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•
12
Open water supply (1) slightly.
•
Set water suction to continuous operation.
NOTE
If the wet drilling system is operated without water
extraction, you must ensure that the escaping
cooling water is collected and does not cause any
damage.
•
Release the spindle head – if locked:
6
BST 250
f
Release the clamping lever (1); the spindle
head (2) is now freely movable once again.
BST 420
7
f
Pull the locking pin (2) in the spindle head (1)
out of the feed shaft, turn through 90° and
allow it to latch into position. To do this, it
may be necessary to move the spindle head
(1) up or down slightly using the feed crank
handle. The spindle head (1) is once again
freely movable.
•
3
Turn the capstan handle (5) in a clockwise
direction to slowly immerse the diamond core
drill bit into the material to be drilled – the green
LED (BDB 835: Item 6, see Figure
BDB 8325: Item 6, see Figure
out.
•
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).
•
If the feed is too fast, the red LED (BDB 835:
Item 7, see Figure
1
Figure
2
) lights up. Then, immediately reduce
the feed until the green LED (BDB 835: Item 6,
see Figure
1
and BDB 8325: Item 6, see
Figure
2
) lights up again.
If this warning signal is ignored, i.e. the feed is
not reduced, the electronics switch off the drive
unit on overload.
The drilling process can then be started and
continued as described above.
1
and
2
) must not go
and BDB 8325: Item 7, see
NOTE
The drive unit also switches off if the wet 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).
5.9
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.
•
3
Turn the capstan handle (5) counter-clock-
wise to pull the wet diamond core drill bit slowly
out of the drillhole.
•
1
/
2
Switch off the drive unit at the ON/OFF
switch (BDB 835: Item 8 see Figure
BDB 8325: Item 8, see Figure
•
12
Turn off the water supply (1) at the tap (2).
•
Switch off the water suction.
Through-hole
NOTE
Risk of deformation or fracture!
Do not hit the diamond drill bit with hard objects!
If the drill core is stuck in the diamond core drill bit,
knock the diamond core drill bit with a soft piece of
wood or plastic to loosen the drill core.
Non through-hole (blind hole)
NOTE
The diamond core drill bit can be damaged irrepa-
rably if it is jammed in the core drill hole.
Never use the diamond core drill bit to break out
the drill core!
•
16
If the drill core is still stuck in the drill
hole after the diamond core drill bit has been
removed, it can be broken out using a suitable
tool (e.g. chisel).
1
and
2
).
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