Laminated ribs

[Delwin D Fandrich]

----- Original Message -----
From: "Ron Nossaman" <RNossaman@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: August 17, 2003 4:04 PM
Subject: Re: Laminated ribs


>
> >          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).
>
> Is a rib you make from a single piece of wood with curved grain an arch?
> The laminated rib isn't either because the laminations are glued
together.
> As long as the glue holds, it's a solid piece of wood.
>
> Ron N

Ah, I missed the original intent of the question. I agree with Ron, these
are no more structural arches than are the curved, laminated beams found in
the ceilings of many buildings.

Del