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OpenBuilds OX CNC Machine

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

  1. DiggerJ

    DiggerJ Journeyman
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    Give them a bit of time, they are very busy, but produce and ship fast.
     
  2. DiggerJ

    DiggerJ Journeyman
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  3. Chris Laidlaw

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    Thanks Digger... I was busy making and shipping a set of plates to Alaska today.
    Building and using an OX CNC seems like a perfect project for the long Alaska winter that is just around the corner.
     
  4. dougsnash

    dougsnash New
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    Let me add that I purchased a set of OX plates from Chris through E-Bay and there are beautiful, he really goes all the way in his manufacturing.

    Doug M
     
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  5. Larry_AK

    Larry_AK New
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    And I thank you Chris, sounds like the plates will be hot off the mill to warm up that long Alaskan winter. But I must say winter is one of my favorite times of year!
     
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  6. Reinhard

    Reinhard New
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    I just got a set of plates from Chris.... they look great!!
     
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  7. Astropoy

    Astropoy New
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    Just curious, is the shipping charges based on weight of whole order? I'm thinking about getting other parts such as nuts n bolts from local supplier just to shave a few dollars off the shipping. Is it worth it?
     
  8. Robert Hummel

    Robert Hummel Custom Builder
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    Little Fiber OX update for you guys :)

    LD3X installed and mounted along with some HDPE wire clips to keep things in place ;)
    image.jpg
    And here a short clip of me testing and calibrating GRBL :D
     
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  9. Dave M

    Dave M New
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    Nice Robert

    How did you connect these steppers? I have purchased the same from FuzzTech. No connect on Black and White center taps? Keep up the excellent work!
     
  10. dddman

    dddman Journeyman
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    @Dave M Exactly, you have one coil on red and yellow and the other coil on orange and blue
     
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  11. Dave M

    Dave M New
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    Thanks DDDman
     
  12. Robert Hummel

    Robert Hummel Custom Builder
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    Great motors :)
     
  13. dddman

    dddman Journeyman
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    They sound good eh?
     
  14. Robert Hummel

    Robert Hummel Custom Builder
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    Yes indeed, they are set to the max the little stepsticks can pump out and @1/16 micro stepping.
    No issues as of yet
     
  15. SlowBipe

    SlowBipe New
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    I am in the process of building something like an OX. Right now I thought I would post some details on my mount for my spindle. I have chosen to use a Bosch Colt. I first cut out a basic mount out of 1/4 inch MDF. I will post a picture of that. I managed to cut this out on my Phlatprinter. Not very accurate but it worked. IMAG0387.jpg

    Then I designed a mount with a port for a 4 inch dust collection time hose. This is also made of 1/4 inch MDF and painted red. I have the frame for the dc boot in there as well. Still need to add the skirt. Magnets are installed to hold this on. IMAG0401.jpg

    I added some partial board to the table and surfaced it as a temporary table to cut on while I work on my vac. Here are some more pictures of the mount. I designed the mount to have about a 2.5 inch offset for the dust collector. This gets it out of the way of the front of the cutter but doesn't take up a lot of width on the left side. I loose about 2 inches of cut width, but had 31 inches to start with. Now I have about 29". I can also cut about 50 inches long. The mount is extremely rigid, much stronger than the machine itself.
    IMAG0410.jpg

    IMAG0411.jpg

    Finally here is a picture of the whole project so far. My electronics are in a controller box under the table.

    IMAG0413.jpg

    It is cutting pretty good right now using LinuxCNC. Tried using an old CNCUsb Mark I board that I have first and did not like the results.
     
  16. Mark Carew

    Mark Carew OpenBuilds Team
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    Great looking mount @SlowBipe! Once you get the OX up and running you could loose the MDF and (using slow small passes) cut one from aluminum to gain much more rigidity for the router.
    Nice job on the 90 degree brackets to mount the machine to the table.
    Keep up the good work really looks nice and thank you for sharing
    Mark
     
  17. Nigel King

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    Hi all, I have just completed my OX using aluminium plates from a guy in Australia (I'm in New Zealand). Everything mechanical is working great. Would anyone be willing to share their grbl settings for the standard OX, I'm using all of the parts e.g. stepper motors listed on the Openbuilds site.
     
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  18. Robert Hummel

    Robert Hummel Custom Builder
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    I have my acceleration set to 100
    Seek set to 10000
    X and Y set to 53.33
    Z set to 400

    This is using drivers set @1/16 step rate
     
  19. SlowBipe

    SlowBipe New
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    Thank you mark for the positive comments.

    It turns out that the MDF mount as designed is extremely rigid. I cannot register any flex in the structure at all. I expect that at some point I will try cutting Aluminum, but for now I need to focus on getting a Vacuum table built with removable spoiler boards. I plan to relieve the spoiler where my cuts are so that the bit can fly through foam at very high rates of speed (400 ipm) without interference with the spoiler board. I will switch out 1/4" spoiler boards as I switch out parts to produce. I also still need to suspend my dust collector hose from the ceiling on a track and come up with a mount to hold the monitor in the corner of the table.

    I am also getting more flex in the middle of the cross axis than I like. Thinking that I may tap and place a few screws between the 2- 20x60 beams to make them more rigid. I tried double sided tape between the beams before construction, but they just separated as the v-wheels are just far enough apart to pull them apart about .020 inch.

    I am running about 45 volts with Nema 24 motors and have plenty of torque even at high speeds.

    The brackets that I used to mount the rails to the table are just 1/4 inch thick by 3 x 5 inch Aluminum Angle Iron. Turns out to be a pretty cheap solution and makes for a very rigid rail all along the 1500 mm length.
     
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  20. Larry_AK

    Larry_AK New
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    Just like to say, my plates from Chris showed up today and they look GREAT!
     
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  21. Nigel King

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    Awesome, thanks Robert.
     
  22. Paruk

    Paruk Journeyman
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    With the fantastic guidance and help of David, I've got the precision of cutting down to less than 0.02mm, making (nearly) perfect squares and circles. Even a 45 degrees turned square was coming out perfect. Now some serious cutting should be possible.:thumbsup:
     
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  23. Robert Hummel

    Robert Hummel Custom Builder
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    Np ;)

    Here it is, the surprise part of the Fiber OX.
    Pew Pew! It's a frickin laser man!
    The 445nm OX :D
    image.jpg
    G-code sender
    image.jpg
    Final test burn to check calibration :thumbsup:
    image.jpg
    And the final results :cool:
    image.jpg
    :rolleyes:
     
  24. Paruk

    Paruk Journeyman
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    Nice man, laser is my next project for my OX. I will knock on your door when it comes to it (with your permission, of course).:)
     
  25. Paruk

    Paruk Journeyman
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    Had to see if an other program would give same results, so its at least repeatable over the programs I'm using. It is.:)
     
  26. Nigel King

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    Oh and before I forget, if there is anyone else in NZ considering purchasing from Openbuilds, don't hesitate! These guys are great and the shipping costs are excellent considering it is shipped from the US. I'm on my third order already and not a tee nut out of place. :) I even used these guys as an example of great customer service at a seminar I was at last week.
     
  27. DiggerJ

    DiggerJ Journeyman
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    Now I can't wait to get mine finished. Room should be done by weekend (fingers crossed), and then I can finish setting it up.
    3D printer parts should hopefully be here by then as well.
     
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  28. Rich C

    Rich C New
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    Robert Hummel, that is sweet. I would love to get a BOM to add that to my OX. Plus maybe some pics, short writeup/tips, etc... :)

    Rich
     
  29. David the swarfer

    David the swarfer OpenBuilds Team
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    to summarise what we were discussing..... (-:

    when you have built your machine, you need to calibrate it. for decent threaded rod drives, this is easily calculated and will be as accurate as the threads.
    for belts, well, they stretch...

    so, first calculate the mmperstep from a formula like
    mmPerStep = pulleyteeth*beltpitch / stepsperrev
    for example 20 * 3 / 3200 = 0.01875 mm/step
    and put that value into your controller . now you will get good movement that you can use for tuning max speed and acceleration values. You must make sure you are not missing steps before you do the final calibration.

    NOTE: GRBL and other controllers like to use step/mm, so use these formulas
    step/mm = stepsperrev / beltpitch / pulleyteeth
    and then
    newstep/mm = step/mm * commanddist / actualdist

    However, when you pulled that belt tight, it stretched, a little, but this means that your commanded moves are coming out a little long.

    So you need to command a long move that you can measure accurately, and then adjust the mm/step value to adjust for the belt stretch.

    so, zero everything and give a command like
    G21 G1 X200
    which will command a move of 200mm, but in reality may come up short, say 199.5mm (no, that plastic school ruler is not good enough for measuring this!)

    now calculate a new mm/step value using
    newmmperstep = oldmmperstep * actualdist/commanddist
    or in this example
    newmmperstep = 0.01875 * 199.5/200
    = 0.018703125 mm/step

    now your X movement will be within 1 mmperstep of correct over 200mm.
    (your machine cannot go to a position that is not a multiple of your mm/step, so in fact you should do this test with a command distance of an exact number of steps, ie a multiple of your initial mm/step value)
    remember to use as many decimal digits as you can.

    Now do this for each axis in turn, they will all be different, even the 2 sides of a dual Y drive will be different since the belts are different tensions.

    now before anyone complains about the metric system, this all works just fine in inches, however, your machine will be much more accurate if you calibrate it in the units that the leadscrews/belts use. The units you use in your Gcode are then up to you, but at least your machine is as good as it gets!

    maybe this info needs to be a resource? not sure how to do that.

    BTW Mach3 has a wizard that does this calculation for you

    and there is a rumour that a simular thing may become available for GRBL systems.
     
    #1649 David the swarfer, Oct 22, 2014
    Last edited: Oct 8, 2015
  30. Paruk

    Paruk Journeyman
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    I agree with that, David. A simple spreadsheet would do the trick, which can be published under resources. If you don't have the time for it, I'm willing to take up the challenge and pour the thing in a spreadsheet. I think I understand how it works now, thanks to your excellent guidance and patience. I will first pass it to you for editorial input, in that case. Let me know.

    Maybe it is even possible to account for a certain amount of stretch? By measuring original cutting length and the length after mounting it and stretching it?
     

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