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OpenBuilds OX CNC Machine

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

  1. Woodie49

    Woodie49 New
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    Any Photos or drawing on how the diffance axis are driven?
    Thanks
     
  2. Mark Carew

    Mark Carew OpenBuilds Team
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  3. MechEng

    MechEng New
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    Hello all,

    So I'm finally getting around to putting together a few sub-assemblies on the OX, and I noticed on the aluminum plates that the holes the stepper motor shafts pass through aren't wide enough to seat the circular protrusion on the stepper motor, and they also aren't wide enough to pass a GT3 pulley through.

    Just curious if anyone knows what the holes are sized for. A GT2 pulley perhaps? Was kind of bummed out that a nema 23 stepper won't seat in the hole as I thought they would.
     
  4. Robert Hummel

    Robert Hummel Custom Builder
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    They are all like that, Mark uses spacers to seat the steppers, I use a full spacer myself.
    The pulley goes onto the shaft after mounting the motor to the plate.
     
  5. Mark Carew

    Mark Carew OpenBuilds Team
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    Hi @MechEng
    You should see the motors are using 1/8" aluminum spacers as stand offs to keep the stepper 'lip' off of the plate.
    As for the hole not wide enough to put the GT3 pulley though, you add the pulley to the shaft once the motor is mounted to the plate.
    I hope I covered this in the build videos? I will need to go back and check, as its been a little while since I have seen them.
    Hope this helps out
    Mark
     
  6. Mark Carew

    Mark Carew OpenBuilds Team
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    Whoops looks like Robert and I were both typing at the same time :D
    Thanks Robert :thumbsup:
     
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  7. Woodie49

    Woodie49 New
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    Boy, I wish I saw this befor I started my cncrouterparts build!
     
  8. Jay_r

    Jay_r New
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    Hi all,
    Im busy machining the plates this week. Is there a reason the stepper shouldn't be seated to the plate? My second question is, On the model there are 2 mystery holes (to me) one the side plates. One is on the bottom under the OX logo and the second is to the rear of the stepper. Can I omit them, or do they serve a purpose.
    Thanks,
    Jay
     
  9. MechEng

    MechEng New
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    I suppose my question wasn't clear?
    I didn't ask how to attach a stepper motor to the plate. I asked what the hole in the plates was sized for. Any generic nema23 stepper mounting plate geometry is designed for the protrusion on stepper motor to seat into the mounting plate, and the OX plates don't do that, hence my curiosity as to why the OX plates strayed from conventional motor mounting geometry.
     
    Jestah likes this.
  10. Greenman

    Greenman New
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    Hi- I am a distributor and I finally have my web store up and I am adding parts daily. I have 20x80mm x 1500mm I received today please check out my web site www.opensourceluthiersupply.com. Thanks Bill
     
  11. jdcncjunky

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    I'm new to all this CNC, but I've got the bug bad to build one or two or three. Am I wrong in thinking that if the framework of any CNC were build in the standard OX model. could we just build a custom X plate with setups for say, one with router cutter, one with laser cutter, one with pulled knife and one with a extruder for a 3d printer? Couldn't we have just one bed and multiple interchangeable Head units and have all the love and joy of every type of CNC in one system? Call me crazy, but in my minds eye, I can see it. and I like it. What would be the drawbacks to trying something like this? or has it been tried or completed before? If not, I can easily see my garage with 3 or 4 CNC systems and a couple 3D printers
     
    trigger likes this.
  12. Tweakie

    Tweakie OpenBuilds Team
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    Hi @jdcncjunky,

    No reason at all that you cannot have interchangeable heads for the various functions that you suggest. That's exactly what I do, albeit different construction of machine, and the principle works extremely well. ;)

    Tweakie.
     
  13. TahoeTim

    TahoeTim New
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    It can be done but the changeover to a 3d printer isn't as easy as you think. My 3d printer has a heated bed that is elevated by springs. I have to zero it often. Besides I would hate to cut into my heated bed accidentally. You could make an interchangable bed and head system. I am building mine with a smoothieboard that I got on kickstarter. It has 5 drives plus a big circuit to run a heated bed. Since I already have a 3d printer, I can experiment later. I bought a twin filament head to play with. My v rail is being delivered tomorrow so I will be building my ox this weekend.
     
  14. Wojtek

    Wojtek New
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    Is it possible to enlarge this to 1500 by 1500mm and also how hard will it be to make (will it be good as a first build)
     
  15. Mark Carew

    Mark Carew OpenBuilds Team
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    You could always upgrade it to a larger size after you build it an use it for a while. That's one of the nice things about the OX :thumbsup:
    Have fun with your build :)
     
  16. Chris Laidlaw

    Chris Laidlaw Well-Known
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    Has anyone tried Nema 23 motors on their OX CNC? I am wondering if the mounting holes are the same and if the OX can support the 270 oz of the Nema 23 versus the 179 oz of the standard Nema 17. Also, can a Nema 23 be used as the spindle too?
    Thanks.
     
  17. oni305

    oni305 Well-Known
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    I'm so exited, @kram242 tomorrow (or Mondays) i'll pay for the order ( thanks again ;) )
    I'll hope to start soon the assembly of my own OX
    [i'm excited like a little girl when see a pony :D]
     
  18. steelspinner

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    A stepper makes an ok, but inefficient spindle. It has plenty of torque at low speeds but tapers off pretty quickly. About about 400 to 600 rpm (larger motors less) torque goes almost to zero. The motor cogging would also be a problem with surface finish. You can source brushless (BLDC) motors in the same package size (Nema 23/34) for about the same price as a decent stepper. They DO make excellent spindles. They do require a special driver to run.
     
  19. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    There's a kickstarter project right now that is using a brushless DC in a NEMA package. It also notes the need for a special driver board to run.

    [​IMG]
     
  20. steelspinner

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    I was thinking about using a set up similar to that on the build I am (VERY SLOWLY o_O) working on.

    Most of the BLDC motors that are not RC motors have Hall effect sensors in them and need a three phase driver. The drivers are a three phase driver that put out a sinusoidal wave form and use the sensors to "time" the wave forms for the three phases. They are crazy efficient and capable of very high speed with an almost flat torque curve.:thumbsup:
     
  21. Chris Laidlaw

    Chris Laidlaw Well-Known
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    Many thanks for the advice folks!
     
  22. Richard

    Richard New
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    The RC/BLDC idea sounds brilliant, but I havent been able to find the mounting kit anywhere on the site. Is there a link?

    2 other quick questions, when are you getting some more v-slot rail in stock and can I pre-order some?
    last question! Is there anyone apart from robocutters.uk selling the Ox gantry plates?
     
  23. Greenman

    Greenman New
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    Hi Richard- I am a new distributor for Open build and I have a limited supply of V rail in stock. I am in New York State and I charge the same prices as the Open build store. Check out my website at www.opensourceluthiersupply.com Regards Bill Sterling
     
  24. dddman

    dddman Journeyman
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    @kram242
    How did you manage to get 5mm wide belt? I can't find them anywhere on Google!
     
  25. MJT

    MJT New
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    All,

    I have ordered all the parts available for the OX but Nema motors and the boards are out of stock.

    Since the parts are back ordered, I thought to do some R&D.

    If I use MK3 from Planet_CNC , can I use Nema Motors with integrated driver?

    Something like this?
    http://www.anaheimautomation.com/pr...ntegrated-item.php?sID=49&pt=i&tID=132&cID=50

    Are these motors compatible with MK3?

    or should I use a driver board like this?
    http://www.planet-cnc.com/index.php?page=shop&shop=motors

    CBC bug has bit so looking forward to all the fun and frustration of learning. :)
     
  26. oni305

    oni305 Well-Known
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    Hi @kram242 I've paid for the order (commercial invoice 0430), thanks again :D
     
  27. Richard

    Richard New
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    Hi

    I am no expert as I am new to this but I do have a background in electronics and I have done a fair bit of research so here goes!

    My understanding is that the motors work allot more efficiently at voltages higher than 24V which is the limit for the motors with the integrated drivers you are looking at - I am using 48V for my build. I would always recommend against integrated devices because if one part fails, the whole lot is garbage. So if something fails in the driver both it and the motor need to be replaced. if you want to go that route try these http://www.leadshine.com/producttyp...ucts&producttype=integrated-easy-servo-motors but you may have mounting issues as they are more bulky.
    As far as the driver you mention, for a bit more you can buy the excellent LeadShine drivers or one of the many clones of them. The M542 would be fine for you
    http://www.leadshine.com/series.asp...-products&producttype=stepper-drives&series=M

    If your budget will stretch to them, the digital drivers are great, very quiet and no harmonics. I got mine from these guys - really good service as well as good prices. They do normal as well as the digital drivers and their motors are really good as well.

    http://stores.ebay.com/primopal-motor?_trksid=p2047675.l2563

    Hope this helps
     
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  28. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    What kind of controller are you looking at for these?
     
  29. MJT

    MJT New
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  30. asb_79

    asb_79 Well-Known
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    I can supply 6mm Aluminium Waterjet cut Gantry plates, I also made the triangular frame connectors. They are $85/set plus postage.

    They aren't as well finished as the Milled parts but are fully functional. The surface is Mill finish and no finishing has been done to the watercut edges. The holes in the plates have been drilled to size.

    BTW, I'm located in Australia
     
    Nigel King and pan713 like this.

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