Operation - Hilti DD AF-CA Operating Instructions Manual

5.2 Making the electrical connection
1. Remove the protective caps from the socket and the connecting cable.
Fit the protective caps into each other in order to keep them clean.
2. Plug the connecting cable into the socket.
5.3 Ensuring supply of cooling water
The drilling feed unit and the diamond core drilling machine are water-cooled tools.
Make sure that the water inlet of the drilling feed unit's cooling circuit is correctly connected to a water
hose at all times during operation. This also applies when dry drilling operations are carried out.
Make sure that the minimum water flow rate and the water temperature meet the requirements stated
in the technical data.
6

Operation

6.1 Performing the core drilling operation
DANGER
Risk of injury due to failure to observe the danger zone! The drilling feed unit is always in Cut Assist mode
immediately after being switched on and it starts the drilling process automatically as soon as the switch on
the diamond core drilling machine is pressed. The core bit is automatically advanced until it contacts the
surface of the object to be drilled.
▶ Make sure there is no-one in the danger zone!
▶ Keep the zone between the core bit and the surface of the object to be drilled clear!
IMPORTANT! The emergency stop function does not work if the drilling feed unit is not connected to
the diamond core drilling machine!
IMPORTANT! Switching other power tools, machines or appliances on and off can cause undervoltage
dips and/or overvoltage peaks, resulting in damage to the product. Never operate other power tools
or appliances off the generator or transformer at the same time!
6.2 Working principle, CUT ASSIST
In CUT ASSIST mode, the drilling operation starts after you press the
machine. The drilling operation consists of 3 phases:
1. The core bit is advanced at a standstill until it comes into contact with the surface of the object to be
drilled. The system detects contact with the surface and retracts the core bit slightly so that it is clear of
the surface.
2. The cooling water starts to flow and the core bit starts rotating at low hole-starting speed.
3. The core bit advances into contact with the surface and the system drills at hole-starting speed until the
appropriate hole-starting depth is reached.
When the appropriate hole-starting depth is reached the system continues drilling, automatically adjusting
to optimum speed and optimum power.
If the core bit hits reinforcement, the Iron Boost function is activated automatically. Power is adapted for
cutting through the reinforcement. Weak reinforcement might not be detected under certain circumstances,
in which case the Iron Boost function is not activated.
6.2.1 Hole starting with small diameters
For core bits of diameter < 202 mm (< 8 in), it is advisable to start the hole with very low pressure and the
preset drilling speed.
→ After the core bit starts to rotate (phase 2), press the
6.2.2 Hole-starting in existing guides in the object to be drilled
If the core bit has a guide to follow in the object to be drilled, it is advisable to skip the hole-starting stage
and proceed right away to drilling with optimum power and speed.
→ After the core bit starts to rotate (phase 2), press the
10 English
Printed: 22.05.2019 | Doc-Nr: PUB / 5236039 / 000 / 03
button on the diamond core drilling
button on the diamond core drilling machine.
button on the diamond core drilling machine.