Hole Starting With Small Diameters; Hole-Starting In Existing Guides In The Object To Be Drilled; Deactivating Automatic Break-Through Detection; Drilling With Cut Assist - Hilti DD AF-CA Manual De Instrucciones

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
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.
22 English
Printed: 22.05.2019 | Doc-Nr: PUB / 5209129 / 000 / 07
button on the diamond core drilling machine.
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