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NOTE
The clearance is set correctly if, when the
clamping lever is released, the spindle head with
the mounted wet diamond drill does not move
downward under its own weight or if so, moves
very slowly.
6.5
Switching on the wet diamond
drill and drilling
•
Before starting up the wet diamond drill, check
all the points described in the "Before starting
work" chapter (see page 40 ff.).
•
Select the core drill bit and fit (see "Fitting or
changing the wet diamond core drill bit" on page
41).
NOTE
Changing gear while the machine is running can
cause damage to the drill.
Wait for the machine to completely stop.
•
5
Set the appropriate speed for the core drill
diameter (see "Technical Characteristics" on
page 38) at the gear change knob.
WARNING
Risk of injury due to falling drill cores.
Î If drilling openings through objects, always
check the rooms below or behind and block off
the danger zone. Use formwork to secure the
drill core against falling.
•
Switch on the wet diamond drill and wait
14
until the working speed has been reached –
green LED (1) lights up.
NOTE
Speed electronics with LEDs are provided for the
BDB 817 only.
•
10
Open water supply (1) slightly.
•
Set water suction to continuous operation.
•
14
Turn the capstan handle in a clockwise
direction to slowly immerse the diamond core
drill bit into the material to be drilled – the green
LED (1) must not go out.
NOTE
Speed electronics with LEDs are provided for the
BDB 817 only.
•
As soon as the diamond drill bit has visibly
immersed in the drilled material the feed can be
increased.
NOTE
The diamond core drill bit can become blunt or
damaged due to overheating.
The feed may only be as high as the diamond core
drill bit can wear away the material. Therefore, do
not exert too much pressure on the diamond core
drill bit (see "Handling wet diamond core drill bits"
on page 46).
NOTE
Speed electronics with LEDs are provided for the
BDB 817 only.
•
14
If the feed is too fast, the red LED (2) lights
up. Then, reduce the feed immediately until the
green LED (1) lights up again.
If this warning signal is ignored, i.e. the feed is
not reduced, the electronics switch off the wet
diamond drill on overload.
The drilling process can then be started and
continued as described above.
NOTE
The wet diamond drill also switches off if the
diamond core drill bit has insufficient cutting power.
In this case, check whether the diamond core drill
bit has become blunt (see "Handling wet diamond
core drill bits" on page 46).
6.6
Ending the drilling process
•
After drilling, allow the water to continue running
for a short time to flush out the drilling sludge
between the wet diamond core drill bit and the
drill core.
•
Turn the capstan handle counter-clockwise to
pull the wet diamond core drill bit slowly out of
the drillhole.
•
14
Switch off the wet diamond drill.
•
10
Turn off the water supply (1).
•
Switch off the water suction.
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