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OpenBuilds OX CNC Machine

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

  1. Tweakie

    Tweakie OpenBuilds Team
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    Hi Martin,

    You should be using a separate stepper driver for each motor then the two axes (Y & A ?) are slaved together. Connecting two motors to one driver is really not a recommended practice.

    Tweakie.
     
  2. Lee Saferite

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    Is it normal to refer to the siteside to side gantry as the X axis?

    I always thought front to back was X, side to side was Y, and up/down was Z
     
    #1022 Lee Saferite, Jul 12, 2014
    Last edited: Jul 13, 2014
  3. Lee Saferite

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    Mine is finally alive and kicking. I'm still finalizing all the working wiring and the electronics box, but it was moving today.

    IMG_20140712_202833.jpg

    I'm being super picky about the wiring. I bought the correct color wires to match the stepper, 2x2 molex connector parts, braided cable sheath, cable chain. The whole nine yards.
    IMG_20140712_223738:nopm:.jpg

    I also built a BLDC spindle based on the parts from Robert and it rocks. Once I get the PWM signal from the TinyG worked out to control the spindle I'll be happy.
    IMG_20140711_194723.jpg

    I also have to find a good way to mount the stops.

    Overall I'm super excited.
     
    #1023 Lee Saferite, Jul 12, 2014
    Last edited: Jul 13, 2014
    mybuild14 and Robert Hummel like this.
  4. Robert Hummel

    Robert Hummel Custom Builder
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    Nice work, all the extras and fine details will save a ton of head scratching.
    We'll done !
     
  5. Lee Saferite

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    I had an "oh s#!t" moment tonight when I hooked up the X axis for the first time and had the polarity for both motors set the same. The machine tried to rip itself in two. :eek:
     
  6. Robert Hummel

    Robert Hummel Custom Builder
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    Lol bin there hahaha
    I did the same with my laser v build, glad the motors stalled before bending anything
     
  7. Robert Hummel

    Robert Hummel Custom Builder
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    Oh and for me it's always bin, if standing in front of my mill.
    Y Axis = forward backwards
    X Axis = left right
    And Z lol up down ;)
     
  8. Lee Saferite

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    Since I'm still in the middle of wiring up the electrical box and limit switches, I haven't wired up the e-stop yet. I had to listen to the horrible sound of the pinion spinning against the belt.

    As for the XYZ thing, I always think of X first and the front to back axis as the first as well.
     
    Robert Hummel likes this.
  9. Robert Hummel

    Robert Hummel Custom Builder
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    It could be that I'm a Mach3 user also and that's how they have the jog interface setup so I always went with that :D
    Really all that matters is that you end up with the finished results you expected ;)
     
  10. Tweakie

    Tweakie OpenBuilds Team
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    Hi Lee,

    It is conventional to have the Y axis 'towards and away' and the X axis 'left and right' as you stand at the machine.
    This is the same convention by which most CAD / CAM software produce their GCode but the choice is yours and there is nothing wrong with using conventional or not.
    However, there is some advantage with having the X axis as the axis with the lowest total mass. This enables better overall machine performance when producing work (such as images, lithophanes etc.) which requires a 'raster scan' type of movement.

    Tweakie.

    right hand.jpg
     
    Daryl likes this.
  11. MartinB78

    MartinB78 New
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    Thanks for that. I am very new to this and possibly naively thought that my machine would come with a full set of build instructions and a wiring diagram purpose made to the supplied components, Wrong! Using OpenBuilds YouTube video I have constructed the Machine but my weakest aspect is electrics and I am really struggling, is there anywhere I can go to, to get a wiring diagram or instructions for my configuration:
    3 x Nema 23 Motors
    1 x Nema 17 Motor
    CNC USB Controller MK2/4
    4 x TB6600 Drivers
    Professional Power Supply
    4 x Micro Switches
    I have watched the above video from GRAYUK but straight away the terminals he talks about have different names to ones on my controller! Thanks,
     
  12. Robert Hummel

    Robert Hummel Custom Builder
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    I have this for the driver
    image.jpg
     
  13. GrayUK

    GrayUK Openbuilds Team Elder
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    Hi Martin.
    I'm sorry he wasn't so helpful there. I know you probably have, but have you looked at his FAQ section?

    Gray
     
  14. GrayUK

    GrayUK Openbuilds Team Elder
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    Don't know if you will find anything enlightening here.
    http://www.cnc4everyone.com/

    I guess you could contact PlanetCNC direct. He is very helpful.

    Gray
     
  15. bobt

    bobt Well-Known
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    Most people use of the router is based upon a "Cartesian Plane". Where the movement away from zero is always positive. So if you lay out the "Cartesian Plane" then use the upper right quadrant as your plotting point you will have the methodology used in most CNC machines. Also the directions of movement are usually based upon standing in front of the machine. Remember that this design is based upon the 50's and 60's and there was no such thing as "new math".

    Bob
     
  16. Paruk

    Paruk Journeyman
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    Mark, when would you have everything in store? I would love to build the larger OX, but some things are out of stock? I'm in Thailand, and sourcing things here is to say it friendly, extremely difficult.
     
  17. Paruk

    Paruk Journeyman
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    Thanks Chris, for the offer. But What's missing for me at the moment are the v-slot 20x80 and the nema 17 stepper motor. The plates and the other stuff I can machine here.
     
  18. Dat Chu

    Dat Chu New
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    I try opening up the "OX Plates True Circles_mm.dxf" file in the Files section in DraftSight but the objects are all messed up. Individual holes aren't holes and the outlines seem to merge at random with the holes. Can someone help me export that dxf file to svg? Has anyone have much luck opening the dxf file in Draftsight?
     
  19. Jay_r

    Jay_r New
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    Try librecad. I had trouble with DS and iirc, librecad worked.
     
  20. Mark Carew

    Mark Carew OpenBuilds Team
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    Hello @Prauk the nema 17's will be complete in a few days and will be added to the part store.
    The 20x80 V-Slot is going to be a few weeks.
    We apologize for the delay but please know that we are working hard to get everything back in stock as quickly as possible.
    Lots of parts have been updated in the last two days so be sure to check it out.
    Thank you for your patience and your support to OpenBuilds!
    Mark
     
  21. Sonny

    Sonny New
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    Hello everyone, I am mechanichally inclined and a hobbyist woodworker. I'm new here and planning to build a cnc router (most probably the OX). Thank you Mark for sharing the build and details it is very generous of you.
    I do however hope to make a full 4' x 8' one with a 1617 bosch router and hopefully it is possible, my question after going thru most the messages in this topic is.... Can I use a stiffer aluminum for the gantry cross-beam (z-axis) maybe the 25-5010 from 80-20 inc. http://8020.net/T-Slot-5.asp
    I plan to use it mainly to cut sheet goods to dimension and shapes..
    I know I would be having problem with the groove slightly wider for the wheels to slide onto, but is there another option that you can suggest? I do wish to get most parts here but to save a bit, the extrusions might be sourced locally here as I am in the Philippines.
    Mabuhay (long live)......
    Sonny
     
  22. MartinB78

    MartinB78 New
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    Hi Gray,
    Tthanks very much for your help, the hyperlink was helpful, I now know a hell of lot more about stepper motors than I ever did, full movement, 1/2 movement and micro movement! Anyway PlanetCNC have sent me a wiring digram which looked perfect all the terminals on my Driver and Controller named 'Common Cathode' but then I scrolled down to find another diagram labelled 'Common Anode' the only difference appears to connecting GND in Cathode and *5v in Anode. I feel I'm getting really close to being able to wire them up but just wanted to check, does it matter which option I go for?
     
  23. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Welcome Sonny,

    The problem with what you are proposing is that the V-slot wheels are not compatible with the 8020 shapes. The V-slot wheels are designed to fit down snugly between the beveled edges of the rail which holds the carriage assembly firmly into alignment. This won't work with the square edges of the 8020 rail. As an alternate suggestion to achieve your goal, I would note that the gantry beams do not necessarily have to be made of the slotted aluminum rail. The gantry beams can be made of locally sourced aluminum tubing with V-slot rail mounted on the face. This will also allow you to use a smaller, more economical size of V-slot rail as the strength of the system will be coming from the tube, not the V-slot rail. Based on the weight of your router, I would also suggest a double beam gantry with the router riding in the slot between them.
     
  24. Lee Saferite

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    I found these wheels a while ago. They'll supposedly work on larger 15 series extrusion from 8020
     
  25. Sonny

    Sonny New
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    Rick, thank you for the reply. Very much appreciated especially having another extrusion to stiffen the cross beam on the gantry.


    Lee the link definitely very helpful, thank you very much. Now I believe I might end redesigning the gantry sides just to be able to make use of these. I do hope everything else need not be changed though....
     
  26. GrayUK

    GrayUK Openbuilds Team Elder
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    Hey Martin.

    Glad to have helped there. :)

    Now, what you are talking about here, is seriously out of my league. You really need to talk to someone like Tweakie. This is his, and others, area of expertise.

    I'm sure he'll get wind of this conversation and chip in here. :thumbsup:

    Won't you Tweakie? :cool:

    Gray
     
  27. Dat Chu

    Dat Chu New
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    I tried opening the file in librecad. Still has the same issues. Some holes are incomplete. Can someone help me convert Ox Plates True Circles_mm.dxf to a format that can be open by Draftsight or other similar programs?
     
  28. asb_79

    asb_79 Well-Known
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    The DXF I used to have my plates waterjet cut is attached in this forum post, http://www.openbuilds.com/threads/waterjet-cut-aluminium-ox-gantry-plates.389/

    The circles are not true circles, but many segments. I used Draftsight to read it.

    Cheers
    Anthony
     
  29. Tweakie

    Tweakie OpenBuilds Team
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    Hi Martin & Gray,

    It is perhaps a point best taken up with PlanetCNC - Although I can see possible applications with 'common anode' all of my machines are 'common cathode' and that is the system I would recommend you adopt.

    Tweakie.
     
  30. asb_79

    asb_79 Well-Known
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    I designed a 3D printable clamp to suit my Makita RT0700C Router but it would work with any Router or Spindle with a 65mm body diameter.

    I can alter the design for other diameters if requested.

    I've uploaded the STL's to thingiverse, http://www.thingiverse.com/thing:398695/#files

    Cheers
    Anthony
     

    Attached Files:

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