CARDI DIAMOND PULSE-TECH Sicherheits- Und Betriebsanleitung Seite 17

10
Drilling technique choice
Choose one of the following drilling techniques according to
the drilling you have to perform. The following hints help you
to choose.
Hand held dry drilling
This drilling technique:
▪
is suitable for drilling into abrasive materials like,
bricks, masonry, gasbeton, poroton, etc;
▪
is not recommended to drill concrete (reinforced or
not reinforced);
▪
is not recommended when using the Roto-
Percussion mode (see chapter "Rotative and Roto-
Percussion modes").
▪
the industrial vacuum cleaner must be suitable for
thin dust;
▪
always wear a dust mask when performing dry
drilling.
Hand-held wet drilling
▪
wet drilling means that you drill with water coming
out of the core bit removing the drilling dust. The
water comes into the core drill through a hosepipe
connection;
▪
this technique is suitable for holes into compact and
hard materials like concrete (reinforced or not
reinforced), bricks, stone, stone-like materials etc.
when the diameter of the hole is below 80 mm and
depth below 400 mm;
▪
if your core drill has a maximum drilling diameter
below 80 mm, follow this value;
Drilling with a drill stand
This drilling technique:
▪
is safer and more effective than the hand-held
drilling technique;
▪
is suitable to drill into any kind of material;
▪
allows you to drill in Rotative and Roto-Percussion
modes for longer time than hand-held.
The use of a proper drill stand with "vibrations suppression
feature", is highly recommended.
Always follow the instructions given by the drill
stand manufacturer.
Rotative and Roto-Percussion modes
Your core drill can be used in two modes:
▪ "Rotative mode";
▪ "Roto-Percussion" mode: while is rotating, the core
bit is also moved forward and backward, generating
impacts on the material you are drilling (fig. 2).
You can select the mode by operating the selector as shown
in figure 4.
Warning: The Roto-Percussion mode is not
recommended when drilling hand-held, due to
the vibration level the user is exposed to.
Devices to reduce vibrations
Core drills and more in general every power tool, expose the
user to vibrations that could be dangerous for the health if
prolonged and repeated for significant lengths of time.
The European Directives and Standards for Safety define
limits to time and level of exposure of workers to vibrations.
The employer is responsible for the safety and health of his
workers and he has to evaluate the daily vibrations
exposure, taking action when the limits are exceeded.
08-2021
To reduce the worker's exposure to vibrations, CARDI offers
specifically developed devices.
Ask your dealer for more information.
Dust suppression
▪
Dry drilling is safer and more effective if dust is
removed by a proper vacuum cleaner;
▪
the core drill is equipped with an integrated dust
extraction system; just connect a proper vacuum
cleaner to the dust outlet;
▪
a proper vacuum cleaner must be suitable for
thin/fine dust;
▪
always wear a dust-mask when performing dry
drilling.
Power supply
Earth (Ground)
▪
the metallic parts of your core drill are connected to
the earth.
▪
make sure that the socket and possible extension
cords and multiple sockets have the earth
connection and that your electrical system is
properly connected to the earth.
Warning: for your safety, it is important that the
whole system (electrical system, extension
cords, sockets etc.) is connected to the earth. If
you are not sure, ask a qualified electrician for a
check
Extension cords
▪
when you have to operate with your core drill far
from an electrical socket, you can use an extension
cord. If you use it, make sure that the section of the
cord is suitable and that the cord is provided with
ground conductor;
▪
when an extension cord is needed, follow the chart
shown in figure 12 on this manual for the choice of
the right section of the conductors;
▪
the extension cord (made up of cable, plug and
socket) must be suitable for permanent outdoor use
and resistant to oil and grease (like as example
type H07RN-F);
▪
if you use more than one extension cord make sure
that every cable in each extension cord has a
section not lower than the value shown on the chart
in figure 12, considering the total length of the
extension cords;
▪
remember that the more an extension cord is long
the higher the voltage drop is and the worse is the
operation of your core drill. We suggest extensions
no longer than 60 meters.
PRCD: portable residual current device
(GFI)
▪
your core drill is equipped with a safety portable
residual current device (PRCD) assembled on the
cord. This device is shown in figure 8;
▪
never use core drill without PRCD;
▪
before starting to drill make sure the PRCD works
properly. In order to do so, plug the core drill in and
press the button Reset (O): the indicator appears
(P) showing that electricity is available to the core
drill. Then press the button Test (N) that tests if the
device works properly. When you press it the circuit
breaker inside the PRCD should cut the power off
leading the switch automatically to go to the off
position and the indicator to turn off;
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