No downbearing ?

[Isaac sur Noos]

The geometry of the bearing force certainly influence tone, (front
bearing vs/back bearing) Many rebuilders lower the plate almost
systematically when not enough bearing (sunken board) and the
resulting tone is never really agreable nor full and long.

Is more pressure at the back of the bridge stiffening more this side
of the board, while the larger part of the board is still too flexible
?

Or because of the S shape the board is always taking then, there is a
zone where the soundboard is so mushy it adbsorb too much of the
strings energy ?




------------------------------------
Isaac OLEG
accordeur - reparateur - concert
oleg-i@noos.fr
19 rue Jules Ferry
94400 VITRY sur SEINE
tel: 033 01 47 18 06 98
fax: 33 01 47 18 06 90
mobile: 033 06 60 42 58 77
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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de John Hartman
> Envoye : mercredi 31 decembre 2003 16:49
> A : Pianotech
> Objet : Re: No downbearing ?
>
>
> Jean-Jacques Granas wrote:
> > Hello y'all and tout le monde,
> >
> > I have come across a puzzling suggestion a few weeks ago:
> Namely, that
> > downbearing is not really necessary in order to transfer
> the vibration
> > of the string to the soundboard panel, the mere "grip"
> that the string
> > has on the bridge being sufficient to assure this
> transfer. Would anyone
> > of you with experience in such issues care to comment?
> >
> > Happy New Year everybody
> > Wishing you all wonderful crowns, tight pins, and
> fautless repetition,
> >
> > Jean-Jacques Granas
> >
> >
> >
> >
> >
> >
> >
>
> Jean-Jacques,
>
> Yes I believe this is correct. Bearing does not directly
> influence the
> transfer of vibrations. What it does is alter the apparent
> stiffness of
> the Soundboard and thereby help to control the rate at which the
> vibrations move from the strings into soundboard. Check the
> archives for
> soundbaord impedance.
>
>
> John Hartman RPT
>
> John Hartman Pianos
[link redacted at request of site owner - Jul 25, 2015]
> Rebuilding Steinway and Mason & Hamlin
> Grand Pianos Since 1979
>
> Piano Technicians Journal
> Journal Illustrator/Contributing Editor
[link redacted at request of site owner - Jul 25, 2015]
>
>
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