Well, that thought certainly does come to mind. I don't remember the details of the Model 6000 all that well but there should have been at least 12 to 15 mm of clearance between the ribs and the backposts with the board completely flat. Seems to me something went wrong somewhere either during construction or later. ddf Delwin D Fandrich Piano Design & Fabrication 620 South Tower Avenue Centralia, Washington 98531 USA del at fandrichpiano.com ddfandrich at gmail.com Phone 360.736.7563 From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Ryan Sowers Sent: Monday, December 06, 2010 10:33 PM To: pianotech at ptg.org Subject: Re: [pianotech] Inverted soundboard Maybe another case of an enthusiastic technician making sure all those strings are seated on the hitch pins?? On Mon, Dec 6, 2010 at 9:47 PM, Delwin D Fandrich <del at fandrichpiano.com> wrote: Personally I'd be a little curious about just how all that reverse crown got in there. If the factory boys set the strings anywhere remotely close to the right place on those vertical hitches there shouldn't have been enough string bearing to force the board that far back. Flat, maybe, but not all the way back so the ribs are resting on the backposts. Makes me wonder just how there ended up being enough force against the bridges to cause this to happen in-what?-just 20 years. The fairly substantial ribs in these things should have been crowned to something like a 72' foot radius-don't ask-and I don't care how wet or dry the piano might have gotten in those 20 years I don't see how climate alone could have created all this damage. If the piano was in a very humid climate the soundboard should have done what soundboards do; developed a bunch of compression ridges and crushed. If it got all dry the panel should have just split wide open. Seems to me that to force that kind of inversion into the system there would have to have been a whole lot of excessive string bearing pressing against the bridges. Where did it come from? And is it still there? ddf -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20101206/fcef6549/attachment-0001.htm>
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