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Laser, 2 wire, 2.5 watt

Discussion in 'Controller Boards' started by base1379, Nov 29, 2020.

  1. base1379

    base1379 New
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    Hello,
    How do I go about wiring up this (12 volt, 2 wire) laser to the blackbox? In the documentation I only see 3 and 4 wire options
    Thanks,
    wolfgang
     
    #1 base1379, Nov 29, 2020
    Last edited: Nov 29, 2020
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Might be helpful to include a little more details of the laser (;
    Pictures, product links, manual, etc
     
  3. base1379

    base1379 New
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  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    From the product description "Just plug in power adapter, then the laser emits immediately" tells us this does not have a control signal input
    IE this module does not support PWM input - typically this is used more for light shows.

    Replace it with a Module that has control signal inputs. It's pretty useless for engraving applications

    Alternatively, you'll have to put your own control circuitry in between the power supply, and the laser module (mosfet circuit) to input the control signals into, or replace the Diode Driver with one that does. Note that you should NOT PWM the input power to a laser diode driver, as the initial power surges will kill the diode in a matter of hours.
     
  5. base1379

    base1379 New
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    I cannot comment on its abilities at engraving or light shows. I've tested it cutting nylon fabric and webbing successfully, which is my intended purpose.
    I don't need to PWM it, so I'll proceed with a relay. Which signal from blackbox makes the most sense to do this? I removed the "Relay mode jumper" already because I have a servo.
    Thanks,
    Wolfgang
     
  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Disable PWM (Variable Spindle) by recompiling Grbl, then use the former PWM pin
     
  7. base1379

    base1379 New
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    I have both a servo and the laser, those are my only 2 tools. I'm currently using the 2 axes plus RC servo firmware.

    I have both working now... kind of. I put the jumper on RELAY FUNC M8/M9, and wired the laser into the relay. I generated the laser toolpath as a pen, then replaced the pen up/down M3 commands with M8/M9 in the g code.
    In GCODE GENERATOR. is there a custom tool that i can define the on/off commands, and set them to M8/M9, so that I don't have to find and replace them in the g code later?
    I'm sure there's a better way to do this than the spontaneous hack i've come up with.

    Thanks!
    wolfgang
     
  8. base1379

    base1379 New
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    Here's a test of the machine with the modified g code
     
    Giarc likes this.
  9. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    As you have a servo too, i guess hacking the coolant signal is the alternative. Find and replace will have to be the way then. Most CAMs will stick to the standards (M3, 4,5 for tool, M7, 8,9 for coolants)
     

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