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 --- Delwin D Fandrich <pianobuilders@olynet.com> wrote: > > ----- Original Message ----- > From: "David Love" <davidlovepianos@earthlink.net> > To: "Pianotech" <pianotech@ptg.org> > Sent: May 07, 2003 9:32 PM > Subject: Re: Unusual rib structure? > > > > I noticed, the other day, on a Hamburg Steinway C, > that the cutoff bar > was > > notched to allow for the feathered part of the rib > to extend beyond it to > > the rim. Is this counterproductive? Generally, > with cutoff bars do the > > ribs terminate at the cutoff bar? > > > > David Love > > davidlovepianos@earthlink.net > > > > > If you leave a substantial portion of a spruce panel > unsupported it will > buckle and probably crack. Assuming the soundboard > cutoff is truly a cutoff > then the extended portion of the rib is simply there > to keep the excess > panel from self-destructing. > > Del > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com
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