Rib Thinning

[Farrell]

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Thanks for the pics. Don't need more, was just curious. Interesting, for =
sure. I see you've changed  the entire rib pattern. I wonder what is was =
they were after with the original ribbing? I see where you are going =
with it. Seems logical.

I don't know that there would be any reason to put a dowel through the =
panel and bridge - why would you do it? On a compression-crowned board, =
a dowel is OK through the rib if you wish because you are not relying on =
the rib to have the strength to support the crown - the rib only needs =
to be strong enough to resist stretching by the panel. On the =
rib-crowned soundboard, you don't want anything going through the rib =
because that would create a weak spot on the rib - unless of course, the =
loss of strength was engineered somehow into the plan.

My method of attaching the bridges, modified after Del and Ron N., is to =
simply run a bunch of sheet-rock screws through the panel from the back =
into the bridge. I made up a bunch of large buttons (like 30 x 60 mm) =
that the screws go through first - that clamp the panel to the bridge =
real nice. I get glue squeeze out all along the bridge base. Maybe its =
overkill - whatever. I believe Del and Ron use regular little soundboard =
buttons and leave the screws and buttons in place. I remove mine and =
plug the soundboard back. Looks nice and clean. I just don't get along =
well with soundboard buttons. I suppose if they are not there they will =
never buzz either.

Terry Farrell
  ----- Original Message -----=20
  From: Richard Brekne=20
  To: Pianotech=20
  Sent: Wednesday, January 28, 2004 5:04 PM
  Subject: Re: Rib Thinning


  Thanks muchly for the advice Ron.=20

  Do I understand you to say that dowels even just through the panel and =
bridge are not all that great an idea ? ... or just through the ribs ?

  Terry.. here's a few pics.. 
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