soundboardinstal again

[Isaac sur Noos]

Info from the Bosendorfer factory : , rib crowned, glued in counter
crowned press under 6 % wood MC

Greetings

Isaac OLEG

Entretien et reparation de pianos.

PianoTech
17 rue de Choisy
94400 VITRY sur SEINE
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
cell: 06 60 42 58 77

> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Ron Nossaman
> Envoye : mercredi 30 juillet 2003 08:25
> A : davidlovepianos@earthlink.net; Pianotech
> Objet : RE: soundboardinstal again
>
>
>
> >In a rib crowned system, then, how important is it to
> control the moisture
> >content in the board during installation.  It sounds as if
> it is not so
> >critical.
> >
> >David Love
>
> It's not as critical structurally, since the ribs are doing
> the structural
> support work they're designed for, but you still need to
> assemble them
> within a certain MC range so the panel doesn't make the
> assembly overly
> stiff (temporarily) by excess expansion, nor crack when it
> dries out in the
> winter months. The MC range for rib crowning tends to me in
> the 6%- 6.5% MC
> range, rather than the 4% - 4.5% range for compression crowning.
>
> Ron N
>
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