Operating Instruction DD 500-CA (01)

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6 The core drilling operation
CAUTION
The AC supply voltage must correspond to the voltage
rating given on the type identification plate.
DANGER
Have the earth / ground conductor installation in the
mains supply and the earth / ground connection in the
machine checked at regular intervals.
WARNING
Take care to ensure that the supply cord does not come
into contact with rotating parts.
WARNING
Make sure that the supply cord is not pinched and dam-
aged as the carriage advances.
CAUTION
The machine and the drilling operation generate noise.
Wear ear protectors.
Excessive noise may damage the hearing.
CAUTION
Drilling may cause hazardous flying fragments.
Flying fragments present a risk of injury to the eyes and
body.
Wear eye protection and a hard hat.
DANGER
When drilling through walls, secure (cordon off) the area
behind the wall, as material or the core may fall out on
the other side of the wall. When drilling through ceilings,
secure (cordon off) the area below as drilled material or
the core may drop out and fall down.
CAUTION
Take care to avoid touching rotating parts when regulat-
ing the water flow while the machine is running.
6.1 Keep everything clear of the danger zone
The shaded area in the illustration indicates the danger
zone around the core drilling machine. Stay clear of the
core bit when the machine is in operation (keep a distance
of at least 15 cm (6")).
6.2 Starting a hole using the hole-starting function
NOTE
Pay attention to the information in this section in ad-
dition to the information about the various core drilling
applications.
Strong vibration may occur when starting a hole. Use the
hole-starting function if strong vibration is experienced.
1. 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.
2. Press the “On” switch on the core drilling machine.
3. Press the “On” switch a second time.
The core bit then rotates very slowly (approx.
21/min).
4. Press the core bit firmly against the working surface.
5. After a short hole-starting phase (approx. 5 s), press
the “On” switch again.
The core bit will then rotate at normal speed.
6. Continue the drilling operation in accordance with
the instructions given in the subsequent sections.
6.3 Procedure when rebars are contacted
NOTE
If the rate of drilling progress becomes slower, this may
indicate that a rebar has been contacted. On contact with
rebars, the following procedure is recommended:
1. Press the rebar (“Iron Boost”) button.
2. Press the rebar button once more when the rate of
drilling progress again increases, indicating that the
core bit is again drilling through concrete. The Iron
Boost function is then deactivated.
NOTE Use the Iron Boost function only when drilling
in heavily reinforced concrete. To avoid shortening
core bit life unnecessarily, switch the Iron Boost
function off again each time after drilling through
rebars.
6.4 Various applications
In this section, the following types of application are
described:
Wet drilling without use of a water collection system
en
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Printed: 12.11.2015 | Doc-Nr: PUB / 5236316 / 000 / 01