Digital cameras (Piano Action)

[Richard Brekne]

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"Garret E. Traylor" wrote:

>  This sounds like we could keep some graduate students very
> busy....personally I don't know anything about physics or
> mathematics.  But, surely some time/motion study based from this
> improved filming technology could reveal some very interesting
> data. "INERTIA relating to Piano Action Geometry: The Qualitative and
> Quantitative analysis of Non-Rigid components."Garret

Stephen Birkett is working out something along these lines. Myself I am
not so sure we need to get all that deep into the math/physics side of
this... We do need to be aware of the affects of various weight / ratio
configurations on any given degree of action compliance, and Del is
right... that is not being taken into consideration by many now.

When Stanwood puts a set of monster hammers on an action, and drops the
ratio down to 5.0 or lower.. (I think his personal record is a 4.8
BWRatio) he doesnt worry about how much that actions felt compresses,
how stiff the keys are... how much flex there is in the shank... etc
etc. Nor does he do so for a 6.0 BWRatio with top medium hammers. He
just balances things out according to his predetermined specs dictated
by the Balance Equation.

Yet it seems clear that the net compliance of any action is going to
change for various configurations, and that definatly affects how the
action feels, how it delivers its punch to the strings, and utlimatly
how the voice of the instrument sounds.
 So... while Static Balance can provide us with exactly a static
balanced action.... it's less then << all we can easily do >> without
some method of putting this into a compliance perspective.

More or less the same kind of argumentation can be said about inertia.
Heck... seems to me that we dont really consider whats happening with
the employment of assist mechanisms conciously enough.


Cheers
RicB


Delwin D Fandrich wrote:

    >        The bending spaghetti is the hammer shank with
    >       the hammer trying to hold on. And then there is
    >       even more maccaroni if you start with the flexing
    >       key. At the time between when the key is hit and
    >       the time the hammer finally hits the string I have
    >       already eaten part of the salad.
    >
    >  Hans Sander
    >
    >  And yet we insist on discussing action geometry as if the
    >  various components were all infinitely rigid and had zero
    >  inertia.
    >
    >  Del
    >

     Its a good baseline... but I agree... not much good in the end
     left to itself.

     RicB

--
Richard Brekne
RPT, N.P.T.F.
UiB, Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html
http://www.hf.uib.no/grieg/personer/cv_RB.html


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