eng
eng
1.8. Noise emissions
Workplace emission level
90 dB (A)
91 dB (A)
Operating sound level
103 dB (A)
104 dB (A)
1.9. Vibrations
Weighted effective value of
acceleration
2.5 m/s
2
2.5 m/s
2
2. Initial startup
2.1. Electrical connection
Before connecting the machine, check to ensure that the mains
voltage matches that indicated on the machine rating plate. Always
check the PRCD fault current-safety switch (19) for correct functioning
before starting up at the beginning of each session (see 3.).
2.2. ROLLER’S Centro S1 and ROLLER’S Centro S3 drive units
The ROLLER’S Centro S1 and ROLLER’S Centro S3 drive units are
universally applicable for both dry and wet drilling, either manually
controlled or with drill upright. The combined annular core bit connec-
tor on the drive spindle (11) allows the direct actuation of diamond
core drilling crowns with UNC 1
1
/
4
female thread and G
1
/
2
male
thread. Both drive units are delivered with a water supply system (15),
which requires connection before it can be used. The inlet for
connecting the drive unit water supply is sealed with a cap (14). The
drive units can be used for dry drilling when configured in this way.
For wet drilling, see 2.5.
The drive-unit turning speed required for cost-effective core drilling
depends on the diameter of the diamond core drilling crown. Select
the turning speed of the drive unit in such a way that the peripheral
speed (cutting speed) of the diamond core drilling crown runs within a
range between 2 and 4 m/s. It is of course possible to carry out drilling
operations outside this optimum range, albeit subject to reductions in
the operating speed and/or service life of the diamond core drilling
crown. Higher peripheral speed apply in masonry.
The turning speed of the ROLLER’S Centro S1 is adjusted to a fixed
setting. From a drilling diameter of 62 mm, the ROLLER’S Centro S1
operates in concrete in the optimum peripheral speed range, which
always remains inside acceptable limits when smaller diameters are
being handled. The attachment method used with the diamond-tipped
segments of the ROLLER’S Universal diamond core drilling crown
has been modified so that smaller diameters can also be drilled effi-
ciently with the ROLLER’S Centro S1.
The turning speed of the ROLLER’S Centro S3 can be selected by
means of a three-speed stepped drive to ensure that in concrete it
always operates within the optimum drilling speed range. The correct
speed can be taken from the machine rating plate (Fig. 7) of the
ROLLER’S Centro S3. The first column of the table shown there
covers speeds 1 to 3, the second column shows the corresponding
turning speeds, the third column the core bit diameters for masonry
and the fourth column contains core bit diameters for steel-reinforced
concrete. It shows, for example, that a Ø 102 mm core-drilling opera-
tion in masonry should be carried out in third speed, while drilling into
steel-reinforced concrete requires the use of first speed.
Important:
Wait for the machine to come to a halt before engaging
the transmission. Never try to do this during operation or outflow. If
you cannot engage a particular speed, turn the handle grip (39) and
rotate the drive spindle/diamond core drilling crown by hand at the
same time.
2.3. Universal diamond core drilling crowns ROLLER’S UDKB
The cutting characteristics of the diamond core drilling crown are de-
termined by the quality of the diamonds, the particle-size and shape
of the diamonds, and also by the bonding agent – the metal powder in
which the diamond particles are set. Users who need to carry out a
variety of core-drilling operations should keep a range of diamond
core drilling crowns of different sizes to hand in order to optimise the
cutting process. It is often only possible to ascertain onsite which dia-
mond core drilling crown is ideal, in terms of cutting performance
(operating speed) and service life, for a particular drilling task. You
may even have to contact the manufacturer of the diamond core dril-
ling crown on various occasions in order to find out which bit should
be used.
ROLLER has developed the Universal diamond core drilling crown for
use in common drilling operations. These bits are universally
applicable for both dry and wet drilling, either manually-controlled or
with drill upright. The connection thread of the ROLLER’S Universal
diamond core drilling crown UNC 1
1
/
4
is compatible with the
ROLLER’S Centro S1 and ROLLER’S Centro S3, and with suitable
drive units from other suppliers. If the connection thread proves to be
incompatible with the drive unit, special adapters are available as
accessories (22).
2.3.1. Fitting the diamond core drilling crown
Unplug from the mains power supply. Screw the selected diamond
core drilling crown onto the drive spindle (11) of the drive unit, and
lightly hand-tighten. There is no need to tighten it with a wrench. Note
that the threads on the drive spindle and diamond core drilling crown
must be clean.
2.3.2. Removing the diamond core drilling crown
Unplug from the mains power supply. Use an SW 32 wrench to hold
the drive spindle (11) and an SW 41 wrench to loosen the diamond
core drilling crown (48).
Always unscrew the diamond core drilling crown from the drive unit
when the drilling task is finished. With wet-drilling operations in parti-
cular, there is also a danger of the diamond core drilling crown beco-
ming corroded, making it difficult to remove.
Important:
The casing pipes of the diamond core drilling crown are
not hardened. Hitting (with tools) and impact (during transport) on the
casing pipe will lead to damage that is likely cause the diamond core
drilling crown and/or drilling core to become seized. The diamond
core drilling crown may then be rendered unusable.
2.3.3. Sharpening the diamond core drilling crown
ROLLER’S diamond core drilling crowns are supplied ready-sharpe-
ned. If feed pressure is kept at the correct level, the diamond-tipped
segments will sharpen themselves. Incorrect feed pressure can lead
to the diamond-tipped segments becoming „polished“, which causes
their cutting performance to diminish. If this occurs, use the diamond
core drilling crown to drill 10 mm to 15 mm into sandstone, asphalt or
a sharpening stone (available as an accessory) in order to sharpen
the diamond-
tipped segments once more.
2.4. Manually-controlled dry boring
Secure the holder-up (12) to the drill collar (13) of the drive unit.
Important:
Never carry out manually-controlled drilling without first
fitting the holder-up. DANGER OF ACCIDENTS!
The water supply system (15) gets in the way of manually-controlled
dry boring, and it should therefore be disconnected. Remember to
shut off the water inlet with its sealing cap (14) to prevent dust from
getting into the machine.
2.4.1. Tapping tool
Manually-controlled tapping is made considerably easier, thanks to
the ROLLER tapping tool (49). This is fitted with a conventional harde-
ned-metal Ø 8 mm masonry bit, which is secured in place with an SW
3 hexagon socket head wrench. The G
1
/
2
thread is used to screw the
tapping tool into the spindle of the drive unit, where it is gently tighte-
ned with an SW 19 wrench.
2.4.2. Dust extraction
We recommend the use of a dust extraction system to remove drilling
dust from the machine during core-drilling operations. This consists of
the ROLLER suction rotor for dust extraction (available as an acces-
sory) and a fine-dust suction extractor designed for industrial use. The
suction rotor (46) is screwed to the drive spindle (11) of the drive unit
using the G
1
/
2
connector. The combined annular core bit connector
(47) on the opposite side permits the fitting of diamond core drilling
crowns with female thread UNC 1
1
/
4
and the attachment of the
tapping tool (49).
If the dust produced by dry boring is not removed, the diamond core
drilling crown may overheat and suffer damage. There is also a
danger of the compressed drilling dust in the gap causing the dia-
mond core drilling crown to become blocked.