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  1. #1
    Member RufusToad's Avatar
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    Default Jumpy X Axis

    I was wondering if anyone has experienced a jumpy axis on a router table that was caused by the Motor Tuning in Mach.
    Could a miss tuned motor somehow cause a slight jumping effect that is more pronounced with faster speeds?
    I am pretty sure there is nothing with the gears or Nema 34 motor. It just seems as if there is a possible internal fight happening, but I could be crazy as well.
    I am not losing steps nor is there any kind of noise, but you can see the table shake slightly.
    The noticeable shake is at a speed of say around 120ipm but if you slow down to around 60-80ipm it is a lot smoother.

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  2. #2
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    Default Re: Jumpy X Axis

    Hi,
    if its not losing steps, it sounds like it close to doing so. I would guess its a mid-band resonance. 34 size steppers seem to be prone to this kind of vibration.

    What micostepping regime are you using?

    Craig



  3. #3
    Member RufusToad's Avatar
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    Default Re: Jumpy X Axis

    Hi Craig,
    I figured somebody might have some great info on this forum. It is very odd, but I did notice something tonight as I was changing tools, I use my remote pendant or arrow keys and it is moving as smooth as a baby bottom.
    I will also say I am noticing this more on 3d/STL type carvings like a waving flag type carve. I took a screen shot of the motor steps. Y is very similar but doesn't seem to be jumping.
    Do you think I am off on the steps or maybe the velocity is to high?
    Im using surestep motors and Automation drives.

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    Default Re: Jumpy X Axis

    Cost you nothing to slow down both speed and acceleration a bit for a test run.
    Cheers
    Roger



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