Hilti DD 350-CA Mode D'emploi page 37

1. If you are working without a spacer, the anchor for
the base plate should be set, as far as possible, at
a distance of 330 mm (13 ") from the center of the
hole to be drilled.
NOTE The optimum distance is 330 mm (13 "). If a
spacer is used, this distance increases.
2. Screw the anchor spindle into the anchor.
3. Place the drill stand over the anchor spindle and then
use the hole center indicator to position it correctly.
NOTE If a spacer is fitted, the hole center indicator
cannot be used to position the drill stand.
4. Screw the clamping nut onto the anchor spindle,
leaving it loose enough to allow movement of the
base plate.
5. Level the base plate by turning the 3 leveling screws.
Use the 2 leveling indicators on the carriage as an
aid. Take care to ensure that the leveling screws
make firm contact with the underlying surface.
6. Use a 27 mm AF open-end wrench to tighten the
clamping nut on the anchor spindle.
NOTE Do not use a hammer or other heavy object
when tightening the nut as this can damage the base
plate. The brace can be released and folded out of
the way to allow better access. Before operating the
machine, however, the brace must be refitted and
securely attached to the rail.
7. Make sure that the drill stand is fastened securely.
5.4 Fastening the drill stand with the vacuum base
plate 7
DANGER
A coated, laminated, rough or uneven surface may signi-
ficantly reduce the effectiveness of the vacuum system.
Check whether the surface is suitable for use of the
vacuum method to fasten the drill stand.
CAUTION
Suitable for use only with core bits ≤ 300 mm in
diameter and without the use of a spacer.
DANGER
Overhead drilling with the machine secured by the
vacuum base plate is not permissible.
NOTE
A vacuum valve, which can be used to release the va-
cuum, is fitted to the hand grip on the vacuum base
plate.
Check the condition of the seal on the vacuum base plate
at regular intervals and replace it if it is worn or damaged.
The vacuum base plate is available as an accessory.
1. Turn the four leveling screws until they project ap-
proximately 5 mm beneath the vacuum base plate.
2. Connect the vacuum connector on the vacuum base
plate to the vacuum pump.
3. Place the drill stand on the vacuum base plate.
4. Fasten it securely using the screw and washer sup-
plied.
5. Locate the center point of the hole to be drilled.
6. Beginning at the center point of the hole to be drilled,
mark out a line with a length of approx. 800 mm in
the direction of where the core drilling system is to
stand.
7. At a distance of 165 mm (6 ½") from the center point
of the hole to be drilled, make a mark on the 800 mm
long line.
8. Bring the indicator marks on the vacuum base plate
into alignment with the 800 mm long line.
9. Align the middle of the front edge of the vacuum
base plate with the mark at 165 mm (6 ½") on the
line.
10. CAUTION Make yourself familiar with informa-
tion contained in the operating instructions for
the vacuum pump and follow these instructions
before using it.
Switch on the vacuum pump and press the vacuum
release valve.
11. Adjust the position of the drill stand while keeping
the vacuum release valve pressed in. Release the
valve as soon as the drill stand is correctly po-
sitioned. Press the drill stand against the working
surface.
12. WARNING Before beginning drilling, during
drilling and until the core drilling system is
dismantled, it must be ensured that the pressure
gauge indicator remains within the green area.
WARNING The anchor base plate cannot and
should not be leveled on the vacuum base plate.
Level the vacuum base plate by turning the four
leveling screws.
NOTE The two leveling indicators incorporated in
the carriage serve as an adjustment aid.
13. An additional means of securing the drill stand must
be used when drilling horizontally. (e.g. a chain at-
tached to an anchor, etc.).
14. Make sure that the drill stand is fastened securely.
5.5 Setting the drilling angle on the drill stand 8
The drilling angle can be adjusted to a maximum of 45°.
CAUTION
At the hinged joints on the drill stand there is a risk of
crushing the fingers. Wear protective gloves.
1. Loosen the bolt at the top end of the brace and at
the pivoting joint at the bottom end of the rail.
2. Adjust the rail to the desired angle.
NOTE The angle scale at the rear serves as an
adjustment aid.
3. Tighten the bolt at the top end of the brace and at
the pivoting joint at the bottom end of the rail.
5.6 Extending the rail 9
CAUTION
When starting holes use only core bits or extended
core bits with a maximum total length of 650 mm.
1. Remove the protective end cap with built-in end
stop from the top end of the rail.
en
29