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Screaming Ox CNC Machine

Discussion in 'CNC Mills/Routers' started by Motions, May 6, 2015.

  1. Motions

    Motions Veteran
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  2. Motions

    Motions Veteran
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    Parts list added and drawing updated.
     
  3. jminardi

    jminardi New
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    I would like to build this. Have you worked out the gantry plates yet? I really like this setup awesome work!
     
  4. Motions

    Motions Veteran
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    Thanks a lot. I have seen other people design similar machines but they are so complicated and overkill on part count. I try to design as simplistic and easy as possible.

    Chris was out of the country last week and I haven't heard from him yet this week. I sent him the drawings and waiting to here from him.

    It's hard looking at the design and not building it. I would really like to know how well it works. I may have to bite the bullet and try it myself.
     
  5. Chris Laidlaw

    Chris Laidlaw Journeyman
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    Hi Jm,

    I can do the 4 plates for $200.00 (I take no responsibility for the design working though :).
    It'll take me at least 2 full days of programming, milling, etc.

    The 4 wheel spacer blocks would be $25 (2)
    Z plates $15 (2)
    and my thicker 5-hole joiners $20 (4)

    Total: $260 for 12 parts.

    I am at chrisclub@gmail.com and chrisclub1 on Ebay.

    Chris
     
  6. Motions

    Motions Veteran
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    So little faith in the designer. :(
     
  7. Motions

    Motions Veteran
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    I am redesigning the Z axis to use the C-beam also. This should make the Z more rigid and moves the spindle closer to the gantry. It does require the plates to be modified though.

    This is a design in progress so any suggestions are welcome.

    [​IMG]
     
  8. Sean Yong

    Sean Yong Well-Known
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    Hi Scott, been wondering around thinking to build my first CNC and came across your design, its looking great.

    I will be building one based on your design :)
     
  9. Motions

    Motions Veteran
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    Sweet. Let me know if you need any help. It's a proof of concept right now.
     
  10. GrayUK

    GrayUK Master
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    How about using longer bolts and putting another set of wheels, on either side, against the "Z". :)
    This has always been a weak point! :(
    It would be another great way to strengthen that area!! :thumbsup:


    Even longer bolts and an additional plate on the outside, a little like Ooznest has on the inside of his Y axis to increase stability, then use that to mount the spindle.

    Gray
     
    #10 GrayUK, Jun 15, 2015
    Last edited: Jun 15, 2015
  11. carbuthn

    carbuthn Well-Known
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    Scott,

    I have also been looking at building an Ox using C-Beams. I like your design and may look at purchasing Plates from Chris. But have a few questions if you have a minute or two.
    I was planning on using 2 of the C-Beam plates on the inside of the extrusion (8 wheels total) the plates would be about 8" outside to outside (actually a single plate for each side that was equivalent to 2 plates). Only one of the plates would have an 8mm drive nut to limit friction. With the c facing outwards I think it would minimize some of the debris in the v-slots and allow mounting to the bottom of the C-Beams. I will try to get a drawing put together, just starting to use Sketchup.
    1. Did you go to the outside of the beams out of concern for rigidity?
    2. What size are you building? I was planning x=850mm, y=1000mm and z=250mm this would give a cut area of about 600 x 800mm.
    Thanks for taking the time to share your drawings and I look forward to seeing how your build progresses.

    Chuck
     
  12. Motions

    Motions Veteran
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    Hey Chuck. I'm trying to figure out what you're talking about but I'm having trouble understanding. If you can tell me exactly where you're talking about, I can answer it better.

    I'm not actually building this machine. I only posted it to give people an example of an Ox machine using the C-Beam. I'm still very happy with my Charging Ox machine. My machine is 1000x1000.
     
  13. carbuthn

    carbuthn Well-Known
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    I was trying to understand why you put the wheels for the Y axis on the outside of the C-Beam vs on the Inside of the C-Beam. I tried to learn a little about SketchUp Pro in order to provide a picture of what I am trying to ask. Maybe it will help you understand my question.

    Thanks,
    Chuck
    Chuck C-Beam for OX CNC.jpg
     
  14. Motions

    Motions Veteran
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    Ahhh. I put them on the outside to protect the linear screw from getting debris on it. The wheels on the inside aren't really necessary and may just produce more friction. All the leverage is on the outside wheels.

    You can certainly move the plates to the inside. It will make the machine a little wider but it won't give you anymore cutting area so it's pretty much a waste.
     
  15. ooze76

    ooze76 New
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    Hi Scott
    I am not a competent Sketchup user.
    I would really appreciate it if you could supply some drawings, sketchup, dwg, with dimensions for this particular design
    and costing.

    I was initially going to build a standard OX CNC with 80 x 20 mm v-slot rails for the y-axis, two 60 x 20 mm v-slot rails for the x-axis,
    and a section of 20 x 60 mm for the z-axis. (C-Beam was not available at the time)
    Your design is exactly what I would hope to achieve using c-beam rails instead of v-slot rails. (please find images attached)
    I have doubled up on the y-gantry plate wheels(7 to 14) and acquired a y-brace for each side. This works perfectly with the c-beam.
    (The 250 mm section I am hoping to use for the z-axis is positioned between the wheels)
    I am hoping to use a c-beam rail as the x-axis instead of the two sections of 60 x 20 mm v-slot rails mounted in the position you have laid out in your design.
    I will possibly only place 4 mini v-wheels ( two a side) at the edges of the y-gantry plates.
    Kind Regards
    Hainer
     

    Attached Files:

  16. Motions

    Motions Veteran
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    I only have the design in Sketchup but I have added the dwg for the plates to the project page if that helps. The parts list can be found on the parts list section. It has all costs listed also.
     
  17. ooze76

    ooze76 New
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    Thank you very much really appreciate that.
     
  18. Julius

    Julius Veteran
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    this is great! Slowly planning machine 2: C beam edition for this summer. Thanks for everything :)
     
  19. Barry Danks

    Barry Danks Veteran
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    I too am building a hybrid C Beam :)
     
  20. stargeezer

    stargeezer Veteran
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    This seems to be a common theme right now. Mine is going to use a 5 start 1/2" Acme screw and zero backlash nut in the sides. Sixe will be 1000x 1500mm - I wish I could get the C Extrusion in 2000mm but it's not available yet. (I'm certain it would cost a fortune to add to Open Builds store with very low sale prospects)
     
  21. Julius

    Julius Veteran
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    look into 8020 extrusion. Comes in 1800mm+ segments. I dropped the C idea, and instead will be using 1605 Ballscrews :D
     
  22. stargeezer

    stargeezer Veteran
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    The 1605 ballscrews are super nice, but I have the 1/2" - 5 start on hand in the length I need and the longest 1605 I have here is 1150mm. 350mm too darn short! It's the same reason I'm throwing NEMA34's on it, sure they are overkill, but I have the sitting on my bench. Besides, I've been really bitting at the bit to see these on a bot......
     
  23. Julius

    Julius Veteran
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    looking forward to seeing it. My guy from ebay says he does up to 2000mm ball screws though! Its amazing how much better at customer service they are then some north american companies....
     
  24. ooze76

    ooze76 New
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    Hi Scott
    You drawings were a great help. I have managed to use the original OX y-plates on my y-axis.
    I also designed new C-beam end plates that I am looking to use on two y-axis actuators.
    It allows for a gap between the bottom row of V-wheels on the plates and a 40 x 20 mm V-slot I
    am hoping to bolt down using the bottom six holes and some drop in t-nuts.
     

    Attached Files:

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