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OpenBuilds ACRO Laser System

Discussion in 'Laser Cutters' started by Mark Carew, Sep 12, 2017.

OpenBuilds ACRO System

OpenBuilds ACRO System

Discussion in 'Laser Cutters' started by Mark Carew, Sep 12, 2017.

The OpenBuilds ACRO System was developed to be the most accurate and cost effective positioning system in its class. The ACRO System incorporates the OpenBuilds V-Slot system and, therefore, has the unique ability to expand to multiple sizes creating a size configuration custom to your needs. Choose the size that best fits your workshop. This versatile system allows for precise positioning of many different mountable tools and attachments.

Pen dremel chocolate laser doide cnc engraver laserweb projectmakr OpenBuilds draw pip
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  1. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Position is fine, same pin is used for pwm and without. If that module doesnt handle PWM just make sure to always generate GCODE with 100% power (where S??? = same value as $30=???
     
    #511 Peter Van Der Walt, Jul 3, 2020
  2. Enrique Salcido

    Enrique Salcido New
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    Thanks for replying.

    Allright $30=1000 rpm and LASER ON 100% is M3 S1000 , so even though I cannot make the laser test with the Tool On option, If I launch the GCODE with 100% the laser should start working?
     
    #512 Enrique Salcido, Jul 3, 2020
  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    You should be able to. Forgot to set Laser Mode ($32=1) to Enabled?
     
    #513 Peter Van Der Walt, Jul 3, 2020
  4. Enrique Salcido

    Enrique Salcido New
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    I just add the new parameters, and still not working , any other suggestion Peter?

    thanks for your time
     
    #514 Enrique Salcido, Jul 3, 2020
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Do you have a GND to the laser module?
     
    #515 Peter Van Der Walt, Jul 3, 2020
  6. Enrique Salcido

    Enrique Salcido New
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    image0.jpeg
    Yes! There it is
     
    #516 Enrique Salcido, Jul 4, 2020
  7. Ronald van Arkel

    Ronald van Arkel Veteran
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    There are 2 power sources. One comes from the MeanWell 24v that goes to the BlackBox, the other is another AC/DC converter that delivers the 12v to the laser driver. I'm unfamiliar with the internals of the laser driver and the BlackBox, but it might indeed be the GND problem. I would check if there is a difference in voltage between the 2 power supply GNDs (should be 0v).
     
    #517 Ronald van Arkel, Jul 7, 2020
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  8. Enrique Salcido

    Enrique Salcido New
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    exactly! Does someone knows what should I do? The guy who sold me the laser, suggested me to use a pmw/ttl converter.
     
    #518 Enrique Salcido, Jul 7, 2020
  9. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Won't be needed.

    Just wire it as GND (black wire on TTL input) to GND on Toolhead connector, and TTL+ (Red wire) to PWM on BlackBox

    Then only use 100% laser power to generate "TTL" (no PWM). Lower percentages becomes PWM to lower the power level, those chinese modules often work on PWM anyway they just label it TTL due to language barrier

    Set $32=1, $30=1000 and then use OpenBuilds CONTROL > Tool on > Laser to test
     
    #519 Peter Van Der Walt, Jul 8, 2020
  10. Enrique Salcido

    Enrique Salcido New
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    Allright, I´m cheking with a voltimeter the pwm output connection and I get 0.8V , how can I calibrate the output from the black box to get the full Volts needed?
     
    #520 Enrique Salcido, Jul 14, 2020
  11. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    No calibration. Just send the correct commands. Note laser mode only sends output during a move. Read the Grbl wiki
     
    #521 Peter Van Der Walt, Jul 15, 2020
  12. internut

    internut New
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    Hi Guys, I'm building the ACRO 510 and are busy sourcing the parts. The parts list states that I must get 3 x GT2-2M Timing Pulley - 14 Tooth, but where I stay I could only manage to source 16 Tooth GT2-2M Timing Pulleys. Would that make a difference or MUST I get the 14 tooth pulleys. What difference is it gonna make to my built and/or can I compensate for that 2 tooth difference somehow? Thanks in advance.
     
    #522 internut, Jul 29, 2020
  13. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    1) Slight decrease in accuracy (but increase in top speed)
    2) Different steps-per-mm value in the configuration (remember to update the settings or you're jobs will come out sized incorrectly): refer gnea/grbl
     
    #523 Peter Van Der Walt, Jul 29, 2020
  14. internut

    internut New
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    Hi Peter, thanks for the reply. I'm also into 3D printing and I'm familiar with calibrating e-steps if thats what you mean in #2. BTW I'm from Secunda.
     
    #524 internut, Jul 29, 2020
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  15. David the swarfer

    David the swarfer OpenBuilds Team
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    you can use this calculator to figure out your initial steps/mm value, then calibrate from there
    GRBL settings calculator
    (on a server in J'burg while I am in Grahamstown)

    ps: stumbled on this place yesterday
    Gadgitech Trading
    seems expensive <-:
    Aluminium T-Slot Extrusions has V-slot extrusions etc.
     
    #525 David the swarfer, Jul 30, 2020
  16. internut

    internut New
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    #526 internut, Jul 30, 2020
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  17. internut

    internut New
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    Hi guys, just wanted to show my Acro build progress. IMG_20200820_190656.jpg IMG_20200820_185937.jpg
     
    #527 internut, Aug 22, 2020
  18. internut

    internut New
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    I now have a question for the guru's. I have two boards, Arduino Uno with CNC Shield and MKS Gen L v1.0. Which one would you recommend for my Acro 510 and should I use Marlin or Grbl?
     
    #528 internut, Aug 22, 2020
  19. David the swarfer

    David the swarfer OpenBuilds Team
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    Uno with GRBL
    Marlin is designed for 3D printing and it does that very well, others things not so much
     
    #529 David the swarfer, Aug 22, 2020
  20. internut

    internut New
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    Okay thanks. Can I connect the two y-axis stepper motors on one driver with the cnc shield? Then I have don't have to use two drivers. On my Flsun cube 3d printer with the MKS Gen L v1.0 board I have both my z-axis stepper motors on one driver with a y cable.
     
    #530 internut, Aug 22, 2020
  21. Giarc

    Giarc OpenBuilds Team
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    Depends on the driver and the amperage of the stepper motors. You can always try and see what happens. Personally I would use separate drivers for all 4. Also, if that CNC shield is a Chinese clone, the pinouts have changed since grbl 0.8 (when those clones were cloned) which will affect which pin you use for the laser. gnea/grbl
     
    #531 Giarc, Aug 22, 2020
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  22. internut

    internut New
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    You were right, thanks. I'm running one driver on one stepper now. The amps of the two steppers are more than that of one driver.
     
    #532 internut, Aug 29, 2020
  23. internut

    internut New
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    Morning guys. I have two questions.
    1. On my Acro 510 with cnc shield with A4988 drivers, should I go full, half, quarter, eight or sixteen micro stepping?
    2. On my Arduino Uno with CNC Shield v3.00 I can only install up to GRBL 0.9j firmware for everything to work. When I install GRBL 1.1 nothing works?
     
    #533 internut, Aug 29, 2020
  24. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Original shields from Protoneer Arduino CNC Shield – 100% GRBL Compatable works with Grbl 1.1. The chinese fakes are still Grbl 0.8 pinout. Supporting the original creators (for about the same price as fakes after all) not only supports continued development, but also entitles you to support
    Grbl 1.1 came out in 2016, grbl 0.9 already had the revised pinout (ie even older) , so sad they keep catching people by selling an outdated board. Protoneer has a nice writeup about it at the link above. But yeah, support the real developers, help make the world a better place

    To use those with Grbl 1.1 refer to the Grbl wiki to see which pins moved where and adapt how you wire it, or recompile the firmware (what you save in cost going with the fake ones, sadly will cost you in time and learning curve).

    Alternatively, even better, get a Blackbox (start [OpenBuilds Documentation] for more) which is the official controller for use with OpenBuilds machines / software / support
     
    #534 Peter Van Der Walt, Aug 29, 2020
    Last edited: Aug 29, 2020
  25. internut

    internut New
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    Thanks, to go for another control board is not an option due to the money problem. I will go with the learning curve and try to recompile. Can you perhaps give me a answer on question one?
     
    #535 internut, Aug 29, 2020
  26. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    A4988s are extremely weak (500mA practically out of the undersized pololu footprint that limits thermal performance) so you'll have to go low on the microstepping to get any torque out. Higher microstepping = lower torque. You will still have to keep accelerations low so won't work too well for raster jobs.
     
    #536 Peter Van Der Walt, Aug 29, 2020
    Last edited: Aug 29, 2020
  27. internut

    internut New
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    I'm not experienced with this kind of projects you must understand. Should I go full, half, quarter, eight or sixteen with the jumper settings like I asked in my first question please!
     
    #537 internut, Aug 29, 2020
    Last edited: Aug 29, 2020
  28. JustinTime

    JustinTime Veteran
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    Try eighth and if you see you have problems with the stepper not being able to keep up go to quarter.
     
    #538 JustinTime, Aug 29, 2020
  29. tazma

    tazma New
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    hello I need help because I don't know what happens with grbl 1.1
    I can't configure
    I have assembled acros laser arduino, cncshield, nema17, a4988 driver
    as seen in video and photo
    $ 100 and 101 = 26.666667 I draw a 50 x 50 mm square but the laser makes a 26 x 26 cm square if you look at it is what marks $ 100 and 101
    I try $ 100 and 101 = 20,000 and the laser makes a 20 x 20 cm square and if successively if I decrease $ 100 and 101
    I do not understand anything

    https://fotos.subefotos.com/e57fad1dfafb55e9df75c4e4999b6040o.jpg
    https://fotos.subefotos.com/6ec0c1f495a19663bd70734b4a67a74ao.jpg
    https://fotos.subefotos.com/e46fcc862c32a7c2466224ce3fb67fdfo.jpg
    https://fotos.subefotos.com/ec97f18ec67e74a4baf1a93ffe2cc69ao.jpg
    https://fotos.subefotos.com/37238bac4e4488e9673c1d6ed75eeba9o.jpg
    https://youtu.be/nvCZZtGNq1Y
     
    #539 tazma, Sep 4, 2020
    Last edited: Sep 4, 2020
  30. internut

    internut New
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    Thanks for the motivation. I've managed to get the latest grbl_v1.1h.20190825.hex by uploading it with xLoader and now everything is working as it should or lets rather say how I want it to work. GRBL is actually nice, I like it. I will post my final pics of my build when I'm finish with my cable management. Thank You.
     
    #540 internut, Sep 4, 2020
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