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Unanswered Y axis shifting during print.

Discussion in 'Troubleshooting' started by midijerk, May 31, 2015.

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  1. midijerk

    midijerk Member

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    Had printer for a while now had many successful prints. I use it on a daily basis. A couple weeks ago not every print but ever so often it would start shifting during the print. I'd just cancel and restart and itd be fine. but now every print it is doing it. Can someone help me resolve this please just want it back up and running. IMG_0854.jpg
     
    #1 midijerk, May 31, 2015
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    1) Loose Y belt
    2) Loose set screw on the motor drive cog for the Y belt
    3) Something blocking the Y travel (a jam). See if you can manually move the Y full range.
     
    #2 mark tomlinson, May 31, 2015
    Mike Kelly likes this.
  3. Mike Kelly

    Mike Kelly Volunteer

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    Also might be a bad bearing causing it to stall. Does it move relatively freely by hand?
     
    #3 Mike Kelly, May 31, 2015
  4. midijerk

    midijerk Member

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    I can move the table back and forth all the way. How do you tell if its one of the other 2?
     
    #4 midijerk, May 31, 2015
  5. midijerk

    midijerk Member

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    It feels kind of sticky if that makes sense. Feels more on the rails then the belt.
     
    #5 midijerk, May 31, 2015
  6. Mike Kelly

    Mike Kelly Volunteer

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    Lift up the bed to see if the belt is tight. It's held on by magnets
     
    #6 Mike Kelly, May 31, 2015
  7. midijerk

    midijerk Member

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    Yes the belt is tight.
     
    #7 midijerk, May 31, 2015
  8. Mike Kelly

    Mike Kelly Volunteer

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    Try lubricating the smooth rods with something like lithium grease or machine oil.
     
    #8 Mike Kelly, May 31, 2015
  9. midijerk

    midijerk Member

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    how do you tell if you belt is all the way tight?
     
    #9 midijerk, Jun 1, 2015
  10. Stephen Capistron

    Stephen Capistron Active Member

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    It really is a feel thing. When strum it should have a good twang to it.

    You don't want it so tight that it deflects the parts it connects to, but tight enough that there is no slop in movements. The belt itself has kevlar in it and can handle quite a bit of tension.
     
    #10 Stephen Capistron, Jun 2, 2015
  11. Mike Kelly

    Mike Kelly Volunteer

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    That's kinda tricky. The drive shaft will bind.

    Generally you just don't need it to be insanely tight.
     
    #11 Mike Kelly, Jun 2, 2015
  12. midijerk

    midijerk Member

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    Got some grease to try today. Will update later. Pretty sure belt is tight.
     
    #12 midijerk, Jun 2, 2015
  13. midijerk

    midijerk Member

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    Grease didnt work. It keeps getting caught almost. Like it catches and then goes. Idk. Need it running.
     
    #13 midijerk, Jun 2, 2015
  14. Mike Kelly

    Mike Kelly Volunteer

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    Sounds like a bad bearing. Submit a replacement part request
     
    #14 Mike Kelly, Jun 2, 2015
  15. midijerk

    midijerk Member

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    Just ran a print to see and its hard to tell but is it possible for the gear on the belt to skip a tooth? idk how its keeps shifting forward during print. I Keep hearing a grinding noise when it does it.
     
    #15 midijerk, Jun 2, 2015
  16. Mike Kelly

    Mike Kelly Volunteer

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    if the belt is tight it won't skip. Can you move the bed freely by hand with the power off?
     
    #16 Mike Kelly, Jun 2, 2015
  17. midijerk

    midijerk Member

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    I can for a little bit then it gets stuck until i go back and come forward again. I get a lot of resistance when pulling the bed to me.
     
    #17 midijerk, Jun 2, 2015
  18. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    There is a situation, but not normal, where the belt can skip.
    1) lift the bed from the magnets so you can see the Y belt (note the pinions in the center that it is moving around).
    2) move the bed full extent Y axis and watch the belt on the center pinions.

    Is the belt staying in the center or is it moving up and down on the pinion as the bed moves back and forth?
    It should NOT move up/down. If it does it will bind on the rim of the pinion. When that happens it will make a noise and skip.

    This can happen if the drive cog on the motor shaft is too low or too high on that shaft.

    edit: this happened to me and drove me nuts trying to find it.
     
    #18 mark tomlinson, Jun 2, 2015
  19. midijerk

    midijerk Member

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    #19 midijerk, Jun 2, 2015
  20. midijerk

    midijerk Member

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    Idk if you can tell from that or not. Looks like it might move a little and it is close to the top of the rim.
     
    #20 midijerk, Jun 2, 2015
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