Drilling With A 600 Mm Core Bit; Switching The Machine Off - Hilti DD 30-W Manual

5. Press the machine's control switch and hold it in this position. Set the water regulation lever to the
desired water flow rate and then release the control switch.
Note
The water supply (water on/off) is controlled automatically by the machine's control switch. The
water flow rate can be preset by turning the water regulating lever before starting drilling or
regulated while drilling is in progress (minimum water flow rate when the regulating lever is in the
"closed" position is approx. 0.3 l/min).
6. Switch the machine on in sustained operating mode by pressing the control switch fully and then pressing
the switch lockbutton.
7. Turn the hand wheel until the diamond core bit is in contact with the working surface.
8. When beginning drilling, apply only light pressure until the core bit has centered itself and then increase
the pressure.
9. Increase the pressure against the working surface as soon as you feel that the core bit has centered itself
and is rotating smoothly.
10. Regulate the contact pressure while observing the drilling performance indicator.
Note
Adjust the pressure applied so that the machine continues to run at full speed. Optimum drilling
performance will then be achieved (the drilling performance indicator lights green). Higher contact
pressure will not increase the drilling performance (the drilling performance indicator lights red).
Note
Keep an eye on the water flow rate while drilling is in progress. Check the water flow rate indicator.

6.3 Drilling with a 600 mm core bit

1. Start the hole by predrilling with a 300 mm core bit.
WARNING
Risk of injury. Drilling with the 600 mm core bit without predrilling may cause loss of control of the
machine resulting in damage and injury.
▶ Always predrill (use a shorter core bit to start the hole). Before continuing drilling, ensure that the
600 mm core bit is inserted all the way to the base of the predrilled starting hole.
2. After changing the core bit, keep the machine switched off and guide the 600 mm core bit into the
predrilled hole, all the way to the base of the hole.
3. Continue drilling.

6.4 Switching the machine off

1. Switch the machine off when the desired drilling depth is reached or when the through-hole has been
completed. If you are using the switch lock, release the lock by pressing the on/off switch.
WARNING
Risk of injury! The core, or pieces of it, may be hurled out if the water collector is lifted away from the
working surface while the core bit is still rotating. This presents a risk of injury.
▶ Lift the water collector away from the working surface only after the core bit has stopped rotating.
2. Withdraw the core bit from the hole as the machine slows down, but before it stops.
◁ The water supply (water on/off) is controlled automatically by the machine's on/off switch.
24 English
Printed: 06.07.2017 | Doc-Nr: PUB / 5283534 / 000 / 05