----- Original Message ----- From: "gordon stelter" <lclgcnp@yahoo.com> To: "Pianotech" <pianotech@ptg.org> Sent: May 08, 2003 3:33 AM Subject: Re: Unusual rib structure? > Del, > Maybe its also there because a rim makes a better > rib termination point/support/buttress than a > relatively flimsy cutoff bar. One can assume that > there is tremendous compressive stress on a rib, > end-to-end, on a loaded board, non? > ( Especialy on a compression crowned board. ) > Cheers, > Thump Not really. Until the board collapses there is some compression on the bottom side of the rib but the top of the rib is under tension. (Assuming a compression-crowned soundboard assembly.) Del
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