Soundboard stiffening-thanks Ron-N ( Here's that response I promised. )

[gordon stelter]

Ron, 
    Your "response" as it were, avoided answering the
basic question that I posed: that a board constrained
by the rim glue joint will have the forces you
observed re-directed outwardly.
    And you indulged in insult and rudeness to a post
which I very diligently tried to make as polite and
objective as possible, for the mutual benefit of all
readers.
    These two aspects of your "response" can only
detract from your credibility.
     I have no doubt that if I replicated the
experiment you created, I would observe the same
effect. But your setup does not mirror a board
installed in a rim, where other factors come in to
play. Right???
     Please abandon the invective and address the
actual question at hand. 
     Thank You,
     Thump

--- Ron Nossaman <RNossaman@cox.net> wrote:
> 
> >Dear Mr.Nossaman,
> >      I thank you for attempting to empirically
> >demonstrate the effect of downbearing, on a
> "mock-up"
> >of a soundboard panel and rib. And I thank you for
> >your very polite description, which has added to my
> >understanding of the forces involved.
> >      Still, I remain skeptical of your
> explanation.
> >      You claim to have seen the board ends come
> INWARD
> >as pressure is applied to the crown's apex---- and
> I
> >would never call an eyewitness a liar!
> 
> Yet you in effect are, and have - twice.
> 
> 
> >  But I am sure
> >that you realize this contradicts common perception
> >and observation, to say nothing of the laws of
> >physics.
> 
> I realize no such thing. Gordon, have you actually
> tried it, or are you 
> speaking for common perception, observation, and the
> laws of physics from a 
> position of pure speculation?
> 
> 
> >Unless something else is at work here!
> 
> What is at work here is what Phil Ford and I
> discussed, that soundboard 
> crown is not an arch in the first place in spite of
> someone's intuitive 
> impression that it must be so. Refer to our
> discussion for the details.
> 
> 
> >      The only (legal) way to end this debate may
> be to
> >put a very large micrometer across a piano rim and
> >load the board, watching for expansion. ( Or
> >contraction, as your prior assertions would seem to
> >indicate.)
> >      Your response will be most sincerely
> appreciated.
> >
> >      Thank You!
> >      Thump
> 
> Build the rib and panel model, do the test, and pay
> attention.
> 
> Ron N
> > _______________________________________________
> pianotech list info:
> https://www.moypiano.com/resources/#archives
> 


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