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IndustryArena Forum > WoodWorking Machines > DIY CNC Router Table Machines > CNC Router Parts > CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise
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  1. #1
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    CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    I am finishing up a 4'x4' 80/20 extrusion custom build. I purchased Avid CNC's Pro 12" Ballscrew Z axis. While in the process of making sure everything works as it should, and adjusting my limit switches, I noticed a clicking noise when moving Z up and down. When I move it up, I get one click. If I move it up again, no click. If I then move it down, I get one click. If I move it further down, no click. So, I get one click with every change in direction. There is no correlation along the travel distance. It clicks no matter where.

    I've checked all the couplings. Everything's tight. Before I mounted my NEMA 34 stepper, I manually moved the axis up and down. Everything seemed smooth. I haven't yet measured Z for backlash yet. That's coming up on my to do list in the next couple of days. I'm guessing the click will correlate to some degree of backlash. Oh, and the axis came greased, so that's not an issue.

    For those of you with the Pro Ballscrew Z axis, is this click normal? If it is, do you know what's causing it?

    Before you make the suggestion, yes, I sent an email to Avid about it late afternoon on Thursday. I thought I might get a reply yesterday, but no such luck. I'll probably receive a reply Monday or Tuesday. I'm posting here so I can possibly get a head start on things. I'm reluctant to move forward, until I get a handle on what's going on.

    Thank you in advance,

    Gary

  2. #2
    Community Moderator ger21's Avatar
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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Have you greased it? It may just be the balls moving in the nut.
    Gerry

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  3. #3
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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    I am having a similar problem with my 12" Z-Axis. When it was new, it had clicks only every once in a while. Now, the clicking is very frequent. It makes multiple clicks on either up or down. Greasing the screw and linear bearings made no improvement.

    I found a problem with the upper bearing on the ball screw shaft. It was able to slide up and down inside the housing by several thousandths. Due to the radius of the outer edge of the bearing and the radius of the underside of the screw heads, the bearing had slop in it, and was able to slide up and down. Adding a flat washer under the three screws fixed the backlash problem. However, the clicking noise remains.

    I also notice the round cylinder above the bottom bearing wobbles when the shaft rotates. I haven't figured out what its purpose is. I don't think that is where the clicking noise is coming from. It sounds like the noise comes from the ball screw nut.

    I was considering contacting AVID CNC soon. I am getting concerned that it may have a failure. I am hoping that it is just noisy.

    David

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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Quote Originally Posted by ger21 View Post
    Have you greased it? It may just be the balls moving in the nut.
    It came greased. There was red grease on the ball screw and some grease squeeze out at the ends of the bearing blocks on the linear rails.

    I looked at the Avid build instructions for their Pro Machines. Interestingly, there are no instructions for greasing anything on the Z axis. I haven't looked closely at the ball screw nut to see if there is a place to grease directly into the nut. I'm not home now; I'll check when I get home tomorrow. If the nut is filled with grease, I wouldn't think there would be clicking. If grease was applied to just the screw, maybe that would account for the clicking.

    It occurred to me that it could be balls moving in the nut, but having no experience with ball nuts/ball screws, I didn't know whether such a thing could occur. I guess it can.

    Thanks for weighing in.

    Gary

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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Quote Originally Posted by dws View Post
    I am having a similar problem with my 12" Z-Axis. When it was new, it had clicks only every once in a while. Now, the clicking is very frequent. It makes multiple clicks on either up or down. Greasing the screw and linear bearings made no improvement.

    I found a problem with the upper bearing on the ball screw shaft. It was able to slide up and down inside the housing by several thousandths. Due to the radius of the outer edge of the bearing and the radius of the underside of the screw heads, the bearing had slop in it, and was able to slide up and down. Adding a flat washer under the three screws fixed the backlash problem. However, the clicking noise remains.

    I also notice the round cylinder above the bottom bearing wobbles when the shaft rotates. I haven't figured out what its purpose is. I don't think that is where the clicking noise is coming from. It sounds like the noise comes from the ball screw nut.

    I was considering contacting AVID CNC soon. I am getting concerned that it may have a failure. I am hoping that it is just noisy.

    David

    Thank you, David. I'll check on the things you pointed out as issues. I sure hope I don't have issues with slop/blacklash. I sure don't want to remove the axis and dismantle it.

    See Gerry's (ger21) comments above. Maybe it's the ball movement in the ball nut. I have had difficulty isolating the sound, but I cannot rule out the ball nut.

    Like you, I was "hoping that is just noisy."

    Hopefully, some other Avid CNC Pro Series owners will stop by and let us know about their experiences. In any event, I report on what I hear from Avid so you will know what I learn.

    Gary

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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Gary,

    AVID CNC recently posted some YouTube videos on greasing: https://www.youtube.com/channel/UCUU...I66UPUohD-Dkeg I didn't see any mention of greasing the nut; only the screw and linear bearings.

    With the backlash, I was only having issues with drilling holes. Otherwise the weight of the spindle, keeps the Z-Axis in the down position. I was able to lift the spindle by hand to notice the slop in the upper bearing. You only have to remove the dust covers to get access to the upper bearing/screws. If there is a problem with the ball nut or the lower cylinder piece, then I would also regret having to disassemble the whole Z-Axis.

    David

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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Quote Originally Posted by dws View Post
    I am having a similar problem with my 12" Z-Axis. When it was new, it had clicks only every once in a while. Now, the clicking is very frequent. It makes multiple clicks on either up or down. Greasing the screw and linear bearings made no improvement.

    David
    Check that these grub screws are tight and that the ballscrew ends are firmly located. Mine were loose and they do come loose without loctite.

    Attached Thumbnails Attached Thumbnails Screen Shot 2019-06-30 at 10.33.29 am.jpg  

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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Quote Originally Posted by andrewwong2000 View Post
    Check that these grub screws are tight and that the ballscrew ends are firmly located. Mine were loose and they do come loose without loctite.
    I just rechecked the screws in the collar (shown in green in your picture). They are still tight. However, the gray colored sleeve just below the green collar shown in your picture is loose. It won't rotate; however, when I run the Z-Axis up and down, it wobbles even when I hold onto it. The ball screw ends seem to be stable. Do you have any idea what is wrong with my Z-Axis?

  9. #9
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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Quote Originally Posted by andrewwong2000 View Post
    Check that these grub screws are tight and that the ballscrew ends are firmly located. Mine were loose and they do come loose without loctite.


    Thank you, Andrew. I checked all the fasteners and all are tight, except one that was missing. At the top end, there is a part on the ballscrew that is circular, but with 2 flats on opposing sides. It is directly below the Oldham coupler. On the curved surfaces, there are two threaded holes on opposite sides. One had a set/grub screw in it and it was tight. On the opposing side, no screw. I didn't know whether that was intentional, or someone forgot to put in the 2nd screw.

    I'll have to go back and check the grub screw you referenced. I don't recall seeing one there.

    Gary

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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    The green coloured sleeve with the grub screws in it holds the Oldham collar down.. so if the grub screws are tight but the collar is too high from the bottom, then the Oldham collar will wobble loose and rattle/click. I had lightly push the Oldham collar and sleeve down so that it sits snugly and then tighten up the grub screws again.

    If your grub screws are tight and the collar won't shift, but the Oldham collar can move vertically.. then re-adjust.

    This was my problem but may not be yours.

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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Thanks Andrew. I think that re-adjusting the collar as you suggested fixed the problem. It is much quieter now.

    David

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    Re: CNCRP/Avid CNC Pro Ballscrew Z Axis (12") Making Clicking Noise

    Quote Originally Posted by andrewwong2000 View Post
    The green coloured sleeve with the grub screws in it holds the Oldham collar down.. so if the grub screws are tight but the collar is too high from the bottom, then the Oldham collar will wobble loose and rattle/click. I had lightly push the Oldham collar and sleeve down so that it sits snugly and then tighten up the grub screws again.

    If your grub screws are tight and the collar won't shift, but the Oldham collar can move vertically.. then re-adjust.

    This was my problem but may not be yours.
    Quote Originally Posted by dws View Post
    Thanks Andrew. I think that re-adjusting the collar as you suggested fixed the problem. It is much quieter now.

    David

    Thanks, guys. Sounds promising.

    Gary

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