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Lead Screw Nut Block Noise

Discussion in 'CNC Mills/Routers' started by Tektonic, Mar 25, 2019.

  1. Tektonic

    Tektonic New
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    Hi,

    New to the forum but not new to openbuilds. I am getting a lot of noise, specifically a whizzing sound coming from the z axis assembly. I assume it is happening between the lead screw and nut block. I purchased this kit from SMW3D back in the day and am now just putting it together (got caught up in life so this project was put on hold for years...) so all the parts are stock original seller components.

    I tried putting some gun oil (didn't have any WD40) in between the nut block and lead screw and it's made no difference. Is this suppose to happen? Is there a solution to this issue? The lead screw did feel a bit tight when screwed into the nut block. The kit and all components are new and never been used before.

    I am running the ox off a tinyg controller.

    Enclosed is a video showing what I mean.

     
    #1 Tektonic, Mar 25, 2019
    Last edited: Mar 25, 2019
  2. GrayUK

    GrayUK Openbuilds Team Elder
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    It sounds like vibration to me.
    Are those bearings seated properly?
    I would try removing the plate from the nut block to see what noise I get.
    You could then hold the nut block and feel if it is the problem.
    Then take the nut off completely to see what you get.
     
  3. Rob Taylor

    Rob Taylor Master
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    That's the sound of an improperly wired stepper. It's losing a phase, maybe a bad connector or solder joint. At least that's the only time I've ever heard that grinding noise!
     
  4. Tektonic

    Tektonic New
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    It's not the nut block or vibration as I've completely disassembled that Z assembly and I still keep getting that grinding noise as I keep removing components. I think there is something wrong with the motor, I've attached a video and the motor itself has a grinding noise.

    Like Rob said, maybe a bad connector....


     
  5. Tektonic

    Tektonic New
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    I think there is something wrong with the stepper motor itself. I checked for continuity on the electrical connectors between the tinyg board and the stepper itself, no issue there.

    Here's a comparison video comparing the stepper in question to another stepper that is fine.

     
  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

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    TI drivers on the TinyG? Google "DRV8825 Noisy" - those drivers have their chopper frequency in the audible range, at certain current settings the Chopper works overtime and becomes "audible" as it pulses current to the stepper windings. Dial back the current potentiometer a little on that axis and it will quiet out. Or replace the drivers with DQ542MAs, BlackBox or Trinamics
    You can swop motors around between axes and you'll see the other motor, on that axis will sound the same till you adjust the current :)

    of course you actually want the current, so learn to love the noise instead. The quiet axes might be under powered why you dont hear them
     
  7. Tektonic

    Tektonic New
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    I tried dialing back the current potentiometer but I still get the grinding and vibrations from the stepper motor itself, it's just a little less noticeable but it's still there. On the bigger steppers, there is none of the grinding or vibrations. I also tried swapping motors around and shuffling them on to different axis as well and it is just the small NEMA17 that makes the grinding noise and vibrations. Maybe you are right in that the NEMA17 is operating at a higher current while the other 3 larger steppers are under powered.

    The whole z axis assembly works in a sense but with the grinding and vibrations, I don't know if that will affect the accuracy of the machine. I am hesitant to continue to assemble the entire machine only to find out later there are accuracy issues caused by this vibration/grinding issue.

    At this point, I would prefer to see if I can get this thing to work without buying a new driver as I already have the Tinyg board and from watching other videos, others seem to be able to get it working smoothly without any modifications.
     
  8. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    The Nema23s are 2.8-3A depending on whether its our regular or high torque motors. Our Nema17s are 1.7A, so considering the difference, adjust current accordingly.

    QUOTE="Tektonic, post: 79582, member: 132688"]I tried dialing back the current potentiometer but I still get the grinding and vibrations from the stepper motor itself, it's just a little less noticeable but it's still there. On the bigger steppers, there is none of the grinding or vibrations. I also tried swapping motors around and shuffling them on to different axis as well and it is just the small NEMA17 that makes the grinding noise and vibrations. Maybe you are right in that the NEMA17 is operating at a higher current while the other 3 larger steppers are under powered.

    The whole z axis assembly works in a sense but with the grinding and vibrations, I don't know if that will affect the accuracy of the machine. I am hesitant to continue to assemble the entire machine only to find out later there are accuracy issues caused by this vibration/grinding issue.

    At this point, I would prefer to see if I can get this thing to work without buying a new driver as I already have the Tinyg board and from watching other videos, others seem to be able to get it working smoothly without any modifications.[/QUOTE]
    he
     

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