Fitting The Water Supply Connection; Selecting The Speed - Hilti DD 350-CA Manual De Instrucciones

5. Use the hand wheel to tighten the eccentric pin
moderately in a clockwise direction.
NOTE The locking pin will shear if excessive force
is applied.
6. Pass the supply cord through the supply cord guide
on the opposite side of the carriage.
7. Check that the machine is mounted securely.

5.9 Fitting the water supply connection

NOTE
Before starting the core drilling machine, check that the
3-way valve is set to the position for wet drilling or dry
drilling.
1. Close the valve in the water supply hose.
2. Connect the water supply hose to the hose connec-
tor on the core drilling machine.
NOTE A flow meter, which is available as an acces-
sory, may be fitted between the machine's water
supply hose connector and the water supply hose.
5.10 Fitting the water collection system
(accessory) 12
NOTE
Use of the water collection system allows water to be
led away in a controlled manner, thus avoiding a mess or
damage to the surrounding area. We recommend, as a
general rule, that a water collection system is used with
core bits of up to 250 mm (10") in diameter. Best results
are achieved with a wet-type industrial vacuum cleaner.
When drilling overhead on ceilings, the drill stand must
be perpendicular to the ceiling (90°) and the sealing ring
must correspond to the diameter of the diamond core bit
used.
1. Release the screw on the front of the rail at the
hinged joint on the drill stand.
2. Slide the water collector holder into position under
the screw from below.
3. Tighten the screw securely.
4. Fit the water collector between the two movable
arms of the water collector holder.
5. Secure the water collector with the two screws on
the holder.
6. Connect a wet-type industrial vacuum cleaner to the
water collector or fit a length of hose through which
the water can drain away.
5.11 Fitting the diamond core bit (BL chuck) 13
DANGER
Fitting and positioning the core bit incorrectly can lead
to hazardous situations as this may cause parts to break
and fly off. Check that the core bit is seated correctly.
DANGER
Do not use damaged core bits. Check the core bits for
chipping, cracks, or heavy wear each time before use.
Do not use damaged tools. Fragments of the workpiece
or a broken core bit may be ejected and cause injury
beyond the immediate area of operation.
NOTE
Diamond core bits must be replaced when the cutting
performance and/or rate of drilling progress drops sig-
nificantly. This generally is the case when the segments
reach a height of less than 2 mm.
CAUTION
The core bit may get hot during use or during sharpening.
There is a risk of burning your hands. Wear protective
gloves when changing the core bit.
1. Disconnect the supply cord plug from the power
outlet.
2. Lock the carriage in position on the rail and check
that it is securely locked by turning the hand wheel
slightly.
3. From below, push the connection end of the dia-
mond core bit into chuck on the core drilling ma-
chine, making sure that the teeth engage.
4. Close the chuck by turning it in the direction of the
closed brackets symbol.
5. Check that the diamond core bit is securely mounted
in the chuck. There should be no movement when it
is gripped and pulled.
6. WARNING The rotating core bit presents a risk of
injury! A rotating core bit that is lowered toward
the base material is capable of severing parts of the
body. After fitting the core bit, adjust the system in
order to reduce the distance between the core bit
and the base material to a minimum before switching
on the diamond coring machine.
Bring the core bit as close as possible to the
surface in which the hole is to be drilled. However,
it should not touch the surface.
5.12 Setting the depth gauge (accessory)
1. Turn the hand wheel until the diamond core bit is in
contact with the surface in which the hole is to be
drilled.
2. Set the desired drilling depth by adjusting the dis-
tance of the depth gauge from the carriage.
3. Secure the depth gauge by tightening the clamping
screw.

5.13 Selecting the speed

1. Select the switch setting according to the core bit
diameter used.
NOTE The speed of rotation of the core bit can be
changed while drilling is in progress.
en
11