In an upright piano the soundboard liner is not exactly "structural." That is, it is the member to which the soundboard panel is glued but it does not support anything else: no string tension load and no plate. In the production piano I just made the cutoff bar extend the full width of the piano and moved it up some; the pinblock did not extend down quite as far as some. This made it possible to locate the bridge very close to the middle of the ribs. This could probably be done during a retrofit as well. It might take a bit of hacking on the original pinblock. Each would be a separate case. ddf Delwin D Fandrich Piano Design & Fabrication 6939 Foothill Court SW, Olympia, Washington 98512 USA Phone 360.515.0119 — Cell 360.388.6525 del at fandrichpiano.com — ddfandrich at gmail.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Gene Nelson Sent: Sunday, May 20, 2012 10:09 PM To: pianotech at ptg.org Subject: Re: [pianotech] S&S K(52) Restoration So on an upright you can remove some structural material probably up to the point where you are getting into the pin block??? - allowing a bit longer rib up there so you are not forced to locate the bridge at the point on the rib where tapering begins Am I seeing this design feature accurately?? Sent from my iPhone On May 20, 2012, at 9:16 PM, Ron Nossaman <rnossaman at cox.net> wrote: > On 5/20/2012 12:19 PM, Gene Nelson wrote: > >> *** Goes to show: Comparing Del’s concept drawing of the Z-Bar >> assembly and your board it appears the intention is to center the bridge on the ribs. > > That's my intent in grands too, which helps define the shape and positioning of the bass cutoff. You unfortunately can't center the bridge on the treble ribs in a grand with the placement of the fish because the bridge is too close to the belly rail. > > Ron N
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