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Unanswered Strange noise just started, aka Stepper drive from Hades

Discussion in 'Troubleshooting' started by John in MS, Jun 6, 2016.

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  1. John in MS

    John in MS Active Member

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    I hope this is showing to allow you to hear the sound. I just installed a new extruder fan Friday and it was working great until yesterday when a grinding sound began. Any idea? It is not filament related as I took it out to make the video

    Thanks
     
    #1 John in MS, Jun 6, 2016
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Looks like the extruder stepper is skipping/dropping steps.

    If you just position it in the middle of the bed and get it off the plate can you heat it up and extrude normally?
     
    #2 mark tomlinson, Jun 6, 2016
  3. John in MS

    John in MS Active Member

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    I will try after work. Thanks for the suggestion
     
    #3 John in MS, Jun 6, 2016
  4. TomerO

    TomerO Member

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    Does this happen only when printing? Does it begin from the start? It sounds like either a motor is stuck/have something in it or a cable touching a fan (sounds like the 2nd to me).
    Your extruder stepper does look weird though. Why is it shaking like that?

    Sent from my Nexus 5 using Tapatalk
     
    #4 TomerO, Jun 6, 2016
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Skipping/missing steps most likely.

    Those are pretty much the symptoms for a bad or out of tune stepper driver.
     
    #5 mark tomlinson, Jun 6, 2016
  6. John in MS

    John in MS Active Member

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    New video, trying to simply get filament to come out. Okay is the stepper out or stuck? How hard are these to install?
     
    #6 John in MS, Jun 6, 2016
  7. Geof

    Geof Volunteer Moderator
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    I think I'd pull the stepper off and see if it spins free. If yes something in the hotend is jamming it up. If it spins remove the hotend and try.
     
    #7 Geof, Jun 6, 2016
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  8. John in MS

    John in MS Active Member

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    will do. thanks
     
    #8 John in MS, Jun 6, 2016
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Still a good chance it is the stepper driver. Not the motor. But... Check it and be sure

    Sent from my Xtreme Play Tab v2 using Tapatalk
     
    #9 mark tomlinson, Jun 6, 2016
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  10. John in MS

    John in MS Active Member

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    stepper driver? Little confused on the parts. Is there a diagram?
     
    #10 John in MS, Jun 7, 2016
  11. TomerO

    TomerO Member

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    The stepper driver is one of the parts on the RAMPS board at the bottom.
    Did you try to test the stepper disassembled?

    Sent from my Nexus 5 using Tapatalk
     
    #11 TomerO, Jun 7, 2016
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  12. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Little green cards in this photo

    Ramps with stepper.jpg
     
    #12 mark tomlinson, Jun 7, 2016
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  13. John in MS

    John in MS Active Member

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    Sorry not yet but hopefully tonight
     
    #13 John in MS, Jun 7, 2016
  14. John in MS

    John in MS Active Member

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    I took off the bottom and checked the wiring. Everything is secure, and don't know of anything that can be on the board to get it working. I have seen posting about "tuning" but I don't know if that would work under this situation

    I did also remove the motor to see if it would spin free. It didn't spin free.
     
    #14 John in MS, Jun 7, 2016
  15. Geof

    Geof Volunteer Moderator
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    #15 Geof, Jun 7, 2016
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  16. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Disconnected and with no power if the motor shaft will not turn by hand then it is a bad stepper. If you mean that it would not turn when commanded by software then it could still be a bad stepper driver card.
     
    #16 mark tomlinson, Jun 8, 2016
  17. John in MS

    John in MS Active Member

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    This appears a little over my knowledge level and I am scheduling an appointment for next Monday (only time they had when I am not working) with a Robo tech to help me with this. I fear I will screw it more than it already is. Should I just spring the 14 dollars for a new motor or am I possibly just wanting to address a symptom (stepper motor stuck) when the cause could be electrical related (the drivers)?

    For the record, the first line of "Robo" help techs are worthless. If they can't send you a photo or a video they have nothing else to offer
     
    #17 John in MS, Jun 8, 2016
  18. Geof

    Geof Volunteer Moderator
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    To see if its a bad stepper motor do as mark said try to turn it powered off. If that feels ok you can switch the plugs on the board for the extruder and x axis. If it works in the x its good. If youd rather talk through this private message me and i can call you.
     
    #18 Geof, Jun 8, 2016
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  19. John in MS

    John in MS Active Member

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    Well that doesn't sound too hard. I will give that a try this evening, thanks
     
    #19 John in MS, Jun 8, 2016
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  20. John in MS

    John in MS Active Member

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    I swapped the wires of the motors and when I did the bed started hesitating as it it went back and forth:



    I was unable to get the extruder to move as I was moving it manually

    I then swapped it back and got the same results I have been getting:



    Bed working fine, stuck extruder again. Something appears to be wrong in the electronics
     
    #20 John in MS, Jun 8, 2016
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