Soundboard drydown for installation

[Farrell]

Boy, I don't really know. I should re-read Ron's article. Do you are anyone 
else know which issue it appeared in?

Please keep in mind here that I'm not really trying to argue this or that 
about any of this - I'm happy with the way I build soundboards and I don't 
worry one way or the other about the rim doing anything but sitting there 
and hopefully not significantly dampening the vibrations of my soundboard.

Terry Farrell

----- Original Message ----- 
From: "Richard Brekne" <ricb at pianostemmer.no>
To: <pianotech at ptg.org>
Sent: Saturday, January 19, 2008 12:05 PM
Subject: Soundboard drydown for installation


> Hi Terry...
>
> I'll just take this bit here as it seems like we are on the same page at 
> this point.... comment below it all
>
>
>         > If the edges are strong enough to keep the panel from
>        crowning, then it
>         > would seem to me that they are strong enough to help support
>        crown if they
>         > were first asked to..... which of course is a different
>        question all
>         > together.
>
>
>    Well, actually, that is what I thought you were asking. I agree,
>    that if one
>    believes that rim constraint causes crown, then a panel edge that
>    resisted
>    crushing would indeed be part of a crown-making system.
>
> My point is... that  Ron's experiment shows clearly the end grain of the 
> top half of the panel will not crush as advertised in some of the 
> argumentation against the buttressed arch idea. Indeed... it is strong 
> enough to <<buttress>> his experimental panel bit against crowning.  So 
> the "end grain will simply crush" argument appears clearly disproved by 
> his experiment.
>
> Whether or not the soundboard actually behaves in such a manner that this 
> same edge wood would actually exert outward pressure on the rim in the 
> face of increase down bearing ... or as Ron suggests do the exact 
> opposite... is another question entirely.  But if it actually DID exert 
> outward pressure... it seems clearly demonstrated by his own experiment 
> that the end grain would not simply crush. It would hold stand as it did 
> in his experiment.
>
> Cheers
> RicB
>
>
>