Hilti DD AF-CA Operating Instructions Manual page 15

6.2.3 Depth gage
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.
6.2.4 Automatic break-through detection
When through holes are drilled without use of a depth gauge, the core bit feed movement continues until the
core bit projects approx. 3 cm out of the exit hole.
At the end of the drilling operation, the core bit is automatically retracted until only the tip of the core bit
remains in the drillhole. The water supply is then shut off automatically.
6.2.5 Deactivating automatic break-through detection
You can deactivate automatic break-through detection, for example when you are going to drill very deep
holes or drill into heterogeneous materials with possible cavities.
The Iron Boost function remains active even when automatic break-through detection has been
deactivated.
WARNING
Risk of injury! Injury can result if someone is in the danger zone when the core bit breaks through. With
automatic break-through detection deactivated, after the hole has been drilled right through the material the
core bit continues to rotate and does not stop automatically.
▶ Make sure there is no-one in the danger zone.
▶ Fit the depth gauge.
1. Press the
button.
2. Simultaneously press the buttons
➥ The Carriage positioning LED indicator flashes.
➥ Automatic break-through detection is deactivated.
To reactivate automatic break-through detection, repeat steps 1 to 2 or switch the system off and
then on again.
6.3 Drilling with CUT ASSIST
WARNING
Risk of injury! The rotating hand wheel can cause injuries.
▶ Remove the hand wheel from the carriage before starting to drill with CUT ASSIST.
When CUT ASSIST is active and you press the
automatic power adaptation when reinforcement is contacted is switched off. As a result, until the end
of the drilling operation, you will then have to regulate drilling power manually when drilling through
reinforcing bars.
1. Activate the water flow by pressing the
➥ Water issues at the core bit.
2. Activate the CUT ASSIST mode by pressing the
3. Use the
button to adjust power, if necessary.
4. Start drilling as described in the section headed "Working principle, CUT ASSIST". → page 10
6.4 Drilling in manual mode
1. Press the
button.
➥ Water flow is activated and cooling water issues at the core bit.
2. Carry out by the drilling operation as described in the operating instructions for the diamond core drilling
machine.
Printed: 22.05.2019 | Doc-Nr: PUB / 5236039 / 000 / 03
and .
button on the diamond core drilling machine,
button.
button.
English 11