Hilti DD AF-CA, Original Operating Instructions

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*2077904*
2077904 English 21
3. Position the drilling feed unit on the carriage.
Make sure that the drilling feed unit is in uniform, all-round contact with the carriage. If necessary,
adjust the position of the carriage until the drilling feed unit is in correct, uniform contact.
4. Insert the fastening screw through the carriage and into the drilling feed unit.
5. Tighten the securing screw by hand.
6. Remove the hand wheel.
7. Connect the water hose to the diamond core drilling machine.
8. Connect the water supply to the drilling feed unit.
9. Check the mechanical connection between the drilling feed unit and the carriage.
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.
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Make sure there is no-one in the danger zone!
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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 with the core bit advancing until it is in contact with the
surface to be drilled. The core bit does not rotate while this is taking place. As soon as it touches the surface,
the core bit retracts a short distance.
The core bit then begins to rotate slowly (starting speed). The system switches on the water supply and
drills at low speed until adequate hole-starting depth is reached. Once the required starting depth has been
reached the system continues drilling at the optimum speed and with optimum power.
If the core bit touches reinforcement in the concrete, the Iron Boost function is activated and power is
adapted for cutting through the reinforcement. Weak reinforcement might not be detected by the drilling
feed unit, in which case the Iron Boost function is not activated.
When drilling a blind hole (not all the way through), the drilling feed unit stops the advance movement as
soon as the carriage contacts the depth gauge.
Printed: 06.02.2019 | Doc-Nr: PUB / 5209129 / 000 / 06