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OpenBuilds OX CNC Machine

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

  1. Nick Lancaster

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    Whats the longest 20x80 you could get as a special order? like 2, 2.5 meters? Because then you could build a very inexpensive 4ft x 8ft router for working sheet goods :D
     
  2. Mark Carew

    Mark Carew OpenBuilds Team
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    Well the longest we make is 1.5m because from what we have found is that the longer the extrusion the more you run into the chance of mis-alignment and deflection issues over the span. We want to ensure we have nice straight accurate extrusions so we stay below 2m. You could however use plates to connect them or even maybe double tee-nuts in the slots for allow profile connection.

    [​IMG] [​IMG]
     
  3. samc99us

    samc99us New
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    Very nice kram! Definitely looks a little beefier than the SO2, still working my custom design but those solid v-wheels are intriguing.
     
  4. Mark Carew

    Mark Carew OpenBuilds Team
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    Thanks @samc99us,
    I had already built the OX before I had all the wheels complete so the video will show a mix of the OpenBuilds V Wheels with the Solid V Wheels but they both work the same way so its all good :)
     
    #34 Mark Carew, Dec 27, 2013
    Last edited: Jan 27, 2015
  5. alex bombay

    alex bombay Advanced Builder
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    I'm building a 1m by 1m Routy-OX hybrid all in black I'm just waiting on some more vslot and bolts.
    IMAG0070.jpg IMAG0073.jpg

    ->By the way the parts list for the routy says 3m bolts so I now have 5 bags of useless bolts :mad:
     
  6. Mark Carew

    Mark Carew OpenBuilds Team
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    That looks great @alex bombay !
     
  7. alex bombay

    alex bombay Advanced Builder
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    Thanks
     
  8. Bryant

    Bryant New
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  9. alex bombay

    alex bombay Advanced Builder
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    5m X 10 mm, also you will need 8, 5m X 40mm for the Z spacers and the X axis

    ->I'm on my 7th order trying to find all the missing or out of stock parts so expect to be short some parts.
     
  10. Mark Carew

    Mark Carew OpenBuilds Team
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    Hey guys part 1 video build-a-long of the OX build is complete! :D (its in the build tab above)
    I am still working on the parts list but will add what I have so far (subject to change as I build) tonight.

    Part 2 video will cover belts/wiring/electronics and software and to be honest it will be a little while before I get it complete it due to work. I will pick away as I have time. I want to be up and cutting too so I will be working at it :)
    Also to note is that this is all an experimental build so there may be changes as we go and you may want to change out things along the way to better suit your needs for a cnc router, for instance the electronics I plan on using to start with are the same as the ROUTY its called the GRBL shield. We may find that this board will not be able to handle the nema 23 at any decent speed so we may go with a higher amp driver.
    Just want to put this out there that I am building the OX this way because I believe this will make a great shop router, its not a kit so if your following along with the build there are no wrong ways to build it.
    I look forward to all the modifications and additions we come up with as a group to make this an awesome tool for everyone to learn from.
     
    Mopar32985 likes this.
  11. bobt

    bobt Well-Known
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    I am also going to build a Routy-OX hybrid in assorted colors. Just to be different. The biggest difference is that I intend to use a fletch beam for the X axis and extra supports on the Y axis. The fletch beam will be made up of 2 80x20x1500 pieces with a 1/8" steel plate down the center with all the pieces bolted together so that the beam will not flex no matter what size of router/extruder/plasma cutter that I hang off of it. I also like the solid wheels. They should decrease any flexing of the unit when built.

    Bob
     
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  12. Robert Hummel

    Robert Hummel Custom Builder
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    That is just awesome man :)
     
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  13. Mark Carew

    Mark Carew OpenBuilds Team
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    @Robert Hummel thanks bro :)

    @bobt
    Wow this is going to be super strong! I had no thought of connecting the two together thats a great idea Bob
    As for the solid Vs they are great but remember they are delrin so with two much weight they will compress. They do straighten right out after a couple rolls but, just something to keep in mind you may have to go with more wheels to distribute the weight.
     
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  14. Sheldon

    Sheldon New
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    I am curious about something, I see the Routy is controlled by 3 drivers. There are 4 motors. Are the y axis motors being shared by 1 driver? and if so, can most stepper drivers operate 2 motors?
     
  15. Mopar32985

    Mopar32985 Well-Known
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    I know with my controller hobby cnc I was told by the owner that each motor needs it's own ports so I'm going to have to use a 4 axis driver because it have 4 motor drivers on it. I hope this helps. I'm not sure about the boards that mark carries
     
  16. Mark Carew

    Mark Carew OpenBuilds Team
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    I am sure having separate drivers will be better, at least for power. I wonder about timing issues though. I am no expert on this subject so I think the best plan here is to test a few different style boards and see which set up we like the best. I really see no problems slaving the axis to the same driver as this will not be a machine built for speed but until we test it its hard to say.
     
  17. Mopar32985

    Mopar32985 Well-Known
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    This is very true and I wounded the same. Well I guess try to slave two together on yours and when I get mine built I can try running them separate. Then we can compare. I'm very curious.
     
  18. Mark Carew

    Mark Carew OpenBuilds Team
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    Sounds good :)
     
  19. Frank G Haymes

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    When do you think that you will have the parts list available?
     
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  20. Mark Carew

    Mark Carew OpenBuilds Team
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    I am sorry about that I really thought I would have something up by last night but you know how it goes. i will get it up there soon, be be warned it is subject to change as we go along the build. I have not completed the build yet so along with that their will be additions as well. So we'll call it a draft at this point :)
     
  21. matt_o_70

    matt_o_70 New
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    Mark,
    I am eagerly awaiting you to share the Sketchup model for the Ox... So that I can order parts.
     
  22. Chris

    Chris New
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    Amazing looking build!
    Quick question for you.

    Will there be limit switch present in this unit? are they even necessary?
    Want to build one as soon as those plates are available to purchase!

    Thanks.
     
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  23. bobt

    bobt Well-Known
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    On the issue of the 3-4 stepper printer controller. You can use a 4 port controller to drive X, 2 Y's and a Z axis system. The only requirement is that the Y's be driven with the same enable, direction and step signals. With 2 drivers tied together the only real problem is getting the motion direction set correctly and this can be done with the wiring to the 2'nd motor as it has to run in the opposite direction from the 1'st motor. To check that the motors are correctly wired up hook them up first and verify the direction that they are turning before connecting the timing belt and if the motors are not rotating in opposite directions then reverse one of the loop pairs on one of the motors to correct this problem.

    Bob
     
    #53 bobt, Dec 30, 2013
    Last edited: Dec 30, 2013
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  24. Mark Carew

    Mark Carew OpenBuilds Team
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    Thanks Matt, we will get'er up there asap. :)

    You could aways put them there(if your control board has that feature) but they are not necessary. I would be nice to have home switches so that you could just send it home if a cut messes up for instance. I may be adding home switches to my build. If I do i will post it.

    This is exactly how I did it on the ROUTY build :)
     
  25. bobt

    bobt Well-Known
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    You need limit switches on all 3 axis for repeatability. They are used to guarantee that the machine know where X = 0, Y = 0 and Z = 0. If you have to change bits or change files or any other interruption in the creation chain of events to make your object then having a precise origin is necessary for that to happen.

    Bob
     
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  26. Anthony Webb

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    Looking to do a build. Curious why you decided to not use the metal wheels? Noise? Wear? Are the plastic wheels solid and without slop? Looking forward to the parts list. I have the shapeoko2 coming, but am already wondering if I would be better off to just start with an OX instead. Thanks for the videos.
     
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  27. bobt

    bobt Well-Known
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    Metal wheels will cause surface erosion on unhardened extrusions (colored extrusions are not hardened). With the different types of builds possible you should be able to create a wheel support design that will work on the existing V-slot design. Mark can respond on how much weight the plastic wheels can support.

    Bob
     
  28. Nick Lancaster

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    I will be installing limit switches on my build. My build is based on OX with many stolen ideas from it. >:)

    My current huge 300+ lbs all wood CNC router has limit switches and they help reset and continue a cut. But unless they are really high quality you will be out a few thousands many times on that. The little mechanical switches are not "super" repeatable. Only to a few thousands usually.
     
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  29. Hugh Clist

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    I'm so glad I came across this site! I was doing research into making your own cnc machine and after a lot of looking at different websites, pictures and links I came across openbuilds. Its an excellent site with a great range of parts in the store.

    I have been watching the OX build on the youtube channel and would love to have a go at making one. I know someone mentioned earlier in the thread about whether you'd be selling the custom plate parts used in the OX, It would be brilliant if those became available to order as I will definatly be getting the parts to make this in the future.

    I am looking forward to the next video explaining how the electronics and software work. I love the mechanical side of things but unfortunaly I haven't got a clue when it comes to electronics. I'm hoping that the community can assist any people like me in this area in the future.

    Keep up the great work you are doing. I will spread the word about openbuilds. It took me a long time to come across the site so I'm wondering how many people are missing out on this.
     
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  30. Mark Carew

    Mark Carew OpenBuilds Team
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    Homing limits are a good thing :)

    We usually say 5 lbs per wheel. This is just from our rudimentary test here in the shop.

    Thank you @Hugh Clist and welcome to OpenBuilds :)
     
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