Belly rail crown - Why???

[Delwin D Fandrich]

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  ----- Original Message -----=20
  From: Erwinspiano@aol.com=20
  To: pianotech@ptg.org=20
  Sent: November 24, 2002 9:04 AM
  Subject: Re: Belly rail crown - Why???


  In a message dated 11/24/2002 12:23:50 AM Pacific Standard Time, =
pianobuilders@olynet.com writes:


                  And, that's pretty much my point. =20
   =20
   Del-=20
       My point though (lame is) that there is a cohesive stiffening =
factor when the whole things glued up to the rim though. I have no major =
investment in the idea of the spruce panel itself being glued down as =
being more than a small factor in the whole stiffness equation.=20

      I'm completely lucid about the idea of the majority of the =
stiffness coming from the ribs stiffness via materials & design but the =
whole unit is stiffer when the rib ends can't move any more being glued =
to the rim that is it not?
  =20
  And my point is that the stiffness of the wood does not change just =
because one end of it is glued to (in this case) the rim of a piano. The =
whole panel may seem stiffer to you, yes, because it is no longer a =
free-edged panel that can fairly easily be twisted. But the =
characteristics of the wood remain the same. When all is said and done, =
wood is simply an engineering material.


                Well then another perhaps faulty thought comes to mind =
and it doesn't necessarily support my previous statement.  Why not just =
adopt the Charles Fredrick Stein concept of leaving the rib ends thick =
and just glue them to the a notched liner.  Heck forget the notch and =
glue them right on top of the rim? Anyway this leaves the thin =
soundboard edge unclamped/unglued around a majority of the board except =
at the belly rail and around the first part of the treble curve. He =
probably didn't thin the edge either come to think on it.
  There is at least one Chinese manufacturer who has been doing =
something like this for some time now -- not intentionally, though, and =
not by design. They failed to cut the notches deep enough and left the =
feathered rib ends too thick.

  Del

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