Hilti DD 350-CA Manual De Instrucciones página 22

6.5.2.1 Starting the hole
1. Switch on the water supply.
2. Open the water flow regulator slowly until the desired
water flow rate out of the core bit is achieved.
3. WARNING The rotating core bit presents a risk of
injury! A rotating core bit that is lowered toward
en
the base material is capable of severing parts of the
body. After fitting the core bit, adjust the system in
order to reduce the distance between the core bit
and the base material to a minimum before switching
on the diamond coring machine.
Bring the core bit as close as possible to the
surface in which the hole is to be drilled. However,
it should not touch the surface.
4. Press the "On" switch on the core drilling machine.
The core bit begins to rotate.
5. Release the carriage locking mechanism while hold-
ing the hand wheel securely.
6. Turn the hand wheel until the diamond core bit is in
contact with the work surface.
7. 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.
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 cor-
rect, corresponding diameter (available as accessories),
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.
14
WARNING The rotating core bit presents a risk of
5.
injury! A rotating core bit that is lowered toward
the base material is capable of severing parts of the
body. After fitting the core bit, adjust the system in
order to reduce the distance between the core bit
and the base material to a minimum before switching
on the diamond coring machine.
Bring the core bit as close as possible to the
surface in which the hole is to be drilled. However,
it should not touch the 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.
6. Switch off the vacuum cleaner (if used).
7. 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.
8. Disconnect the supply cord plug from the power
outlet or switch off at the PRCD (ground fault circuit
interrupter).
9. Remove the core.