Dental Machine C6 User manual

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Name Manual C6-EN
Revision Rev. 02
First issue 07 November 2017
Issue 05 April 2012
Authors G. L. and L. L.

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USER’S GUIDE
FOR USE AND MAINTENANCE
OF C6 MILLING CENTER
1. GENERAL INFORMATIONS
1.1 Foreword
Thank you for chosing the C6 milling centre by Dental Machine.
We ask you to read cerafully this manual and to keep in a safe palce close to the machine
itaself, so it will be on hand when you need it.
1.2 Symbols
In the following manual, symbols have been used to highlight situations of RISK / DANGER /
IMPORTANT INFORMATION. If they are not already familiar to you, please memorise them before
to read the Manual.
This symbol highlights dangerous situations, which, if ignored may
result in death or serious injury to people, to the machine or to the
environment.
This symbol indicates the need to take specific care when performing the
operation to avoid any injury or economic damages.
This symbol indicates technical notes or information, which, if ignored
may result in damage to either the machine or the manufactured product

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1.3 Definitions
PRODUCT = the involved C6 milling machine, whose serial number is shown on the CE label “CE”
applied to it
MANUFACTURER = Dental Machine srl (see later)
CLIENT = the person who uses the machine, either directly of through an employee of his company
and his in charge of security of the company
OPERATOR = the machine who is using the machine in a specific moment or who has to take care
of it; he must be properly trained
TRAINING = a specific training on how to use the machine, performed by the Manufacturer of by his
deputy
MANUAL = both this manual and all documents supplied with the machine and/or during the training,
on paper or digital support, which include:
1. User license of software CAM named “SUM 3D” produced by LAB srl from Cinisello
Balsamo (MI, Italy) and licenced by CIMSystem di Cinisello Balsamo (MI, Italy) Via
Monfalcone 3, Phone [phone], delivered on a USB key;
2. Manual ISO Ns – Next Step – Machine interface manual, developed by Promax Srl, Via
Newton, 5G – 50051 Castel Fiorentino (FI, Italy) - Phone [phone], which explains
user’s interface to the machine and action that the operator can perform by touch-screen
or keyboard plus mouse
3. Declaration of Conformity to EU regulations
4. Declaration of application of the CE label, which in the specific machine, with its serial
number
This Manual is the English translation of the original Italian Manual published by the machine
Manufacturer.
it must be read carefully - both by the Employer and Operator – before starting the machine, nad
then it must be carefully stored in a place not far from the machine.
ATTENTION: ISO-Ns is a software that uses a PC to drive a numerically controlled machine.
According to its OpenSource philosophy, it accepts changes by the user. In case of changes, it is
REALLY important to conserve the original version for future tests and an eventual renovation. The
user is responsible of all the changes caused to the program.

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1.4 Product
Dental milling machine specifically designed for the production of dental prosthesis, named “C6”.
Since the machine may change tool automatically, the security regulation applicable is the EN 12417
Machine tools – Safety – Machining centres (type C regulation, according to EN 292-1; thus it
overrides type A and B regulations in case of conflict).
1.5 Manufacturer
The machine is manufactured by:
Dental Machine s.r.l.
Registered office:
Piazza S. Francesco, 11
29022 BOBBIO (Piacenza) - Italy
Production plant:
Via dell’artigianato 15
29022 BOBBIO (Piacenza) - Italy
Phone [phone] - fax: [phone]
email: [e-mail]
If any further assistance is required, or for clarifications regarding any part of this Manual,
please contact the production plant and quote the serial number of the machine.
1.6 Certificate of Origin
This machine has been produced in Italy. On request, the manufacturer will provide the
proper documentation.
1.7 Applied regulations
The machine is specifically designed for the production of dental prosthesis, named “C6”.
Since the machine may change tool automatically, the security regulation applicable is the EN 12417
Machine tools – Safety – Machining centres.
The above is atype C regulation, according to EN 292-1; thus it overrides type A and B regulations
in case of conflict.

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1.8 Labelling
La rispondenza alla normativa suddetta è certificata
dall’apposizione di una targhetta metallica inamovibile sul
retro della macchina, del tipo indicato qui a fianco, che
sarà compilata incidendo sulla stessa i dati specifici della
singola macchina.
Si prega di prendere nota del numero di matricola e di
citarlo sempre in qualunque contatto col
1.9 CE certificate
In addition to the above label applied on the machine,
the Manufacturer delivers a declaration of conformity
to applicable EU regulations, as shown in the sample
picture.
1.10 Warranty
C6 milling machine is and industrial produc, so the usual EU regulations for warranty of
consumer products are not applicable.
The extension of warranty must be specified on the single sale contact or in a specific
addition to it.
In any case, warranty:
• is limited to the time specified in the contract;
• is limited to failures due to the assembly and components of the
machine itself, and nothing else;
• does not include any liability for any other damage, loss of profit and non-
fulfilment of client’s orders;
• does not refer to consumables (tools, disk, blocks, etc.);

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• does not apply to the electrospindle, since it may be damaged by
improper usage (e.g. not performing pre-heating before starting the
work).
Any repairing on the machine must be performed by the Manufacturer or a technician trained
and approved by it and using original parts from the Manufacturer.
Any use of non-original parts or repair by non-authorized technicians makes the warranty
null and void.
Usage of a CAM software different from those supplied by the Manufacturer – if not
specifically approved in writing by it - makes the warranty null and void and may cause
serious damages.
1.11 Needs for installation
The Client will provide a proper room for the installation of the machine and provide the
needed air supply as well as (if required) vacuum system connection.
Requirements are listed in Annex 1.
1.12 Copyright
This Manual is property of the Manufacturer who own the copyright. The copyright of other
components (ISO-Ns manual, etc.) belong to the specific company. It is for internal usage
of the Client and his trained personnel.
No part of this manual will be disclosed to third parties unless specifically authorized in
writing by the Manufacturer.
2. MACHINE DATA
2.1 General description

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The milling machine named ‘C6’ is a table machine designed to mill
prostheses, abutments, surgical stents and similar items – typically
produced by dental labs, - obtained by both soft raw materials (zirconium
oxide, PMMA PEEK, wax and similar) and hard materials (tipically Co-Cr
and Ti alloys) in the shape of a disc (blank).
With a suitable tool it can be used to grind, in alternative to the disks,
of small blocks of lithium disilicate and similar.
The machine is composed by a main unit, to be placed on a
suitable table, the liquid collection and recirculating pump, to
be placed just under the table, and an external cooling unit for
cooling of the spindle, that can be placed anywhere, more or
less at the floor level and a maximum of 4 metres from the
main unit, to which is connected thanks to two small flexible pipes.
The use of the machine is reserved to
professional Operators sufficiently trained
by the Manufacturer or his delegate.
At the end of the training program, the machine
operator will be granted a specific diploma as per
the figure on the right side.
2.2 Technical data
General data:
Type of machine: 5 axes milling machine (milling centre)
Model: C6
Serial number: SEE CE LABEL ON THE MACHINE
Year of manufacture: SEE CE LABEL ON THE MACHINE
Size and weight (main body):
height 950 mm (37.4’’)
front width 660 mm (26’’)
depth 1000 mm (40’’)
weight 230 kg (507)
Ground plane (not provided):
Minimum dimensions same as the machine
Typical ergonomic height 900 mm
Minimum payload 300 kg (600 lb)

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Electrical supply data:
Input voltage: 230 V AC (alternate current) ± 10%
Phases: single-phase (1P + N + ground)
Frequency: 50 Hz ± 1%
Full load current: 6.5 A
Max. short-circuit current: 10 kA
Electrical supply: the machine is designed to operate with TT, TN and IT power supply systems.
Before connecting the machine, check for the presence of an efficient grounding system, and
check the correct coordination of the differential protective devices with the grounding system; this
will ensure the efficiency of systems that protect against indirect contact. This operation must be
performed by properly trained personnel according to the specific regulations applicable in the
country of installation, such as CEI 64-8 and similar.
The supply from the electrical net is: monophasic tension 50 HZ, 230 Volt + Ground; maximal power
absorbed: 1,5 kW; internal nutrition of the auxiliary: 24 V in continue electricity.
Compressed air supply data:
Rated pressure: 7 bar (101,5 psi) ± 10%
Nominal flow rate (minimum): 150 litres/minute (40 USg/min)
Max. pressure: + 15%
Characteristics free from oil and moisture
Note: the machine has been designed to accomplish very long milling operations, therefore is
recommended to use an oversized compressor, better if screw type, designed to work 24 hours per
day, with oil and moisture filters.
Environmental operating conditions:
Room temperature: between +5° and +30°C
Relative humidity less than 90% at 20° C (50% at 40° C)
Altitude: up to 1,000 m
Environmental storage conditions:
Room temperature: between +5° and +40°C
Relative humidity: less than 90% at 20° C (50% at 40° C)
Altitude: up to 1,000 m
Minimum IP rating of electric component case: IP54

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The machine must be protected against exposure to strong radiation, both ionising and non-
ionising and from contaminants such as gas, corrosive gas, powders, acids, oils, chemical products,
detergents and any other product not specifically mentioned in this Manual.
The machine must be installed in a suitable environment (dental laboratory).
Classification of the machine and applicable regulations:
Classification: Milling machine A5 for dental technology laboratory.
The milling machine includes an automatic tool changer and has therefore been designed and built
according to the applicable EU “machining centre” standards, i.e. UNI EN 12417:2009 Italian version
(August 2010, which includes the errata dated March 2010).
The machine’s electrical equipment has been designed and built according to EU standard CEI EN
60204-1: 2006.
Properties of perishable materials, fluids and lubricants:
The machine is intended for the milling process of most materials for the production of dental
prosthesis both “soft” (as PMMA, PEEK, wax, zirconium oxide partially pre-sintered and simila) and
“hard (basically Co-Cr and Ti alloys), as well as for grinding hard materials (in blocks) such as lithium
disilicate and similar.
It is recommended to use the parameters suggested by the manufacturer of the material itself.
The machine is equipped with a system of automatic change of the tools, according to the job
required. All tools must have the same stem, either 4 mm or 6 mm according to the version of the
spindle.
Every material must be milled according to the Manufacturer's instructions. The machine is
predisposed to operate in dry mode, even with powdery materials, and in wet mode using a mix with
an aqueous base and vegetable oil lubricant such as Castrol Alusol XT FF with a ratio of 5% in
volume (50 cc per litre).
External cooling of the spindle requires circulation of a proper liquid. It is suggested to use 20%
denatured ethylene glycol (for example: Paraflu 11 or similar, a fluid used as an additive for
windscreen wipers in motor vehicles, or Paraflu Up or similar, a fluid used as an additive in radiators
in motor vehicles).
Linear guides and worm screws with ball recirculation systems are life long lubricated, as well as
the planetary gearboxes.
3. RECIPIENTS OF THE MANUAL
A copy of this Manual, either on paper or on CD, delivered to the Client with the G5 machine will be
given to the plant manager, who will make a copy to give to the machine Operator and maintenance
technician. All of these figures must read this Manual in its entirety.
A copy must be kept in a safe and easily accessible place – if possible close to the machine itself –
and will be cons This Manual must be read in its entirety and in order and all “Attention” / “Caution”

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/ “Important” notes must be carefully understood and memorised. Subsequently it will be sufficient
to consult the sections of relevance; for this reason some items are repeated in the different sections.
4. PURPOSE
The information contained in this Manual refers to the use of the machine as stated by the design
assumptions and its technical characteristics; provides instructions on transportation, handling,
installation, adjustment and use, staff training, maintenance, ordering spare parts and residual risks
related to its use.
The Manufacturer urges the Client to read this Manual IN ITS ENTIRETY upon receipt of the
machine and STRICTLY before performing any actions on the machine.
5. MACHINE LIMITATIONS OF USE
This machine is intended for professional use only and this Manual is designed to provide
instructions, indications and warnings necessary in order to know the machine, understand its
operating principles and limits of operation and in order to be informed on how to safely use the
machine.
These user instructions are to be considered an integral part of the machine and must be kept for
future reference until the machine is decommissioned.
The Client is responsible for compliance with the instructions contained in this Manual, as well as
any national and local regulations in the place of installation.
Should there be a conflict between the contents of this Manual and national / local legislation, the
national / local legislation will prevail.
In such case, the Client is kindly requested to notify the Manufacturer about the conflict in order that
the latter may verify and if necessary, correct the Manual.
It is understood that in no way can the Manufacturer be held responsible for any poor results
of machined parts and / or broken tools and / or damaged blanks, insofar as the Client is
responsible for the machine’s use and results largely depend on the choice of material and
milling strategies, which are beyond the control of the Manufacturer.
Although the milling machine can use files generated by any CAM software – provided they
are in a standard ISO format - the Client is requested to use only CAM software with a post-
processor SPECIFICALLY APPROVED BY DENTAL MACHINE, to prevent any uncontrollable
behaviour by the machine.

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Milling – even occasionally and using standard ISO formats - according to files generated by
a CAM (and/or post-processor) not approved by Dental Machine shall automatically make
void any warranty provided by the Manufacturer, unless the user proves beyond any
reasonable doubt that the failure is not due to the CAM and/or post-processor.
6. CONSERVING THE MANUAL
This Manual must be stored in a protected and dry place, away from dust and direct sunlight.
A copy of the Manual should be easily available for consultation in the proximity of the
machine or at the request of anyone needing to work on the machine.
If the Manual is damaged or lost, the Client may request a replacement copy from the Manufacturer,
quoting the serial number of the machine which is on the CE plate, riveted on the back of the
machine.
7. UPDATES, ADDITIONS AND REPLACEMENT
This Manual reflects the state-of-the-art at the time of the machine’s commercialisation and cannot
be considered inadequate if it is later updated according to new knowledge.
The Manufacturer reserves the right to update production and the Manual without the obligation to
update earlier production and manuals, except for exceptional cases relating to the health and safety
of people and things.
The Client may contact the Manufacturer to request any updates or additions to the Manual, which
shall be considered an integral part thereof.
If the Client wishes to receive further information or suggest improvements to this Manual, they must
contact the Manufacturer directly and quote the serial number of the machine (CE label).
If the machine is sold, the Client is requested to notify the Manufacturer of the new owner’s address
in order to support the transmission of any changes and / or additions to the Manual to the new user.
The Manufacturer informs the Client that it is relieved from any liability for damages due to:
• improper use of the machine;
• use contrary to the specific national / local rules in force ;
• incorrect installation;
• incorrect power supply, even due to sharp dips or spikes;
• serious maintenance deficiencies;
• modifications to the machine - including the use of CAM software - not
expressly authorised in writing by the Manufacturer;

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• use of spare parts (including blank holders) that are not original or not
suitable for the model
• total or partial failure to observe the instructions of this Manual ;
• exceptional events suffered by the machine, which may modify the
mechanical and / or electrical and / or electronic settings, even to a
marginal extent
8. DESCRIPTION OF THE MACHINE
8.1 Machinable materials
The milling machine G5 or "Granite 5-axis " is designed to perform milling on discs in both metal (Cr-
Co alloy, titanium grade 2 and grade 5, aluminium, Ergal) and softer materials such as zirconium
oxide, plastics (PMMA, PEEK,
etc.), waxes and the like (see item
27.2 ) .
The basic machine is set up to
work on discs with a diameter of
98.5 mm and a height of 10 mm to
30 mm. Discs with a thickness
greater than 10 mm must be
shaped with:
• an edge with a height of 10
mm at the centre of the
outer edge;
• tapering above and below
the edge, up to a diameter
no greater than 96.0 mm for the part exceeding the 10 mm step.
It is imperative that the 10 mm thick edge be positioned exactly in the median part of the thickness
(figure above).

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On request, the machine can be equipped with a piece
holder for machining on pieces other than the standard
disc, such as blocks with lithium disilicate (see above
figure). If blocks are used it is recommended to ask the
Manufacturer for the block holder specific to the blocks that
will be used.
The Client must not act as a makeshift machine manufacturer, inventing their own devices to
mill forms other than the circular disc described above, as this may cause damage to the
machine and people. Remember that any changes to the machine shall result in the loss of
CE conformity and consequently the nullification of the warranty.
Similarly, the Client must not use the machine for tasks different to those for which it has
been designed (milling/grinding materials in order to make prostheses, crowns, bridges,
abutments, bars, surgical stents, etc. and similar items for the dental sector). Any other
improper use will compromise the validity of the CE declaration of conformity and the
warranty will be consequently void.
If required by the Client, the Manufacturer will do its best to find a safe and economical
solution for any objects that need to be milled (for dental laboratories).
The milling / grinding process is made possible by:
1. an electrospindle that rotates on its axis, fitted with a milling /grinding bit at its end;
2. a system for the translation of the electrospindle itself along three Cartesian axes (X,
Y and Z); the Y axis is composed of two parallel axes since it is a gantry system;
3. a rotation system on two axes, one perpendicular to the other, to rotate the blank
holder and therefore the piece support, (conventionally referred to as the A and C
axes; angles of rotation: axis A = ± 30 ° ; C axis = 360 °).
In order to perform the machining sequence to obtain the desired workpiece, the spindle must be
able to use different types of tools in different sizes, depending on the material being worked and
the tool’s position in the operating sequence.
For this reason the machine is equipped with an automatic tool change system, controlled by the
CAM software that runs the machine, which can select the right tool from one of the 16 existing
tool positions.
Remember that the spindle’s maximum rotation speed is 60,000 rpm, i.e. 1,000 rotations per
second! Thus any taper used as a tool holder must be shaped and finished for such speed.
The Manufacturer therefore recommends the use of tool holders produced by the spindle
manufacturer.

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Remember that use of different tool holders, albeit of good quality, shall result in the loss of
conformity and the warranty will be consequently void.
8.2 Operating cycle
The following figure summarises the operating cycle, including both manual and automatic
operations:
The machine includes a numerical control with a suitable software, that controls the whole process
and allows the Operator to stop and restart it.
8.3 Components
The machine is comprised of the following elements:
1. main body;
2. side covers;

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3. support for workable material (blank holder), with two rotation movements (axes A and C);
4. spindle (or electrospindle) movement group on 3 Cartesian axes (axes: X, Y and Z);
5. milling spindle (or electrospindle);
6. control computer (external);
7. cutting fluid unit (esternal);
8. spindle cooling unit (external);
9. font door and front panel;
10. electrical panel (internal);
11. back fixed cover.
8.3.1 Main body
The body of the machine is made of in painted steel, it holds the whole machine; on its turn it is
supported by 4 small feet placed on the 4 corners of the machine. The framework, closed above and
below, has different functions:
a) to support the body of the machine, composed of two lateral panels in fiberglass, which close
laterally the machine and are blocked by screws, to prevent the access in improper
conditions;
b) to support the posterior panel and the lateral panels of the machine, blocked by screws, to
prevent the access in improper conditions;
c) to support the anterior dashboard, blocked by screws, to prevent the
access in improper conditions;
d) to support the anterior glass of the machine, which can be opened
to access to the machine and protected against access in improper
conditions;
e) to support all the internal moving parts and also the electrical panel.
In conditions of normal use, the access to the machine for charging /
removing the disk into the blank holder or of the tools into the tool holder
can take place only though the front door. For security, the opening is equipped with a sensor which
stops the machine in case of accidental opening.
It is always recommended to properly stop the machine from the governing PC / tablet of the
machine. In case of emergency, press the button EMERGENCY on the front of the machine before
opening the door.
8.3.2 Side cover
Both sides of the machine are closed with a fixed glass fiber panels, tightly connected to the body.
They may be removed only by maintenance / repair personnel of the Manufacturer or duly authorized
form him.
Side covers of this class of milling machines may be of different colours or may bear images
according to the client’s will.

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8.3.3 Blank holder
This has a circular shape and a recess with a diameter of 98.5 mm in which the blank is inserted.
This is then firmly secured to its support for machining using
a circular flange, which is placed into position and secured to
the support using special screws.
The support is assembled in such a way as to allow 2 different
movements around two perpendicular axes (normally named
axis A and axis C).
For a person that looks to blank from the front of the machine,
the “+” directions of the Cartesian axes is as shown by the
arrows in the side figure.
The blank holder includes also the tool holder, which can be
equipped with as much as 18 tools.
8.3.4 Spindle movement mechanism
Allows the milling spindle to move in its designated space, horizontally along the two X and Y axes
and vertically along the Z axis, through the use of motors and worm-screws.
For all three axes, none of the movement guide parts are visible from the outside insofar as these
are covered by sealed protective bellows to guarantee the long life of
the machine in the presence of zirconium oxide powders.
The +/- direction of each single axis is also shown by the specific label
applied on the front side of each axis.
The C6 milling machine has no belt in it: all movement are obtained
by direct coupling of the brushless motor
with the worm screw for the 3 linear axes
and with the planetary gearbox for the 2
rotary axes.
The C6 is equipped with optical encoder on
the 3 linear axes.

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A linear encoder consists of a graded precision
scale, fixed, and a movable cursor connected
to the spindle that provide higher precision to
the machine.
An axis can be moved in many different ways.
Simple machine, printers, plotters etc. use
motor and belts, with problems of stiffness and
precision.
Best movements are obtained by using a motor
connected to an endless screw, that transforms the rotation of the motor in linear displacement.
Il an “open-loop” system there is no check about the fact that the motor has rotated at the angle
specified by the controller, thus the error can be very large.
In usual “closed loop” systems, the motor includes an encoder that measure the actual angle or
rotation of the motor, and corrects it if need and it is enough precise for most jobs. However, by
working many hours, the endless screw will heat up and expand due to thermal expansion, and the
displacement of the axis is not any more the same as the start of the job.
Usage of linear encoders overcome this problem. In the C6 machine, the numerical control reads
1,000 times per second the actual position of the spindle (on the 3 axes), compares with the
theoretical position and corrects if needed. See following figure.
which when assembled on each axis often reads the real position of the specific axis on a 1-second
time scale (normally 1,000), acting retroactively on the motor that controls movement so as to
minimise the positioning error (closed loop operation).
The machine is normally fitted with 4 optical scales to control movement on the 3 axes ("gantry"
system: the Y axis is actually composed of 2 axes, with 2 movements, which work in parallel)-
If the machine is fitted with the scales, this error can be continuously displayed on the machine's PC
tablet (point 10.3.7).
If the machine is fitted with scales, each machine's manual will also include the precision
measurements of each single scale, taken by the manufacturer of the scales during each of their
commissioning. This diagram normally looks like the one shown to the side.
As a result, the machine is much more precise and precision is stable
in time, independently from the temperature of the environment, heating
or cooling system, etc. and from the working time of the machine.
All linear encoder are tested one by one to be sure that they meet the
precision need, and the test of each all of them are usually included in
the machine documents for the client (see picture).

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8.3.5 Milling spindle (or electrospindle)
This is the machine part that keeps the mill rotating during machining at
a speed defined by the software, which depends entirely on the type of
material being milled, the diameter of the tool and the type of machining
being carried out.
The electrospindle is a precision tool insofar as it must be able to rotate
at high speed without causing the spindle to vibrate and must be able to
withstand vibrations caused by contact between the bits and the milled
material.
Since it is a precision tool, it must be handled with care and it is essential
to:
a) perform the run-in cycle as instructed by the Manufacturer
(which is always performed by the Manufacturer at their factory
prior to the machine's commissioning);
b) perform the necessary pre-heating cycle with the machine
empty, prior to any machining.
Caution: the failure to perform a pre-heating cycle prior to the start of any
machining (unless immediately after a previous machining cycle) may
cause damages to the ceramic bearings of the spindle with immediate
breakage; and in any case it reduces the life of the spindle.
The spindle protects itself by a continuous flow of air toward outside.
Avoid us of compressed air when cleaning it, since it may draw chips
inside it. Also avoid any ultrasonic cleaning as well as any spaying on it.
The electrospindle installed on this machine is produced by:
Alfred Jäger GmbH
Siemensstrasse 8
D-61239 Ober Mörlen, Germany
Tel [phone]
[e-mail]
Unless otherwise indicated, the spindle model used is:
Z62-D460.93 S3
The manufacturer (see above) stated that the spindle conforms to:
• machinery directive 2006/42/EG
• low voltage directive 2006/95/EG
• electromagnetic compatibility directive 2004/108/EG
and it also conforms to the harmonised standard EN 14121 on machine safety and in particular to
part 1 (guidelines for risk definition).

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This spindle is specifically optimised for “heavy duty”
work and is the ideal for milling Co-Cr and Ti alloys
as in the dental CAD-CAM, which require high
torque at low rpm.
Since the G6 machine must mill all materials, the
maximum rpm is up to 60,000 rpm.
8.3.6 Control computer
The C6 control computer – which hold the file of the components to be machined and releases it in
block to the numerical control of the machine – is a desktop or portable PC or even a tablet; it is
connected to the machine by a standard Ethernet cable or Wi-Fi.
The operating system depends form the PC; usually is Windows 10 or his update.
This computer must be used according to the Manual ISO Ns – Next Step issued by Promax (see
“Definitions” above)
8.3.7 Cutting fluid unit
The unit consists in a pump and conduits that terminate with a nozzle
near the tool, used to spray the fluid onto the piece being machined; the
fluid is then collected into a bottom thank, placed on the floor under the
machine, that also holds the recirculation pump.
Wet machining is necessary on most hard materials - in particular
titanium and cobalt-chromium alloys - insofar as it cools both the tool and
the machined piece using a recirculating coolant. If the coolant contains
a portion of EMULSIFIABLE lubricating oil, it will also reduce the friction
created by contact with the cutting edge, thereby reducing tool wear and
minimising the generation of heat.
The same considerations can also be made when milling aluminium,
lithium disilicate and similar products.
When milling soft plastic materials (e.g. PMMA and similar), the use of a coolant significantly
improves both the texture of the milled part and its appearance, preventing the plastic from melting
due to friction and giving the piece a "pasty" look.
The coolant and cutting fluid is determined by the Client based on the type of machining and is
poured directly into the tray positioned on the floor under the machine.
If the selected strategy includes wet machining, the pump positioned in this tray will automatically
start following a command by the CAM software and will pump the fluid. It is not possible to activate
the pump unless its use has been contemplated by the strategy inserted into the CAM.
In the majority of cases, it is recommended to use a mix of distilled water supplemented by a
vegetable oil lubricant, for example Castrol Alusol XT FF or similar, in a ratio of approx. 5% of the

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INSTRUCTION MANUAL
Date: 05/04/2018
C6 milling centre
Page 20 of 65
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volume. Alternatively, mineral water with a low mineral salt content can also be used as the base. It
is not recommended to use water taken directly from the water main as this always has a high
limescale content.
Caution: some coolants may be toxic and/or flammable and/or irritating. Always carefully
read and follow the precautions indicated on the coolant packaging.
Caution: some metals (e.g. titanium and his alloys, aluminium and his alloys, etc.) may
produce flammable chips when milled. Use coolant for drilling of all metals, unless you are
sure that there is no risk of flammability (such as with Co-Cr alloys).
Caution: avoid using products that have a boiling point under 100 °C since the heat generate
by the working tip may generate flammable or toxic vapours.
If wet machining is not used for long periods of time (e.g. 2-3 weeks), the coolant oil may separate
and form mould on the surface. In this case it will need to be completely replaced, disposing of the
residue in accordance with the instructions of the oil producer.
8.3.8 Spindle cooling unit
Like all motors, the spindle generates heat which is then dispersed. In this case, due to the power
level and the need for compact dimensions, it was decided to use a coolant
that continuously recirculates between the spindle itself (generator) and a
special radiator (heat sink) in a closed loop circuit similar to that used in motor
vehicles. The coolant is always topped up in the radiator.
If necessary and to reduce noise levels, the radiator can also be positioned
a few metres (max 4) away from the machine.
The coolant recommended for use is distilled (or demineralised) water,
supplemented by 20% denatured ethylene glycol (for example: Paraflu 11 or
similar, a fluid used as an additive for windscreen wipers in motor vehicles,
or Paraflu Up or similar, a fluid used as an additive in radiators in motor
vehicles). To top up the coolant, unscrew the upper cap and pour in the
coolant, ensuring it doesn't leak (FILL in the figure).
However, the radiator must always be positioned in such a way that the coolant level can
easily be checked (LEVEL indicated by the arrow). The level must always be between the Min
and Max shown on the graded scale and the coolant must be topped up when needed.
Attention: some coolants may be toxic if ingested and/or flammable and/or irritating.
Always carefully read and follow the instructions reported on the label of the coolant and on
the manufacturer's technical data sheet