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After having followed the instructions given in the previous
paragraph Preliminary operations, follow these operating
instructions:
Warning: do not touch any moving parts of
your diamond drill when operating.
switch on the core drill motor, keeping the core bit
not in contact with the material to be drilled. After
this operation, using the moving system of the
stand, move the carriage with the core drill motor
and the rotating core bit closer to the material and,
pressing lightly, drill about 1 cm into the material.
This operation is very important because, if
correctly carried out, leads to a perfect centring and
makes drilling easier. In any case, refer to the
directions provided by the manufacturer of the drill
stand;
if you want to operate in the wet mode, open the
valve (the valve is open when the handle is parallel
to the water stream). The water should come out
from the centre of the core bit.
after the centring operation, increase the forward
speed. On one hand, a too low forward speed leads
to polishing of diamond sectors, decreasing their
drilling capacity. On the other hand, a too high
forward speed, leads to a quick segments wear.
when drilling, make sure that the rotation axis of the
core bit doesn't move and avoid any possible
movement of it. When the core bit rotation axis
moves, the friction between the wall of the hole and
the core bit leads to a considerable power loss.
This happens for example when the stand is not
firmly fastened to the material to be drilled.
if you can not continue drilling, you can make a new
hole around the old one (over-drilling), keeping the
same rotation axis. The diameter of the new hole
must be at least 15-20 mm bigger than the diameter
of the old one;
drilling materials containing wood, cork, rubber,
foam polystyrene can lead to problems moving
forward the core bit. If you have this kind of
problems, pull the core out of the hole and remove
all materials listed before that don't allow the core
bit to go on and then continue with drilling
operations;
in case the electric power goes off, set the switch to
the OFF position, in order to prevent the machine
from accidentally self starting;
Once the hole is completed, you should:
switch the motor off, keeping the water flowing;
using the moving system of the stand, pull the core
bit out;
stop the flow of water;
do not touch the core bit after performing a drill.
The core bit can be very hot and cause severe
burns;
Mechanical clutch and core bit jamming
be ready to turn the switch of your core drill motor
off, in case of a core bit jamming;
your BERNER core drill motor is equipped with a
safety mechanical clutch that comes into operation
in case of sudden stop of the core bit rotation.
Despite your drill is equipped with this device, you
must always be watchful and be ready to switch off
the motor.
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in case of jamming, after having switched the motor
off, try to unclamp the core bit using an hexagonal
spanner hocking on the core bit connection;
alternatively you can use a chain spanner, paying
attention not to damage the core bit.
Warning: do not try to unclamp the core
bit with the motor is on, or helping yourself
with the motor.
Electronic devices
Your core drill motor is equipped with a BERNER
multifunction electronic device that includes a soft-start and
an electronic clutch;
the soft-start allows the motor soft-start, reduces
current peak that occurs when you switch the motor
on, helps you when you begin drilling, allowing
gradual core bit rotation and avoiding jerks at your
arm, and allows you to use your core drill
connected to the household electric outlet equipped
with automatic switch;
the electronic clutch makes sure that the current
absorbed by your core drill, proportional to the
motor load, is below the safety upper limit and, in
case the current absorbed exceeds the limit, cuts
off power to the motor, preventing damage. When
the overload is over, the device gives back power to
the motor that begins working again;
if the electronic clutch operates frequently means
that the core drill is not used properly. Possible
causes can be a not suitable forward speed, an
excessive friction between the core bit and hole
wall or an excessive drilling depth.
Drilling deeper than the core bit length
If you want to make an hole deeper than the core bit length
proceed as follows:
drill till the end of the core bit;
pull the core bit out of the hole and remove the
core;
place a proper core bit extension between the core
bit and the core drill thread;
insert the core bit in the hole and proceed drilling.
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Periodic maintenance
at the end of the work, after having removed the
core bit, blow compressed air inside the rotating
motor in order to remove dust and powder. Do this
operation wearing protective goggles;
before starting any other cleaning, maintenance or
lubrication operation make sure that the core drill
motor is unplugged;
keep lubricate the core-bit shaft thread;
keep your core drill clean and dry, in particular its
handles;
never use solvents or other harsh chemicals for
cleaning your core drill motor;
after use put your core drill in a dry, safe and
inaccessible to children place;
gears are lubricated by lubricating oil and grease
which are suited for any external temperature. You
don't have to check the oil level or to fill it up.
always unplug the core drill motor during check or
replacement;
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