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Black Box for OX

Discussion in 'General Talk' started by Nick clarke, Dec 4, 2019.

  1. Nick clarke

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    Hi, I have just ordered a black box for my Ox cnc, I have one on my mini mill and am so impressed with it I want to fit one on my Ox so I can run a laser as well as a spindle. Is there a firmware written up for a 500 x 750 Ox? if not how do I go about creating one?
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    We include predefined profiles for all the newer machines, but the Ox is sadly a little old, and a little fragmented (too many versions out there, hard to get "standard" profile.)

    Luckily you can totally still use it!

    OpenBuilds CONTROL -> Connect to BlackBox
    Click Grbl Settings tab
    Load the "CUSTOM" machine profile, don't click save yet (;
    Scroll down and address the important values like steps per mm, etc (github.com/gnea/grbl/wiki explains all that in great details on the Configuration page of the wiki)
    Save it to the Ox.

    Use the Calculators next to the steps-per-mm fields if you need help, or use the Calibration tools under Wizards and Tools to really dial in your distances.

    Then once you are basically moving, use the Grbl Settings tab again to tweak things like limit switches, or faster acceleration and max feedrates, and reverse any axes going the wrong way etc.
     
  3. Nick clarke

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    Hi, many thanks. I guess as a start I could copy in the grbl profile in the Ox build manual as a start, or it has been suggested I use the belt driven Workbee profile and substitute the machine dimensions (ie XY and Z work area size). I have a Duet 2 on the Ox at the moment but I plan on using that on the D Bot I have just started...
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    If your build follows the original absolutely, should be pretty close.
     
  5. Nick clarke

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    Identical!
     
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  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Cool, so that should get close (different belt tensions etc means you'll still need to calibrate), and its not unlikely that you may need to reverse the direction of some axes (older motors had a different color code) but for the most part that should get you started. Of course all those settings are pretty conservative (; so do spend some time tweaking
     
  7. Nick clarke

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    I am just wiring the plugs to the stepper motors, if one of the Y motors needs reversing, can it be done in the firmware or should I reverse the wiring to the plug? How do I reverse in the firmware?
     
  8. sharmstr

    sharmstr Master
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    With OpenBuilds control, go into settings. Change $3. Click "Save to Firmware".
     
  9. Nick clarke

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    Many thanks, what should I change it to?
     
  10. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Easy! You don't need to calculate the value, we made it easy with simple Switches!
    Use the switches to flip the axes you want flipped: Click Save when done!

    dollar3.PNG
     
  11. Nick clarke

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    I have 2 y motors, so one needs to run in the opposite direction. My machine is belt driven...
     
  12. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Flip the wiring on the second motor.
     
  13. Nick clarke

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    Cheers! Many thanks...
     
  14. Nick clarke

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    All done and working thanks! One litle niggle, are 2 limit switches needed on Y axis, one for each motor? The second motor buzzes for about 10 seconds after homing....
     
  15. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Negative, your machine should be assembled square enough that the side without an endstop doesnt hit the end before the side with an endstop does! (as the endstop takes a couple mm's away from the total travel). the Second axis is just slaved, its not controlled independantly
     
  16. Nick clarke

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    The side without the limit switch does not actually hit the end, it sits about 15mm from it once the switch has been triggered, I did check for square and all is good...
     
  17. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Ahh good, thought you meant its vibrating as its running into the side. "The second motor buzzes for about 10 seconds after homing.." - not sure what that means exactly then :)
     
  18. Nick clarke

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    Could it be that the limit switch is on the same side as Y2 motor?
     
  19. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Maybe make a video, I don't quite understand from the description, what it is doing :)
     
  20. Nick clarke

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    Ok, will do...
     
  21. Nick clarke

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    Please note, wiring will be tidied up once all is sorted.
     
  22. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Perfectly fine, if its the brrrrraaaw, click at the end, thats Grbl's Homing Pull-off:

    Grbl Homing Sequence:
    1. Home Z at faster Seek rate gnea/grbl
    2. Contacts switch and retracts out by distance set in Homing Pull Off: gnea/grbl
    3. Comes in slower to get an accurate position (hitting switch slowly to avoid debounce, etc) gnea/grbl
    4. Contacts switch and retracts out by distance set in Homing Pull Off
    5. Home X and Y: Stays after hitting whichever switch it hits until both has been hit the first time
    6. Contacts second switch and retracts both X and Y out by distance set in Homing Pull Off
    7. Comes in slower to get an accurate position (hitting switch slowly to avoid debounce, etc) (slower move might sound a little vibration like)
    8. Retracts out of the switch by Homing Pull-off distance
    9. Sets machine coordinates to appropriate values as homing is complete.

    The Grbl Wiki in its entirety is a must-read!
     
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  23. Nick clarke

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    Oh great! Many thanks. It didn't do that with the Duet, but that uses reprap firmware, not grbl. I am going to fit the laser this afternoon and make something...
     
  24. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Do read gnea/grbl then :)

    (all these links look the same but go to different places!) :)
     
  25. Nick clarke

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    Hoping laser will be hassle free as I am transferring it from my mini mill, which also has a Black Box...
     
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  26. Nick clarke

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    Hi, I seem to have a problem, all was working fine this morning. Just gone to do a job and Black Box will not connect, it goes through the startup routine, connects via usb then says it can't connect. here is a screenshot.... Black Box screenshot.jpg
     
  27. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    The Error 31 disconnect is Windows saying it shut down the port because of EMI
    The access denied after that is just a symptom (reboot will fix that) - as when the port went away, CONTROL lost its handle on it
     
  28. Nick clarke

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  29. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Electromagnetic Interference
     
  30. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Anything changed in between? You mentioned laser being added, sure theres no wiring gremlins thats been added in the meantime ?
     

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