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Noise in backlash nut

Discussion in 'CNC Mills/Routers' started by A.J.W.E. Klappe, Mar 24, 2019.

  1. A.J.W.E. Klappe

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    Hello everyone,

    I hope to meet an expert by experience who can help me solve the following problem.
    In 2018 I built an Openbuilds OX of 1000 by 1500 mm. This was originally belt driven. After trying out countless pieces of work, I found out that the belt on the x axis started to wear and therefore skipped steps. I have therefore purchased a complete lead screw unit and successfully assembled it. After everything was reconnected, I obviously tried the machine and that went fine too. Then I tried a workpiece without the mounted router and it went wrong there.
    When moving the machine with the buttons in high speed everything goes fine and everything runs smoothly, but when a workpiece has to be turned, a kind of whistling sound comes from the backlash utility. This afternoon I unscrewed the shaft again and mounted it again in such a way that it runs very smoothly through the backlash utility. Everything installed again but still the same problem. I suspect that it is because a much lower speed is used when milling the workpiece than when I am jogging in the open field. If there is someone who has experienced this or has a solution, please let me know.
    Thanks in advance
    bert
     
  2. Gary Caruso

    Gary Caruso OpenBuilds Team
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  3. Chillimonster

    Chillimonster Veteran
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    I use WD40 Dry Lube (PTFE) on my screws, backlash nuts and any other moving part. - Was recommended on a thread on here
     
  4. A.J.W.E. Klappe

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    Thanks. I al ready used grease but that did not help.
     
  5. A.J.W.E. Klappe

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    I'll try this tomorrow Thanks
     
  6. Colin Mccourt

    Colin Mccourt Master
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    Dry Silicone PTFE enhanced spray..stops debris sticking to the parts

    Lube sml.jpg
     
    #6 Colin Mccourt, Mar 24, 2019
    Last edited: Mar 24, 2019
  7. Alex Chambers

    Alex Chambers Openbuilds Team
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    Also, check you haven't overtensioned your anti backlash nuts. On a new setup there will be virtually no backlash. You didn't say where you got your leadscrew from, so I don't know what sort of anti backlash setup you have. With the openbuilds plastic anti backlash nuts they only need to be gently squeezed together before tightening them to the gantry plate.
    Alex.
     
    Colin Mccourt likes this.
  8. Gary Caruso

    Gary Caruso OpenBuilds Team
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    Are you sure its the nut? the motors can hit a resonance at some slower speeds which can be rather loud. A short video posted here can help.
    Cheers
    Gary
     
  9. A.J.W.E. Klappe

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    I will try this today. Thanks
     
  10. A.J.W.E. Klappe

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    I will try to do this this evening, but my back is killing me today so I don't know if can make it. Thanks
     
  11. A.J.W.E. Klappe

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    Hi, Last Saturday I unscrewed the entire lead crew and screwed it in again and then he ran very smoothly. I will first try it with WD 40 whether it has an effect. The difference between jogging and running the program with the sound I find so strange. Thanks for your reply. I hope to make a video today so that everyone can listen.
     
  12. GrayUK

    GrayUK Openbuilds Team Elder
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  13. A.J.W.E. Klappe

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  14. A.J.W.E. Klappe

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    This one makes a different noise then mine.
     
  15. A.J.W.E. Klappe

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    Hi guys, I made two videos of my machine tonight. As you can see, I have made a few adjustments to my machine. I have raised the X axis, extended the Z axis and finally applied a lead screw to the X axis. It is this last adjustment that worries me. As you can hear in the video, the X axis makes a loud noise when making a program. I hope this video contributed to finding the problem. I have not used WD 40 yet.
     

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  16. A.J.W.E. Klappe

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    And the second video
     
  17. Rob Taylor

    Rob Taylor Master
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    The only noise I hear in the video is the stepper motor vibrations being amplified by the aluminum structure. Nothing to do with the screw, that's hissing through the Delrin nut just nicely. These machines are noisy! If you want quiet, you'll have to look into servos, but be prepared to spend 5-10x the price!
     
  18. A.J.W.E. Klappe

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    Thanks for your reply. Maybe i first use WD 40 and see what effect that has.
     

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  19. Rob Taylor

    Rob Taylor Master
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    WD-40 is not a lubricant! Initially it displaces water (hence WD- Water Displacement) and then once it dries on the surface, it actually attracts moisture.

    Go with a dry- PTFE or graphite- lube, or a light 3-in-1/sewing machine type oil.
     
  20. A.J.W.E. Klappe

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    Thanks Rob for this info.
     
  21. Alex Chambers

    Alex Chambers Openbuilds Team
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    Your second video sounds just fine (the same as my leadscrew machine), but you might want to do something to fix the moving end of the X axis drag chain - you are flexing and stressing the wires coming out of it at the moment - the wires are supporting the drag chain rather than the other way round.
    Alex.
     
  22. A.J.W.E. Klappe

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    Hello Alex, thank you for your response. I was not completely done with the assembly. Of course I wanted to test if everything was ok after I installed the lead screw and I ran into this problem. Right now I'm home, my back is killing me. I don't have the ability to test and change the machine now. I hope that I can work quickly on the machine again through medication.
    Bert
     

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