22. PLH3D-2W ENGRAVING LASER HEAD
This sub-assembly is a medium power engraving laser head with thermal protection and professional high speed driver. Its design ensures that the head doesn’t require any additional cooling. Fan design makes it work as a fully customized air nozzle protecting lens from dirt and cooling the laser head.
PLHD 3D 2W driver ensures proper work of the laser head and protects laser diode from overheating. During normal work green diode is turned on. When the laser head reaches 40 degrees Celsius second LED diode starts to glow. At 45 degrees the laser head switches off.
Turning collimating lens allows to change the beam focus distance. Air flow from the fan keeps lens clean during operation.
You can use two types of lens with our PLH3D laser heads. G2 lenses are popular because of the efficiency but it is not the most important parameter. While engraving, power density is more important - unfortunately G2 lenses are not providing small beam spot (while focused). Three element lens which are making bigger optical power loss allows to obtain smaller beam spot which helps to obtain bigger power density. The choice is up to customer's requirements, since in some situation it is better to use G2 lens and sometimes three element lens.
The laser head allows to cut or engrave materials such as rubber, wood, paper, leather, plastic, cardstock and many other. Thanks to full analog modulation it is possible to engrave in shades of grey or change the output power during turns. The same effect can be achieved by using PWM signal which is fully compatible with PLH3D driver. High speed modulation (up to 100 kHz) allows to use high movement speed during engraving even complicated patterns.
Module is using brand new NDB7875 450nm diode which is one of the strongest available on market blue laser diode. Recommended power supply unit is 12V with current capacity at least 2A. On our website there are available DC-DC converters which allows to easily change any higher voltage into 12V.
Lifetime of laser diode given by manufacturer is 10000h.
It is also possible to buy a version with additional aluminum holder which allows to mount the engraving laser head on the moving part of the machine.
Main advantages of the PLH3D 2W:
- Easy connection to all 3D printers and CNC machines producers.
- Dedicated software - G-code generator
- No need for additional cooling.
- Simple installation to all 3D printers and CNC routers
- Driver attached to the laser head.
|Dimensions of laser head (LxWxH mm)||30 x 30 x 68,5|
|Modulation voltage range (V)||0 - 5|
|Modulation type||TTL or analog|
|Input voltage (V)||12|
|Mounting holes distance (mm)||20|
|Focus distance (mm)||20 - 120|
|Diode power (W)||2.8|
|Maximum power consumption (W)||15|
|Example beam spot size at 80mm distance||0,1 x 0,18 mm|
|Internal part no||001633|
Connection of the laser head
Connecting engraving laser head is very simple and is using 4-pin connector. To each device 4-pin connector is included.
Remember to use both of GND cables
Pins #3 and #4 should be connected to proper power supply unit which also can be buy at our website or together with laser head. Pin #2 should be connected with GND of the modulation signal source while pin #1 to the source of 0 - 5 V signal which is responsible for power modulation.
1 – Analog in 0-5V
2 – Analog GND
3 – GND
4 – Vcc 12V (minimal current provided: 2,5A)
Additional single lens collimator is attached. Premounted three element lens collimator is 30% less efficient but it has 2 times smaller spot. You can check which one works the best for you.
Setting the focal length/distance
Setting the focus distance should be firstly done by turning the lens and then, after making the lens not move, by using your Z axis in CNC machine. Focus depends on type of lens used and their distance from laser diode. Remember, do not change the position of the lens while laser is operating. Switch the laser each 0,5 turn of the lens in order to check beam spot position.
Be careful not to unscrew the lens accidentally – the lens can fall down and get dirty/destroyed. For three element lens focus length should be in range between 120 and 40mm. For single element lens it should be in range between 100 and 20mm. Nevertheless accurate focus distance should be set according to the test made with your material.
- Remember that it is not a toy. Laser radiation is dangerous even when scattered or reflected from any surface.
- Always use proper protection laser filter on your CNC machine dedicated to 430 - 480nm in order to avoid reflected radiation.
- Never point laser head at people or animals.
- Do not touch the beam, it may cause burns.
- Do not stare at the beam or the beam spot while the material is being cut.
Recommendations and requirements
Modulation input can be used as TTL/PWM input with its logic levels of 0V and 5V or as an analog input. Analog modulation means that by using 2,5 V on ANG input you get 50% output power, analogically by using 4 V you obtain 80% output power, etc.
Cleaning the optics is important since dirty optics reflect some % of power back to the diode what may be damage it irreparably.
Air flow is very important during the engraving process since it is blowing out dark smoke which can cause optical obstacle for a laser beam.
This module has thermal protection system which protect laser diode from overheating.
The analog input is protected by a 5V1 Zener diode on occasion there appears the voltage higher than 5V. Despite everything, this input should not be used with higher voltages.
The output of the driver is protected by Shottky diode which doesn't allow the reverse voltage to appear.
Dimensions of the PLH3D – 2W
Dimensions of the aluminum mount
PLH3D 2W with aluminium holder
Additional components (depending on set, different parts are included )
PLH3D-2W with ABS nozzle
Parameters of cutting
Note, that this speeds and parameters are effects of tests and can be different for some materials, cooling systems as well setting of the focus distance.
Binder board 3mm: 5mm/s; 2W; 8x0,5 passes
Balsa 5mm: 25mm/s; 2W; 5 passes
5-layer cardboard 5 mm: 10mm/s; 2W; 4x1,25
Rubber 0,5mm: 15mm/s; 2W; 3x0,25
Jeans 0,5mm: 8mm/s; 2W; 1pass
T-shirt 0,5mm: 25mm/s 2W 1 pass.
Glass fiber reinforced foil (dark) 0,3mm: 3mm/s, 1 pass.
Laser has no effects on: