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NOTE
The ON / OFF switch must not be locked for hand-
held drilling.
•
Press the ON / OFF switch (3) to switch on
14
the wet diamond drill and wait 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.
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.
NOTE
The wet diamond core drill bit can become blunt or
irreparably damaged due to overheating.
The feed may only be as high as the wet diamond
core drill bit can wear away the material. Therefore,
do not exert too large a force on the wet diamond
core drill bit and avoid canting.
A suitable dust extractor must be connected to the
wet diamond drill.
•
Position the wet diamond core drill bit and drill
with a uniform, light feed pressure.
•
Always withdraw the wet diamond core drill bit
slightly in-between times, to rinse out the drilling
sludge.
NOTE
Speed electronics with LEDs are provided for the
BDB 817 only.
•
If the feed is too fast, the red LED (2) lights
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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 wet
diamond core drill bit has insufficient cutting power.
In this case, check whether the wet diamond
core drill bit has become blunt (see "Handling wet
diamond core drill bits" on page 46).
If the wet diamond drill is operated without water
extraction, you must ensure that the escaping
water is collected and does not cause any damage.
5.5
Ending the drilling process
NOTE
To avoid damage to the diamond segments,
do not switch off the wet diamond drill until the
rotating wet diamond core drill bit has been almost
completely removed from the masonry.
•
After reaching the required drilling depth, slowly
withdraw the wet diamond drill with the rotating
wet diamond core drill bit – the wet diamond
core drill bit remains in the centring suction
plate.
•
After drilling, briefly let the water continue
running to flush out the drilling sludge between
the wet diamond drill bit and the drill core.
•
Release the ON / OFF switch (3) to switch
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off the wet diamond drill.
•
10
Turn off the water supply (1).
•
Turn off the water extractor.
•
Pull the now stopped wet diamond core drill
bit out of the drill hole, and at the same time
remove the centring suction disc with it.
Remove drill core
NOTE
Risk of fracture of the wet diamond core drill bit's
cutting segments and/or damage to the drill.
Never use the wet diamond core drill bit to break
out the drill core!
•
15
Use a suitable tool (e.g. chisel) to break out
the drill core in the wall.
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