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OpenBuilds OX CNC Machine

Discussion in 'CNC Mills/Routers' started by Mark Carew, Dec 15, 2013.

  1. Robert Hummel

    Robert Hummel Custom Builder
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    Lol

    Yep I will keep you in the loop ;)

    The motors are from dddman, here is his site http://www.fuzztech.ca
    I have cleaned them up, blasted them with the chrome bomb and wired them to some flexible shielded 4 conductor wire
    image.jpg

    What I like about the new drivers I sourced are the screw terminals are better quality, high voltage in and motors out are on one side of the board and low voltage, step dir are on the other.
    They will come ready to wire/mount with stand offs and heatsink
    They will be used in my production mill along with the MK2 board
     
  2. Paruk

    Paruk Journeyman
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    Can't wait to see where you coming up with!

    Also, tonight at around 20:30H local time my Buffalo has come to life. It moves and makes little stepper sounds, very quiet but distinctive. :)
     
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  3. GrayUK

    GrayUK Openbuilds Team Elder
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    Ah. Bless. It`s first steps. :thumbsup:
    Gray
     
  4. RichSimon

    RichSimon New
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    Well, I finished my build, and it's great. Besides having to learn about positioning, zeroing, and all that jazz, I have run into one hardware issue I hope someone can provide input on.

    I've got the DeWalt 611 in there nice and solid. But once I turn the router on, the leadscrew on the z-axis starts turning, slowly but constantly, from the vibration of the motor and drops down. Has anyone seen this before? I'm hoping there's an easier solution than disassembling the axis and tightening the eccentrics, which I could tackle tomorrow I suppose.

    The z-axis wheels are pretty tight, and the motion is unexpected. The wheels can hardly move if you push them manually. The gantry does, however, move down when you push the whole thing by hand.
     
  5. Robert Hummel

    Robert Hummel Custom Builder
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    You should have the motors enabled before firing the spindle.
    If it moves with the motor enabled then the motor is not strong enough to handle the vibration
     
  6. Frederic Goddeeris

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    I have the same issue, and I think Mark mentioned before as well.
    What I do for now is hit the start button and while the machine is raising the router to go to its first point I start the router. As soon as the script is running all motors are under power, at least that seems the behavior of GRBL.
    I plan to have GRBL switch the router on for me via a relay and I hope this will automate this process.

    Frederic
     
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  7. Paruk

    Paruk Journeyman
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    Today cleaned up and covered the cabling and installed the cable chain on the X. Except for some really minor tweaks I consider my build to be completed. Now it's time to start tuning the software and make the system ready for its first cut. Let's see if that can happen tomorrow.
     
  8. Paruk

    Paruk Journeyman
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    @Robert Hummel; what resistance should I measure on the TB6600 for 2.8A? Thanks in advance.
     
  9. Paruk

    Paruk Journeyman
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    Are the following settings correct for the stepper motors: Nema 23 1.8 degrees, 1/8 micro stepping, GT3 belt 3mm pitch, pulley 20 tooth is 26.666667 steps per mm?
    And.. for the Z - Nema 23 1.8 degrees, 1/8 micro stepping, 8mm ACME lead screw with 2mm pitch, direct drive should be 800 steps per mm?
     
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  10. Mark Carew

    Mark Carew OpenBuilds Team
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    Take a look at Zapmakers reply on his Grbl Controller blog:

    Lots more helpful videos here: http://zapmaker.org/projects/grbl-controller-3-0/
    Hope this helps
    Mark
     
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  11. Hokkaju

    Hokkaju New
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    Hi I was looking long time some vids about how OX can cut aluminium. Well After short pause due too many issues to do I was able to do my own cutting video. I´m quite happy about way cutting works. My material is really very unsuitable for milling, didnt really know should I vacuum it of use cutting fluid, so surface is bit "technical" level. But this step was bigger for me than for mankind.
    1st alu cutting trial.JPG
    v=400mm/min, rpm ~25000, diameter 3.175mm 1-cut, z 0.7mm.

    And I managed to make couple very usable household items, cheers and happy weekend :brb:
     

    Attached Files:

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  12. Robert Hummel

    Robert Hummel Custom Builder
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    I have not got that far with them
    I just set them with the pot at 50% and a bit
    I will fine tune everything after the controller is assembled.
    Waiting on my 24v power supply still :(

    I assembled the X access of the Fiber OX, things run real smooth with the new metric spacers :thumbsup:
    image.jpg

    I'm going to wire the other motors while I mill some plate sets ;)
     
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  13. Robert Hummel

    Robert Hummel Custom Builder
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    We'll done!

    Vac the chips and lube in little amounts just to keep the bit cool.
    Best bet lube, let 2 passes go then vac/repeat ;)
     
  14. Hokkaju

    Hokkaju New
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    Thanks, I´ll keep in mind. Still so much to learn.....
     
  15. Robert Hummel

    Robert Hummel Custom Builder
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    Are you using the tinyG board?
    If so there is a fix that will enable all motors on power up.
    From what I understand by default it is set to enable when the g-code starts
     
  16. Hokkaju

    Hokkaju New
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    $1=255 should disable grbl releasing motors... Not sure if your board will use grbl...

    $1 - Step idle delay, msec
    Every time your steppers complete a motion and come to a stop, Grbl will delay disabling the steppers by this value. OR, you can always keep your axes enabled by setting this value to the maximum 255 milliseconds. Again, just to repeat, you can keep all axes always enabled by setting $1=255.
     
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  17. GrayUK

    GrayUK Openbuilds Team Elder
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    Am I mistaken, or is that shaft, with the dual wheels at the front there, bending the fibre gantry plate inwards, towards the aluminium? o_O

    Maybe it's just an illusion with camera. :confused:

    Looks really good though. :thumbsup:
    Gray
     
  18. Robert Hummel

    Robert Hummel Custom Builder
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    Cam angle and lighting ;)
    The shine of the finish is nice but not perfect
     
  19. Frederic Goddeeris

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    @Robert : it is grbl...

    @Hokkaju and @Mark : indeed $1=255 for GRBL 0.9 works fine, as soon as the board is powered the motors are active. ($7=255 is for 0.8)

    Thanks,
    Frederic
     
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  20. Robert Hummel

    Robert Hummel Custom Builder
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    I don't take the risk and rather a flat flush mounting surface for just the reasons you posted.
    It just makes for a more solid machine ;)
     
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  21. Robert Hummel

    Robert Hummel Custom Builder
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    What I got done while milling today :D

    image.jpg
    All motor wires have been ran / cleaned
    Drag chain installed and it's on to the Y axis I go ;)
    The rest of my parts should be here soon.
    Must say the assembly is very stiff / strong and the weight difference is amazing :thumbsup:
     
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  22. SlyClockWerkz

    SlyClockWerkz Well-Known
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    I'm pretty happy with my garolite fiber plates on my ox, they seem to be very capable. Robert, I'd like to see your production machine more up close. Some of your youtube videos doesn't showcase it super well ;)
    I'd like to see Chris's setup too :D
     
  23. Robert Hummel

    Robert Hummel Custom Builder
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    The mill I use to produce all of my parts at the moment was built from the ground up.
    It started out as an RC spindle setup that I then used to upgrade itself.
    The entire mill was built with hand tools and the controls where also built from scratch because I got a 4 axis Chinese board that the Z axis diver ic burnt.
    I dissected the board and built standalone drivers with the remaining good chips.
    Here are some pics I have of the upgrading process :)

    image.jpg
    image.jpg
    image.jpg
    image.jpg
    image.jpg
    image.jpg
    image.jpg
    image.jpg
    image.jpg
     
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  24. Hokkaju

    Hokkaju New
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    Does anyone know if there is possibility to replace laptop with some memory card reader and UI panel.
    I mean it would be really awesome to have possibility to run my machine stand-alone.
     
  25. Frederic Goddeeris

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    Open-source code like grbl could be adapted. Alternatively this could be very nice little arduino project for a standalone device. This has the advantage of not having to touch existing well-tested code. Would be cool to also add a buttons for manual axis control. Or perhaps a little touch-screen :)
    Hmm, if only I did not have so many pots on the fire :rolleyes:

    Fred
     
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  26. plexer

    plexer New
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    You could look at a controller such as the RAMPS or RAMBO they have sc card readers and lcd display available, you then stick in the sd card with your gcode and select it from the LCD.

    You don't have to use the little plug in drivers either you can break out the connections to whatever sized driver you want.

    Ben
     
  27. planga

    planga New
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    Hi! Can you tell us what type of Garolite you used for your machine and where you purchased it. Also what did you use to cut it?

    Thanks!
    -Patrick
     
  28. Paruk

    Paruk Journeyman
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    @ Mark, have this odd thing going on with Sketchucam, see screenshot of the gcode in CNC USB Controller. On the right upper corner you will see that the mill descents slowly at every pass, instead of plunging in and start milling. Had a tricky surprise this morning with milling because of it. Any idea what causes this code?
    Screen Shot 2014-10-07 at 17.07.25.png
     
  29. David the swarfer

    David the swarfer OpenBuilds Team
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    please send me the sketchup file and your gcode file so I can figure out what is going on.
     
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  30. Paruk

    Paruk Journeyman
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    @ David, opened a conversation with the files attached.
     

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