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Nut Block Stripped MAYBE?

Discussion in 'CNC Mills/Routers' started by Mike Nieman, Aug 1, 2021.

  1. Mike Nieman

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    Hi, I have a Openbuilds 1050 been working great for a few years now. But now the left side of my Y is not moving the same pace (dragging) as my right side. Could it be that the Nut Block is stripped. I don't see any other issues. The motors spin ok, the rail turns on, I put a new coupler on thinking that was the issue. I am clueless. Any suggestions? I just ordered 2 Nut Blocks.
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    I'd think it's unlikely, but a stripdown is the only real way to check.

    May rather be:
    - slightly loose setscrew on shaft coupler/pulley causing slippage
    - intermittent wiring issue
    - acceleration / max rate value tuning needed (stalling during rapids on one side)
    - maintenance time: readjust wheels, check for binding, clean dust off, lubricate leadscrews with PTFE dry lubricant (never use oil), etc
     
  3. Mike Nieman

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    Peter, THANK YOU for the quick response. I sprayed PTFE on the lad screw and I checked all wiring and re-tightned but did not help. I did notice a few wheels are tight and I tried everything with the eccentrics but does not help. I just ordered new wheels and eccentrics. Do you know any experts in Southern California that would be willing to look at it if I can't fix it?
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    You'll figure it out :)

    While you wait on parts, disconnect the motors and just test them in isolation: See docs:blackbox:faq-identify-motor-coils [OpenBuilds Documentation] - maybe over time a terminal's gone loose or a wire broke off somewhere inside the insulation as mentioned earlier:


    Also:

    Did you test with lower Max Rates yet?
     
  5. Mike Nieman

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    Peter, I isolated the issue to one Nema 23 motors. I separated both motors from the lead screw and noticed one motor hesitating. THANK YOU so much for your help.
     
  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Use the link above to check the wiring. Motors very very rarely go bad. Wiring on the other hand: Loose terminals, pinched insulation into terminal, stripped to short, wire broken off somewhere inside the insulation on a stress point (repetitive bending / strain) - that's more likely

    And do check this too - if it falls behind when it gets up to speed in particular
     
    #6 Peter Van Der Walt, Aug 5, 2021
    Last edited: Aug 5, 2021
  7. Mike Nieman

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    Peter, you are the best.... it was a green loose wire on the back of the blackbox for the y motor.

    thanks Mike
     
    Peter Van Der Walt likes this.
  8. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Yay! Glad you found it!
     

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