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Solved polulu DRV8825

Discussion in 'General Questions' started by janot928, Oct 22, 2015.

  1. janot928

    janot928 Active Member

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    Just wanted to know if they would work with the robo without to much modifications
     
    #1 janot928, Oct 22, 2015
  2. Mike Kelly

    Mike Kelly Volunteer

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    They have 1/32 stepping so you'd need to modify your firmware.
     
    #2 Mike Kelly, Oct 22, 2015
    Last edited: Oct 22, 2015
  3. janot928

    janot928 Active Member

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    what kind of modif?
     
    #3 janot928, Oct 22, 2015
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    #4 mark tomlinson, Oct 22, 2015
  5. janot928

    janot928 Active Member

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    ok thanks. just wanted to know because it would allow for lower running noise. Can anyone confirm ?

    I might try to go for those one
    http://www.watterott.com/en/SilentStepStick
    a bit on the expensive side but hey if it means that the printer can run silently i'll take it
     
    #5 janot928, Oct 23, 2015
    Last edited: Oct 23, 2015
  6. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Most of the noise you hear from the Robo is not from the steppers. It is a combination of cheap chinese fans, and the bearings running along the rails. The stepper noise is only some additional on top of those two biggest contributors. If you want quiet, then first replace all the fans with low noise equivalents. Then get yourself some IGUS bearings and replace all the LM8UU (all 12) linear bearings. Those two things will leave you with a printer much quieter by many decibels.

    All those options require no messing with firmware, no compiling, no uploading. Just changing the stepper drivers will be insignificant with regard to noise.
     
    #6 WheresWaldo, Oct 23, 2015
    Last edited: Oct 23, 2015
  7. bamhm182

    bamhm182 Active Member

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    I replaced my stepper drivers with DRV8825s and I heard no noise difference. As Waldo said, the fans are what's causing a very large majority of the sound. It seems like the fan on the hot end heat sink is the biggest culprit of them all. As Mike & Mark said, you'll have to change the esteps on each of the motors you swap the stepper drivers on to double their standard value.
     
    #7 bamhm182, Oct 23, 2015
  8. janot928

    janot928 Active Member

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    that's also on the list (noctua fans are amazing ^^') and i might have found an excelent lm8uu replacement :
    .
     
    #8 janot928, Oct 23, 2015
  9. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Problem with the bronze bearing/bushing is that their nominal outside diameter is usually much smaller than the LM8UU so they are not a drop in replacement. But they are quieter and will handle axial loads as well as radial loads, so they are a good choice if you can make them work.
     
    #9 WheresWaldo, Oct 23, 2015
  10. janot928

    janot928 Active Member

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    I Know about that.
    But hey I've got a 3d printer :p
     
    #10 janot928, Oct 23, 2015

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