Hilti DD 250 Manual De Usuario página 23

5.5 Fastening the drill stand with the vacuum base plate (accessory)
DANGER
Risk of injury Hazard presented by a falling diamond core drilling machine.
▶ Fastening the drill stand to the ceiling only by means of the vacuum securing method is not
permissible. A heavy structural support or a threaded spindle, for example, can serve as an
additional means of fastening.
WARNING
Risk of injury Hazard presented by a falling diamond core drilling machine.
▶ When drilling horizontally, the drill stand must be secured additionally by a chain.
WARNING
Risk of injury Pressure check
▶ Before beginning drilling and during operation, it must be ensured that the pressure gage indicator
remains within the green area.
Note
Make sure that the anchor base plate lies flat against the vacuum base plate and that the two plates
are securely connected when using the drill stand with an anchor base plate. Screw the anchor base
plate securely onto the vacuum base plate. Make sure that the core bit selected for use will not
damage the vacuum base plate.
Before positioning the drill stand, ensure that there is sufficient space available for assembly and
operation.
Use the vacuum fastening method only together with core bits of up to 300 mm (12") in diameter and
when no spacer is fitted.
A vacuum release valve, which can be used to increase the vacuum again, is fitted to the hand grip on
the vacuum base plate.
1. Turn all leveling screws back until they project approximately 5 mm (1/5 in) 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. Fit the drill stand using the screw supplied with a washer underneath on the vacuum base plate and
tighten the screw.
Note
DD-HD 30: Use the thinner of the two washers supplied.
DD-ST 200: Use the thicker of the two washers supplied.
5. Locate the center point of the hole to be drilled. Draw a line from the center of the hole to be drilled
towards where the drill stand is to be positioned.
6. Make a mark on the line at the distance stated from the center of the hole to be drilled. Bring the middle
of the front edge of the vacuum base plate into alignment with the mark made.
Note
Take care to ensure that the base material on which the vacuum base plate is positioned is flat
and clean.
Ideal distance from the hole center for DD-HD 30: 165 mm (6 1/2 in)
Ideal distance from the hole center for DD-ST 200: 215 mm (8 1/2 in)
7. Switch on the vacuum pump, press the vacuum release valve and keep it pressed.
8. Once the drill stand has been positioned correctly, release the vacuum release valve and press the
vacuum base plate against the base material.
9. Level the vacuum base plate by turning the leveling screws. Use the leveling indicators for this purpose.
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