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Solved Right size Z axis not playing nice

Discussion in 'Troubleshooting' started by Rat_Patrol, Apr 20, 2017.

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  1. Rat_Patrol

    Rat_Patrol Member

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    It clearly isn't moving as much as it should, as in not raising up equal to the other side. The x axis keeps going out of manual level, from a 2mm gap on the left to dragging on the glass 3/4 to the other side. I manually level it and within 5 minutes, it back to this.

    Is this a stepper motor or driver issue?
     
    #1 Rat_Patrol, Apr 20, 2017
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    With the R1 it is probably a motor.
    With the R1+ it could be either :)
    Swap drivers between motors and if the problem moves it is the driver.
     
    #2 mark tomlinson, Apr 20, 2017
  3. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    (because the beta and R1 use a single stepper driver for both motors and the R1+ uses one for each)
     
    #3 mark tomlinson, Apr 20, 2017
  4. Rat_Patrol

    Rat_Patrol Member

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    Its a Plus.

    Just pulled the motor out, "seems" fine (nothing obviously wrong by sight or feel). I swap the drivers, see what happens.
     
    #4 Rat_Patrol, Apr 20, 2017
  5. Rat_Patrol

    Rat_Patrol Member

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    OK, swapped drivers, same issue. Even replaced the limit switch on that side, no joy.

    Best place to get a motor?
     
    #5 Rat_Patrol, Apr 20, 2017
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Amazon probably.
    Could still be the RAMPS itself (if you have a spare) but I'd agree it is most likely the motor.

    Any Nema-17 in the ball park for torque would work, Robo probably has them or something like this:

    https://www.amazon.com/gp/product/B00QEXSCE8

    (1.8 deg step angle is what you want)
     
    #6 mark tomlinson, Apr 20, 2017
  7. Rat_Patrol

    Rat_Patrol Member

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    Do I need to get a version with the lead screw integrated, like the R1+?
     
    #7 Rat_Patrol, Apr 21, 2017
  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yes, for the plus you need integrated leadscrews because converting the non-integrated ones to use integrated leadscrews is doable, but a pain. If you get that motor and leadscrew from Robo you can just do a direct swap otherwise you probably should just get a pair of leadscrew motors from where ever you want and modify the firmware to match. There are alternatives:

    http://community.robo3d.com/index.php?threads/alternative-to-the-lead-screw-upgrade-kit.7144/
     
    #8 mark tomlinson, Apr 21, 2017
  9. Rat_Patrol

    Rat_Patrol Member

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    #9 Rat_Patrol, Apr 21, 2017
  10. daniel871

    daniel871 Well-Known Member

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    #10 daniel871, Apr 21, 2017
    Robert55 and mark tomlinson like this.
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I don't remember the Robo ones being TR8x8, but it has been a long time since we messed with their kit.
    Like @daniel871 said -- email Robo directly.
     
    #11 mark tomlinson, Apr 21, 2017
  12. Rat_Patrol

    Rat_Patrol Member

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    While I wait for Robo to get back to me, I think I'll switch the motors, make sure the issue follows the motor.
     
    #12 Rat_Patrol, Apr 21, 2017
    Geof and mark tomlinson like this.
  13. Rat_Patrol

    Rat_Patrol Member

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    OK, this is getting screwy.

    The problem is all over the map.

    Video of what it is doing:

     
    #13 Rat_Patrol, Apr 21, 2017
  14. Rat_Patrol

    Rat_Patrol Member

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    The low side is STILL on the right (after motors swapped) right now, but it did go to the left for a while after swapping motors.

    Thoughts?
     
    #14 Rat_Patrol, Apr 21, 2017
  15. daniel871

    daniel871 Well-Known Member

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    So no bed leveling sequence at all? Did you move to Mesh leveling? Is Mesh active?
     
    #15 daniel871, Apr 21, 2017
  16. Rat_Patrol

    Rat_Patrol Member

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    Sorry, yes mesh installed and active.
     
    #16 Rat_Patrol, Apr 21, 2017
  17. Rat_Patrol

    Rat_Patrol Member

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    The horrible noise when the sequence starts is what has me most concerned, and I am willing to bet that is what is throwing off the X axis leveling, as both motors seem to almost hit a block, but then work just fine. When I control with S3D, I can go up and down all day without issue.
     
    #17 Rat_Patrol, Apr 21, 2017
  18. Rat_Patrol

    Rat_Patrol Member

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    What is also weird: When I swapped the motors, I also had to move the couplings that the home switches clamp to. The lead screw would get jammed half way in, like the pitch was wrong. Did that on both sides. Once I swapped them too, they ride fine.
     
    #18 Rat_Patrol, Apr 21, 2017
  19. Rat_Patrol

    Rat_Patrol Member

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    OK, so its working now, at least for the moment.

    It seemed that something in the starting script was jamming the z axis motors. I junked it and started from scratch. What is weird is I isolated the issue to the homing command, but when I re-wrote it as G28 X0 Y0 Z0, it works. It was just G28 before. Perhaps it was just some kind of bug in the new mesh firmware?
     
    #19 Rat_Patrol, Apr 21, 2017
  20. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Anything is possible.
     
    #20 mark tomlinson, Apr 21, 2017
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