– Use a dust extraction system that is suitable for the ma-
terial wherever possible.
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1 609 92A 4NJ | (24.03.2021)