Hilti DD 350-CA Manual De Instrucciones página 41

8. Increase the pressure applied to the core bit until
the drilling performance indicator lights green.
6.5.3 Dry drilling
To extract the drilling dust use a suitable dust removal
system consisting of a water collector and seal of the
correct, corresponding diameter (available as accessor-
ies), the appropriate connector and a vacuum cleaner.
The dust extraction process must be assisted by a flow
of compressed air through the core bit. The air flow rate
for this purpose must be at least 30 l/s.
NOTE
Wear respiratory protection when working in dusty con-
ditions.
The dust removal system and the compressed air supply
must be switched on.
6.5.3.1 Starting a hole using the dry drilling
technique
1. Set the 3-way valve on the core drilling machine to
"Dry drilling".
2. Open the water drainage plug so that the cooling
water can flow out.
3. Switch on the water supply.
4. Open the water flow regulator slowly until the desired
water flow rate out of the water drainage outlet is
achieved.
5. Make sure that the core bit is not in contact with the
working surface.
6. Press the "On" switch on the core drilling machine.
The core bit begins to rotate.
7. Release the carriage locking mechanism while hold-
ing the hand wheel securely.
8. Turn the hand wheel until the diamond core bit is in
contact with the work surface.
9. When starting the hole, apply only light pressure
until the diamond core bit has centered itself.
NOTE When the pressure applied is low, the drilling
performance indicator lights orange.
10. Increase the pressure applied to the core bit until
the drilling performance indicator lights green.
6.6 Completing the drilling operation 16
CAUTION
Heavy cores present a risk of injury. Take great care when
handling heavy cores. Be careful to avoid getting your
fingers trapped and crushed. Use a lifting aid or obtain
help.
1. Press the "Off" switch on the core drilling machine.
2. Turn the hand wheel to lift the diamond core bit out
of the hole.
3. Lock the carriage in position.
NOTE The carriage is locked when the locking pin
is engaged.
In this position, no movement of the carriage is
possible.
4. Check that the carriage is locked by trying to turn
the hand wheel slightly.
5. Close the water flow regulator.
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6.
7.
8.
9.
6.7 Procedure in the event of the core bit sticking
The safety clutch releases in the event of the core bit
binding and sticking. Following this, the motor is switched
off by the electronic control system. The core bit can be
released by taking the following action:
6.7.1 Using an open-end wrench to release the
1.
2.
3.
4.
6.7.2 Releasing the core bit with the hand wheel
1.
2.
3.
4.
6.8 Removing the diamond core bit 17
CAUTION
The core bit may get hot during use or during sharpening.
There is a risk of burning your hands. Wear protective
gloves when changing the core bit.
1.
2.
3.
4.
5.
6.9 Removing the core drilling machine from the
1.
Switch off the vacuum cleaner (if used).
When ending an overhead drilling operation, first
drain the water out of the core bit. To do this,
remove the water drainage plug, connect a water
drainage hose (accessory) to the water outlet and
then turn the 3-way valve to the middle position.
Disconnect the supply cord plug from the power
outlet or switch off at the PRCD (ground fault circuit
interrupter).
Remove the core.
core bit
Disconnect the supply cord plug from the power
outlet.
Grip the core bit with a suitable open-end wrench
close to the connection end and release the core bit
by rotating it.
Plug the core drilling machine's supply cord into the
power outlet.
Resume the drilling operation.
Disconnect the supply cord plug from the power
outlet.
Lift the core bit out of the hole by turning the hand
wheel.
Plug the core drilling machine's supply cord into the
power outlet.
Resume the drilling operation.
Disconnect the supply cord plug from the power
outlet.
Lock the carriage on the rail.
Check that the carriage is locked by trying to turn
the hand wheel slightly.
Turn the chuck in the direction of the open brackets
symbol.
Remove the core bit.
drill stand 18
Disconnect the supply cord plug from the power
outlet.
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