Hilti DD 120 Mode D'emploi page 14

NOTE
Hilti M12 metal expansion anchors are usually suitable for
fastening diamond core drilling equipment to uncracked
concrete. Under certain conditions it may be necessary
to use an alternative fastening method. Please contact
Hilti Technical Service if you have any questions about
en
secure fastening.
1. Set the anchor that is suitable for the material on
which you are working at the (ideal) distance of
203 mm (8") from the center of the hole to be drilled.
2. Screw the clamping spindle (accessory) into the
anchor.
3. Place the drill stand base plate over the spindle and
align it.
4. Screw the clamping nut (accessory) onto the spindle
but do not tighten it.
5. Level the base plate by turning the four leveling
screws. Take care to ensure that the leveling screws
make firm contact with the underlying surface.
6. Use a 19 mm AF open-end wrench to tighten the
clamping nut on the clamping spindle.
7. Make sure that the drilling system is secured reliably.
6.1.3 Fastening the drill stand with the vacuum
base plate
DANGER
A coated, laminated, rough or uneven surface may signif-
icantly reduce the effectiveness of the vacuum system.
Check whether the surface is suitable for use of the
vacuum method to fasten the drill stand.
DANGER
Overhead drilling with the machine secured only by
the vacuum base plate is not permissible.
CAUTION
Make yourself familiar with information contained in
the operating instructions for the vacuum pump and
follow these instructions before using it.
WARNING
Before beginning drilling and during operation it must
be ensured that the pressure gauge indicator remains
within the green area.
VACUUM
VACUUM
10
NOTE
When using the vacuum base plate: Screw the anchor
base plate onto the vacuum base plate.
1. Turn (retract) the 4 leveling screws until they project
approx. 5 mm beneath the combination base plate
or, respectively, the vacuum base plate.
2. Connect the vacuum connector of the combination
base plate to the vacuum pump.
3. Locate the center point of the hole to be drilled.
4. Draw a line approximately 800 mm in length from
the center of the hole to be drilled towards where
the drill stand is to be positioned.
5. Make a mark on the line at a distance of 203 mm
(8") from the center of the hole to be drilled.
6. Switch on the vacuum pump and press the vacuum
release valve.
7. Bring the mark on the combination base plate or
vacuum base plate into alignment with the line.
8. Once the drill stand has been positioned correctly,
release the vacuum release valve and press the base
plate against the base material.
9. Level and steady the combination base plate or
vacuum base plate by turning the 4 leveling screws.
10. An additional means of securing the drilling system
must be provided when drilling horizontally. (e.g. a
chain attached to an anchor, etc.)
11. Make sure that the drilling system is secured reliably.
6.1.4 Adjusting the drilling angle (optional for rails
with tilt mechanism)
CAUTION
There is a risk of crushing the fingers in the pivot mecha-
nism. Wear protective gloves.
1. Release the screw on the rail tilt mechanism.
2. Adjust the rail to the desired angle.
3. Retighten the screw securely.
6.1.5 Fitting the water connection
CAUTION
Regularly check the hoses for damage and make sure
that the maximum permissible water supply pressure
of 6 bar is not exceeded.
CAUTION
Make sure that the hose doesn't come into contact
with rotating parts.
CAUTION
Make sure that the hose is not pinched and damaged
as the carriage advances.