Soundboardcrown

[Peter Kestens]

Marcel,

That's the answer I am looking for.
Thanks very much.

Peter

> -----Oorspronkelijk bericht-----
> Van: pianotech-bounces@ptg.org 
> [mailto:pianotech-bounces@ptg.org] Namens Marcel Carey
> Verzonden: dinsdag 17 december 2002 14:31
> Aan: Pianotech
> Onderwerp: RE: Soundboardcrown
> 
> 
> Peter,
> 
> Here are my results and procedure:
> 
> I started with ribs that were crowned to a radius of 65 feet. 
> Made cauls that had a average radius of 47 ft Dried the 
> soundboard to a 4.48 % MC (Moisture content) When I took the 
> board out of the press, I had a crown of 45 feet radius; now, 
> after a week I have 3/8" between the longest ribs (45.5") 
> which gives me a radius of 57.5 feet. I'm quite happy with 
> this crown (Mason & Hamlin "A").
> 
> Maybe Del will have a different opinion, and I hope he will 
> share his thoughts on these figures.
> 
> Marcel Carey, RPT
> Sherbrooke, QC
> 
> > As you can think already, the press is not curved, but if I 
> decide to
> > curve it, what's the amount you suggest?
> > >
> > > Typically, if you are going to depend on just the curve of the 
> > > rib-to-soundboard press to form your crown you would want 
> to end up 
> > > with a whole lot more than 3/8" crown (on the longest 
> ribs) when it 
> > > comes out of the press.
> >
> > Does this also means that one looses a certain amount of 
> crown a few 
> > days, weeks after the board came out the press?
> > >
> > > This is why very few, if any, shops attempt to crown 
> soundboards in 
> > > this manner.
> > >
> > > Del
> > >
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> > >
> > >
> >
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> 
> 
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