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Screaming Ox CNC Machine

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

Screaming Ox CNC Machine

Screaming Ox CNC Machine

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

Big brother of the Charging Ox CNC machine.

ox cnc charging screaming tinyg
  1. Motions

    Motions Well-Known
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    #1 Motions, May 6, 2015
  2. Motions

    Motions Well-Known
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    Parts list added and drawing updated.
     
    #2 Motions, May 7, 2015
  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!
     
    #3 jminardi, May 18, 2015
  4. Motions

    Motions Well-Known
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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.
     
    #4 Motions, May 19, 2015
  5. Chris Laidlaw

    Chris Laidlaw Well-Known
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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 [email protected] and chrisclub1 on Ebay.

    Chris
     
    #5 Chris Laidlaw, May 20, 2015
  6. Motions

    Motions Well-Known
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    So little faith in the designer. :(
     
    #6 Motions, May 20, 2015
  7. Motions

    Motions Well-Known
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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]
     
    #7 Motions, May 23, 2015
  8. Sean Yong

    Sean Yong New
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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 :)
     
    #8 Sean Yong, Jun 15, 2015
  9. Motions

    Motions Well-Known
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    Sweet. Let me know if you need any help. It's a proof of concept right now.
     
    #9 Motions, Jun 15, 2015
  10. GrayUK

    GrayUK Openbuilds Team Elder
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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 New
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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
     
    #11 carbuthn, Jun 21, 2015
  12. Motions

    Motions Well-Known
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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.
     
    #12 Motions, Jun 21, 2015
  13. carbuthn

    carbuthn New
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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
     
    #13 carbuthn, Jun 21, 2015
  14. Motions

    Motions Well-Known
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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.
     
    #14 Motions, Jun 22, 2015
  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:

    #15 ooze76, May 12, 2016
  16. Motions

    Motions Well-Known
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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.
     
    #16 Motions, May 13, 2016
  17. ooze76

    ooze76 New
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    Thank you very much really appreciate that.
     
    #17 ooze76, May 13, 2016
  18. Julius

    Julius Well-Known
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    this is great! Slowly planning machine 2: C beam edition for this summer. Thanks for everything :)
     
    #18 Julius, May 13, 2016
  19. Barry Danks

    Barry Danks Well-Known
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    I too am building a hybrid C Beam :)
     
    #19 Barry Danks, May 13, 2016
  20. stargeezer

    stargeezer Journeyman
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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)
     
    #20 stargeezer, May 14, 2016
  21. Julius

    Julius Well-Known
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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
     
    #21 Julius, May 15, 2016
  22. stargeezer

    stargeezer Journeyman
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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......
     
    #22 stargeezer, May 16, 2016
  23. Julius

    Julius Well-Known
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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....
     
    #23 Julius, May 16, 2016
  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:

    #24 ooze76, Jun 5, 2016

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