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  • #16
    Originally posted by Helmholtz View Post
    Unfortunately I don't have access to professional acoustics lab equipment like a laser doppler interferometer. I am mainly referring to the results of acoustics professor Helmut Fleischer et al. A few examples:

    https://www.guitarmasterclass.net/gu...=post&id=44678
    https://acoustics.org/pressroom/http...fleischer.html
    https://www.researchgate.net/publica...ral_vibrations
    https://www.researchgate.net/publica...ectric_Guitars
    https://www.researchgate.net/publica...c_guitar_tones
    (https://www.thegearpage.net/board/in...2093947/page-2)

    I have more of Fleischer's publications but only on paper and in German.

    As the trussrod won't be able to vibrate freely and develop its Eigen-frequencies, I think it mainly adds weight to the neck.
    The measured resonant frequencies were in good agreement with the calculated resonances of a wooden beam.
    I am not aware of any papers that analyze the influence of the trussrod.
    All MEF members building guitar or bass necks might have more input.

    I did a thought experiment to share with MEF members to see if this conclusion (below) may be plausible.

    I researched the web and found this:https://www.premierguitar.com/articles/case-of-the-noisy-truss-rod-1


    Vibrating truss rods are highly variable due to many things like neck design, truss rod tension and curved insert length pressure against the truss rod. If only the center of the truss rod were against the curved insert then the two ends of the truss rod may not be damped and then begin to vibrate in sympathy with certain guitar notes. As the truss rod tension changes, these sympathy note will change slightly making detecting it even more elusive.

    Solution! What if when a truss rod is installed and the curved insert had a rubber type damper on each end of the center contact point that would surpass any sympathetic vibrations on the rod ends?

    Anyone have any thoughts if this might work?

    Joseph J. Rogowski
    Last edited by bbsailor; 04-12-2020, 07:47 PM.

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    • #17
      Originally posted by bbsailor View Post
      Solution! What if when a truss rod is installed and the curved insert had a rubber type damper on each end of the center contact point that would surpass any sympathetic vibrations on the rod ends?

      Anyone have any thoughts if this might work?
      Don't know, but I can say from experience that this sometimes works:
      http://www.frets.com/FretsPages/Luth.../trussrod.html

      -rb

      EDIT: I replied before reading your linked article. I see that my reference is a variation of the same technique.
      DON'T FEED THE TROLLS!

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