No downbearing ?

[Isaac sur Noos]

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I should say that indeed downbearing is not indispensable, but on most
pianos, front bearing particularly produce a more pleasing (fuller) tone.

Bearing being not discernable after the strings have been installed, it is
often confused with "distance bearing" which indeed is the proof that some
pressure exist when it is seen, but on some pianos the soundboard look flat
after the strings have been tense (while down bearing exist absorbed by the
soundboard) .

All depend of the kind of ribbing and construction used (flat ribbing vs.
crowned ribbing). Most German made pianos are using flat ribs and are very
sensitive to humidity changes when the soundboard is in good condition, so
the go out of tune easily in that case. these instruments need less down
bearing than the ones which are using crowned ribbing (Bösendorfer for
instance).
The flat ribbing method "is said" to produce stiffer soundboard assembly,
while curved ribs need to be pressured more to obtain the necessary
stiffness. That is what I have understood, very crudely  I confess, from the
different conversations on those matters.

Bonne Année !

Isaac


                       Pianotech

                        Isaac OLEG
                        accordeur - reparateur - concert  19 rue Jules Ferry
                        94400 VITRY sur SEINE
                        oleg-i@noos.fr  tel:
                              fax:
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                              33 01 47 18 06 90
                              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 Jean-Jacques Granas
  Envoyé : mercredi 31 décembre 2003 16:10
  À : pianotech@ptg.org
  Objet : No downbearing ?


  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







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