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buzzing / vibration on y-axis

Discussion in 'General Talk' started by gazingm42, Mar 5, 2017.

  1. gazingm42

    gazingm42 Journeyman
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    On the final path to finishing this project....

    So I have a 1000mm x 1000mm cnc. Which the Y - axis has 2 motors at the rear turning each a 8mm lead
    screw in a c-beam. With a over head x-axis with single stepper with 1000mm 8mm lead screw.

    When the y-axis moves +/- it makes a loud buzzing or vibration. I tried to figure out the location but seems
    to have no area I can pin point it. It appears to be a vibration sound.. I can press on any of the y-axis or cross members I see feel the vibration. I can not seem to figure it out, but thinking it just normal noise made from the
    steppers moving the lead screws.

    I have watched and measured many times the movement of both sides of the y-axis of the x-axis to make sure
    there no binding etc.

    Also x-axis makes a similar noise but not close to the volume.

    Any ideas?
     
  2. Mark Carew

    Mark Carew OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

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    It sounds to me that you may have the wiring wrong. Especially since your using 2 motors on the same axis one has the be wired in revers so it can be easy to mix these up.I would suggest that you double check these motor wires. (make sure to power down first)
     
  3. gazingm42

    gazingm42 Journeyman
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    Mark,

    Thanks for the reply. Wiring seems to be ok. As the Y-Axis is moving just making the buzzing/vibration in the
    aluminum rails. I did loosen both couplings so the lead screws would not move. There no noise from the motors and turn fine.

    It appears there a vibrations resonating in the aluminum rails.
     
  4. Jonathon Duerig

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    @gazingm42 Put your hands on the motors themselves. Even if they do not seem to be making a lot of noise themselves, does it decrease the overall noise level?

    For my current setup, the Y-axis movement is also the loudest thing. This is caused by two things. One is that I've got my pots on the motors turned a bit on the high side so that the motors themselves transmit vibration into the frame. And two is that I have a fair amount of loose hardware on the frame. Mostly T-nuts that are captured in some of the runs that I added as 'just in case' hardware to make mounting stuff on easier. The machine became noticeably quieter when I used extra set screws from a makerlink order to fix most of those floating t-nuts into place.
     
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  5. gazingm42

    gazingm42 Journeyman
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    @Jonathon Duerig, Thank you so much for the suggestion on the motors pots. Mine were set to the default as recommended by tinyg wiki between the 8 & 4 position. By turning them down just a little the noise disappeared by 85%. Now the family is not going kick me to the garage, until the router is installed and starts
    cutting tonight or tomorrow :)

    Thanks again for everyone's help.
     
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