High ratios/high SW's and assist springs: was Re: Fw: PatentNotice

[Isaac OLEG]

Bill's write :

But while we can  combine the
> idiosyncrasies of the pianist with the much more straight-forward
> mechanical proposition of the action, it's best to keep in
> mind that  the only thing which the action receives from the pianist
is hammer  velocity

It is a little too simple proposal me guess, the piano is a percussive
instrument so all the noises and percussive tones are parts of the
piano tone and feel.
Depending of the weight of the pianist the way the strings are build
in vibration and the percussive tones will vary. Depending of the
stiffness of the punching, the flexibility or inertia of the action
keyframe and stack, the tone produced will vary.

While I understand we may find methods to evaluate the acceleration of
the masses and if they are well matched, by the method of leverage,
weights, angular motion or whatever is useful, at the end we always
need to attain an ensemble of parameters that lend to a good tone, a
predictable touch and a fast repetition.

As for tuning, a good protocol will put us on the way of the "magical
regulation" (while it is far more technical than tuning).

Well again out of the subject, sorry.

Regards.

Isaac OLEG



> >And besides... there something not quite right about the
> idea that any given
> >product of (m*v) regardless of the porportions of m and v
> result in
> >the same net
> >effect on strings in the collision between the two.
>
> Once again, we have to distinguish between before-strike and
> after-strike. After strike, the velocity is rapidly
> vanishing (as its
> displacement of the string meets increasing resistance) and the
> enduring value is the hammers mass. I agree that upon
> collision, any
> extra inertia inherent in a higher SW will help in
> achieving maximum
> displacement in the struck string. Until that collision, all the
> hammer has is momentum (m*v).
>
> Until strike, equivalent momentums may be had by juggling the
> proportions of the two factors. Upon strike, the particular
> value for
> SW has everything to do with how that momentum is translated into
> strings displacement.
>
> Time for a 'mater/mayo sammidge. (or two...)
>
> Bill Ballard RPT
> NH Chapter, P.T.G.
>
> "I go, two plus like, three is pretty much totally five. Whatever"
>      ...........The new math
> +++++++++++++++++++++
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
>