Environmental Conditions; Electronic Devices - Berner BDIAW 3420-300 Manual De Usuario Y De Seguridad

The minimum number of bolts you must use to fasten your
drill motor is written on the Technical Data sheet.
Fastening the work piece and size of the
work piece
▪ if the work object is a block and not part of a
structure, fasten it in order to prevent its movement;
prevent the work piece from shifting, moving or
▪
falling when you are cutting.

Environmental conditions

don't expose the machine to rain, ice or snow;
▪
prevent water or any other liquid from coming into
▪
contact with the electric parts of your machine;
do not use the core drill in explosive atmospheres,
▪
for instance in presence of inflammable liquids, gas
or dust. The electric core drill motor produces sparks
which can ignite dust or smoke.
Overhead drilling (ceiling drilling)
You can perform overhead drilling (upward) when the core
drill is used in dry drilling mode.
Overhead drilling (upward) is not allowed when the core drill
is used in wet drilling mode.
Warning: the possible drop of the core can be
dangerous. Watch out!
Operating instructions
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 instructions
provided by the manufacturer of the drill stand;
if you want to operate in the wet mode, open the
▪
valve (C) (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 cannot 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
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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 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.
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 when the motor is on or helping
yourself with the motor.

Electronic devices

Your core drill motor is equipped with a 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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