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Yet another 1x1 Sphinx

Discussion in 'CNC Mills/Routers' started by Andreas Bockert, Oct 25, 2017.

  1. Andreas Bockert

    Andreas Bockert Journeyman
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  2. Andreas Bockert

    Andreas Bockert Journeyman
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    Worked on 2nd Y-axis today. It sure is faster when you've figured out the pitfalls...
     
  3. Andreas Bockert

    Andreas Bockert Journeyman
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    On to the Z-axis. I had a hard time fastening the timing pulley to the lead screw. In the end I managed to strip the threads of the lock screw... ;-(

    If anyone is listening. There is some slack between the lead screw and the bearings. Have you done anything about this?
     
    #3 Andreas Bockert, Oct 26, 2017
    Last edited: Oct 26, 2017
  4. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    That is to make assembly go smoother. With full/true size rods it extremely difficult to fit the bearings on the screws and then slide them back into the pockets. If the gap is bothersome try wrapping the screw with teflon tape prior to installing the bearing.
     
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  5. Andreas Bockert

    Andreas Bockert Journeyman
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    Some electronics. Lets just call the case a, hrmmm, prototype...

    Raspberry with Protoneer-hat and DRV8825 drivers. We'll see how long these will take me. I have a feeling I'll need to spring for some proper drivers before everything is said and done.
     

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  6. Andreas Bockert

    Andreas Bockert Journeyman
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    Thanks for the clarification. It shouldn’t give any noticeable accuracy issues I hope.
     
  7. Andreas Bockert

    Andreas Bockert Journeyman
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    Did as much assembly as possible on X. It seems like when using Chris plates you can't use a 1mm shim on the outside. Otherwise the lock nuts won't reach the nylon properly. I simply skipped them.

    Also mounted my router. Not sure where I saw the design but it's definitely stolen.
     

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  8. Andreas Bockert

    Andreas Bockert Journeyman
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    Began assembly. Attached all the axes and started working on the frame. At this point I have an 1-axis CNC.
     

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  9. Andreas Bockert

    Andreas Bockert Journeyman
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    More work with the assembly. Spent quite some time shimming in order to get proper angles.

    It's time to start thinking about wiring. I'm to lazy to move the gantry all the way to the other side and want to check movement before tightening everything down.
     
  10. Andreas Bockert

    Andreas Bockert Journeyman
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    Build has been slow since I blew my back and have to take it easy for a while. I removed the Lead screws from Y in order to check for any pinching. Movement was good but some of the wheels (on the excenters) didn't have proper contact.. It's a hassle to adjust when the gantry is assembled.
     
  11. Andreas Bockert

    Andreas Bockert Journeyman
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    When I pull my gantry all the way back to the plates I get a gap of about 3mm on one side. You can look at the pictures.. Any suggestions?

    I'm guessing that my X axis C beam isn't 100% square or if I possibly mounted the Y axis C-beams to close to each other...

    Any suggestions on fixes? I would really like to avoid disassembling the gantry...
     

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  12. Andreas Bockert

    Andreas Bockert Journeyman
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    Added 0.2mm shims (from an old soda can) to X beam, a lot squarer now but then the next problem surfaced... I originally squared the base with the gantry in place. But the gantry wasn't square which pulled the beams... I had to resquare the base again..
     

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  13. Andreas Bockert

    Andreas Bockert Journeyman
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    Finished the base frame. Originally I was planning to follow @Kyo's original design but with 80x20 as a frame and 60x20 as supports. Then I hade a change of heart after seeing one of @Savvas videos and decided to use the base simliar to his.

    I simply spaced out the 80x20 and 60x20 evenly and fastened with 90deg blocks. This way I didn't need to cut any aluminum and squareness wasn't as critical.

    Once a wasteboard is attached I think it will be plenty rigid.
     

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  14. Andreas Bockert

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    It's alive! I wired up X/Y and that found one of the DRV8825 was broken. One of the Y-screews simply didn't travel the same distance as it's cloned buddy...

    I created a dead simple pen holder from a piece of wood, a nylon spacer and some rubber bands. Works fairly well...
     

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  15. Andreas Bockert

    Andreas Bockert Journeyman
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    So far so good. I seems to draw pretty accurately. I'm not having that much much with Chilipeppr at the moment. It seems like half the widgets on the page are broken.

    Got the final piece of cable for Z and soldered a connector to it. (Why is it only once you get to the last soldering it starts to look halfway decent?)

    I'll hopefully be able to wire up Z later tonight or tomorrow...
     
  16. Andreas Bockert

    Andreas Bockert Journeyman
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    Got Z up and running and made a few cuts. Since the waste board isn't attached Z is all over the place but otherwise it looks pretty good.

    Also carved my first part. (a holder for limit switches). This made me realize that this thing generates a lot of dust.. A dust shoe moved up the priority list.
     

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  17. Andreas Bockert

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    Did some more tuning and found weird slack in my Y's. So I ran the gantry back and forth and one of the lead screws is bent. :-(

    Just ordered a new one and be done with it...
     
  18. Andreas Bockert

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    I've done a bunch tightening. The new lead screw has arrived and I ordered a set of DM542 drivers. To be honest, the DRV8825 are doing a pretty good job so far and I'm not really sure I need the beefier drivers... But since I got them I might as well wire them in.

    If you're considering repeating a build like this you could very well try with the DRV8825 first and see if they serve you well...

    I've managed to do some pretty good cuts as well. Check out this knob. (Planning to use it for hold downs)
     

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  19. Andreas Bockert

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    Started working on the wasteboard. Routed out some countersink for M5 heads on the top. Then flipped it around and routed out holes for 80 T-nuts... Now comes the fun part of drilling 320 tiny holes for the t-nut teeth. ;-)
    '
     

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    #19 Andreas Bockert, Nov 14, 2017 at 2:09 AM
    Last edited: Nov 16, 2017 at 7:07 PM
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  20. Mark Carew

    Mark Carew OpenBuilds Team
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  21. Andreas Bockert

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    Finished my 320 holes and hammered in 80 t-nuts (with a dab of hot-glue, not sure if it will help but it couldn't hurt).

    Also cut some threaded rod and created a prototype hold-down system. Not pretty but the stock doesn't move... Obviously, I need to fabricate some prettier hold-downs... I'm thinking plywood...
     

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