Laminated ribs

[Delwin D Fandrich]

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  ----- Original Message -----=20
  From: Erwinspiano@aol.com=20
  To: pianotech@ptg.org=20
  Sent: August 17, 2003 2:34 PM
  Subject: Laminated ribs



            Those of you who routinely use a laminated rib.=20
         =20
           My question is are these flat laminated pieces cut with a =
crown in them or are you crowning the ribs  in a curved caul. I know =
this was discussed some time back but hey I don't recall it. If they're =
laminated in a curve aren't they indeed more of a true arched rib (or =
arched beam) than a solid piece of  spruce rib stock with a machine cut =
curve. In the rib glued in a curve the ribs  the grain is indeed in an =
arch even if it was made thick enough to cut the bottom of the rib flat =
so as it had more material in the middle than on the ends. With a rib =
laminated in an arch config. it's also possible to have a rib of uniform =
dimension (if thats desireable).
          I don't know Phil F got me to thinking about that.
     Dale


In our case the curve is bent in during the laminating process. I.e., =
the cauls are made with a curve in them.=20

That curve can be most anything you want it to be, at least within =
reason. It does not necessarily have to be a continuous radius. Ditto =
the machined rib. Depending on the cutting template the curve can be =
whatever you want it to be.=20

We press our laminated ribs with an equal thickness throughout. We then =
machine them to our desired shape subsequent to laminating. The =
soundboard side is just cleaned up--the caul radius is the rib =
radius--and we shape the "bottom" side.

Del






     
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