Two rebuilding questions

[Gregor _]

very interesting. I never heard of such a design. No idea what the original 
idea was, but I argue that design could produce *clattering* sounds. I am 
not shure if I figure out that correctly: are you talking about wood on wood 
without glue or any other intermediate layer?

Gregor


>From: Richard Brekne <ricb at pianostemmer.no>
>Reply-To: Pianotech List <pianotech at ptg.org>
>To: pianotech at ptg.org
>Subject: Two rebuilding questions
>Date: Fri, 15 Jun 2007 08:31:03 +0100
>
>Hi
>
>I have a couple questions about older pianos vs new.  In many (grands)
>pianos of the 1800's you see the bent side of the soundboard left
>unglued. Often enough half of the tail section is also unglued and the
>other half floating... with or without an additional mass added at that
>point.
>
>My questions...
>
>first :  What difference would gluing the these sections make to the
><<vibrational-ability>> of the soundboard assuming the mouldings that
>are nailed down hold it just as strongly coupled (at least vertically)
>to the rim ?  Presumably the unglued idea was to allow the panel to
>expand sideways with climate changes .... perhaps this was an idea to
>increase tuning stability ????
>
>Second.. this mass addition at the tail.  I've seen various modern
>schemes pictured on the list lately... veneers to add stiffness at the
>tail... etc.  What is the perceived advantage of taking half the tail
>section and floating it with an extra thick piece of wood glued to the
>both sides of the panel. ? (I've only seen this done on the tail half
>adjacent the bent side corner)
>
>Any thoughts on the matter are very much appreciated.
>
>Cheers
>RicB
>
>
>
>

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