Hilti DD 30-W Manual De Instrucciones página 49

6.1 Hand-guided drilling
WARNING
Risk of electric shock! If the machine is used for hand-guided drilling in an upwards direction without the
necessary safety precautions, water may enter the machine and present a risk of electric shock.
▶ When carrying out hand-guided drilling in an upwards direction, always use a water collection
system with a wet/dry industrial vacuum cleaner and the spray guard.
WARNING
Danger of electric shock! Use of the wrong sealing ring when drilling overhead may cause water to find its
way into the interior of the diamond core drilling machine.
▶ Always use a sealing ring of the same diameter as the core bit.
1. Plug the drilling machine's supply cord into a power outlet or, if using a vacuum cleaner, into the power
outlet on the all-purpose vacuum cleaner (if the vacuum cleaner is equipped with a power outlet).
2. If using a vacuum cleaner, plug the vacuum cleaner supply cord into the electric supply socket and set
the switch on the vacuum cleaner to the AUTO or ON position (i.e. the I position).
3. Switch on the ground fault circuit interrupter (PRCD) (see → page 37).
In AUTO mode, the vacuum cleaner starts automatically with a delay after switching on the drilling
machine. When in AUTO mode the vacuum cleaner continues to run for a short time after the
drilling machine is switched off, before switching itself off automatically. When set to ON or I, the
vacuum cleaner requires to be switched on and off manually.
4. Mark the center of the hole to be drilled with a cross. The lines of the cross should be longer than the
diameter of the water collector.
The water collector has four protruding marks that can be aligned with the cross.
5. Press the drilling 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.
The water supply (water on/off) is controlled automatically by the drilling 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. Position the water collector carefully at the position where the hole is to be drilled, without bringing the
core bit into contact with the working surface.
7. Bring the four marks on the water collector into alignment with the lines marking the center of the hole to
be drilled.
8. Check that the core bit is not in contact with the working surface and then press the control switch half
way (this activates hole-starting speed).
9. If you are drilling upwards, wait until the core bit has filled with water.
➥ This will help to ensure that the core bit is cooled and avoid damage cause by dry drilling.
10. Press the core bit gently against the working surface.
➥ After switching on (pressing the control switch half way), the drilling machine runs at the slower
hole-starting speed in order to reduce the tendency of the core bit to "wander" when starting the
hole.
11. Press the control switch fully as soon as the core bit begins to bite and drill smoothly.
➥ The core bit can rotate at maximum speed as soon as the control switched is pressed fully.
Adjust the pressure applied so that the drilling machine continues to run at full speed. Optimum
drilling performance will then be achieved (the drilling performance indicator lights green).
Application of higher pressure will not increase the rate of drilling progress (the drilling performance
indicator lights red).
Guide the core bit carefully, keeping it straight in the hole. Tilting the core bit in the hole may result
in reduced drilling performance.
Always take care to ensure that the water flow rate is set correctly. Check the water flow by
keeping an eye on the flow rate indicator.
*2048397*
Printed: 04.07.2019 | Doc-Nr: PUB / 5283477 / 000 / 06
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2048397 English 39