Laser machines - for bruting, sawing and engraving of diamonds - 60.01 Laser machine 1

Fine Work Diode Pumped Green Laser Machine

The Fine Work low loss Diode Pumped Green Laser Machine has been developed especially for diamond sawing, shaping and bruting. The laser have a long resonator in order to have a pulse with enough power to cut in the stone without having the risk of damaging the stones.

The diode pumped lasers benefits from the latest electronic developments. It allows the pulse shaping and power modulation during the whole process in order to minimise risks and adapt the power during the sawing.

Performances:

• The Green Laser Machine will cut up to 40 Carats in 8 hours.
• Thickness of 25 to 30 mm and more may be processed.
• Losses are between 1,2 to 2,0 % depending on the size and the shape of the diamond.

Description of the System.

• Colour flat panel monitor.
• Easy access to the working area.
• Instruction on the computer screen with laser status diagnosis.
• Adaptable standard programmes.
• Rugged construction in aluminium, compact and stable.
• Vision system mounted on the beam exit in order to control while working.
• Double side sawing cassette (Option).
• Shape cutting (Option).
• Parameter change in pause mode.
• High precision linear motor X-Y-Z positioning tables.
• The high precision power supply will control the diode temperature, diode peak current and voltage.
• Due to the very high conversion of the laser diodes the system works on a normal 220 volt plug.
• The total electrical consumption of the system is less than 1,5 kW.
  Laser Resonator.
• Laser medium Nd:YAG crystal.
  This laser unit has been developed for its specific use in the diamond industry.
• Long pulse configuration. Constant peak power configuration at high frequencies.
• The high power laser diodes have a nominal lifetime of more than 10.000 working hours.
• Closed resonator with easy access for diode change.
• Pulse shaping makes pulse modulation possible even at high frequencies.
• TEM00 mode. Higher beam quality and stability. Standard 10 W.
• Power tuning from low power to maximum power. Power monitoring (Option).
• Internal closed loop cooling circuit. Compact design, maintenance free operation.
• Low weight loss (1,2 – 2,0 %) and extremely low breakage level.

Technical details.

Laser Head	Hawk Green 532
Laser medium	Nd :YAG
Pumping	pumping diodes
Pulse generator	Internal Q-Switch
Wavelength	532 nm
Nominal Power	> 12 Watt
Power (6 kHz)	9 Watt
Rep. Range	1 to 50 kHz
Mode	TEM00
M2	<>
Peak power at 30 kHz	30 kW
Pulse width at 6 kHz	90 ns
Stability Pulse to pulse	3 %
Beam divergence	1 mrd
Beam Quality	1,2 M2
Pointing stability	30 µrad
Polarisation	Vertical

X-Y-Z high precision positioning tables with linear motors.

LMX2E	Special rigid aluminium frame with low profile
Weight of X-Y table	42 kg
End contacts	2 inductive PNP contacts on each end
Max. mechanical travel	X: 144 mm / Y: 179 mm / Z: 50 mm
Guidance linearity	± 2µm/250 mm
Smallest step resolution	0,5 µ
Repeatability	± 0,002 mm

Motion Controller.

Motors	HW synchronous motors
Number of axis	3 (X Y Z)
Max. Velocity	5 m/s
Max. Acceleration	100 m/sec2
Motion capabilities	point to point, linear, jog and two axis circular motion modes

Diamond Holders.
Cartridges for multiple vertical sawing, multiple horizontal sawing, multiple double side cutting and single stone holder for special work.

Vision system.
- Camera: High definition colour camera.
- Screen: Flat panel touch screen.

Motion controller.
- Controller : LDS800 stand alone type.
- Number of axis : 4: (X Y Z) +A.
- Motion capabilities: point to point, jog and two axis shape movement.

Standard Software.
Gemsaw Software 4 axis motion controller:
It offers the possibility to operate X-Y-Z table and one rotation axis.

Sawingsoftware.
- The software can perform a straight cut from point 1 to point 2.
- The sawing length is adjustable with the keyboard arrows.
- It is possible to block and unblock the X axis.
- The software supports two cameras with a field of view 1 mm2 and 30x30 mm.
- By choosing the camera 1. it is possible to find a stone, select the right stone and specify the sawing direction.
- By choosing the camera 2. it is possible to inspect the stone or a cut, to find the highest point or center of the stone and log on it.
- Whilst sawing:
- Possibility to interrupt the sawing process, inspect the stone and start again.
- Possibility to interrupt the sawing process, adjust the current depth of the stone and continue the sawing.

With the stone rotation option it is possible to saw the diamond till the specified depth, rotate 45°, 90° or 180° and continue the sawing process. This feature allows sawing the diamond from two sides with less sawing loss.

The Software allows the programming of a V-cut by selecting the sawing angle, exit width and the distance between the strokes and layers. In the properties the V-cut it is possible to select the repetition of the passes on the edge of the V-cut.
One can also choose the shape of the V-cut (centre, left or right). Left and right tilled V-cut has a certain disadvantage: The sawing depth can not be more than 1 - 2mm.

Processing the stones with a bigger depth will result in the laser beam deflection to the left or right side of the stone.

Shapingsoftware.
- A selection of standard forms is available:
- Rounds (circular), Marquise, Pears, Hearts, Ovals, Triangle, Square, Rhomboid (Shield), Custom shape.
- For each shape it is possible to project and adjust the form on the diamond.
- Standard Rhomboid (Shield) shape adjusted to an entirely different form.
- For the sawing of each shape it is possible to specify the V-cut and the sawing parameters.

Useful feature: import shapefile.
With the help of 3D diamond analyzing equipment like „Sarin“ is possible to analyze the stone properties and select the biggest or the best diamond yield from the rough stone. (No direct link.)

The Software allows the importing of DXF files and executes the shaping according to the chosen laser parameters.

In green the projection on the surface of the shape of the rough stone.
In white the oval shape chosen by operator to be cut off.
- Shape creation: import of closed outlines from any vector based graphic drawing package.
- Smart saw: for special work and delicate sawing (Power Modulation).
- Parameter change in pause mode.

Construction:
High stability aluminium frame with adjustable feet.

Dimensions.
- Working height : 800 mm
- Length of construction : 1.200 mm
- Depth: 700 mm
- Weight: approx. 350 kg

Security.
- The construction is made following the DIN security standard.
- Laser Safety class I : closed, safety working area with security doors.

Services.
- Electricity: 240 Volt, Single Pulse, 3,5 kVA, 50-60 Hz (+6%/-10%).
- Stability: < 0,3 %
- Electrical consumption: 2 kW maximum. (Diode pumped laser with integrated cooling.)
- Compressed air: Filtered, dry air flow.

For more Information:
Tel.: +49-911-8000066 ·
Fax: +49-911-8000077 ·
E-Mail: novex@t-online.de
http://www.novex-diam.de
NOVEX Technology Co.
Germany / 90473 Nuernberg, Victor-Huber-Str. 4.