> I have taken Model D bridges off that show a full 3/4" or more of > crown under the killer octave after fifty years. This same piano > probably had 1/8" of crown left on the longest ribs. I thought Steinway soundboards were glued up with flat ribs. Where did the 1/8" of crown come from? Terry Farrell ----- Original Message ----- [link redacted at request of site owner - Jul 25, 2015] To: "Pianotech" <pianotech@ptg.org> Sent: Saturday, April 12, 2003 10:33 PM Subject: Re: Killer Octave Question > Greg, > > If the crown was created by being deformed for many years we would see > all piano makes with this feature. If this were so they all would have > crowned bridges. But clearly some makes have crown and others don't. > Maple bridges are quite stiff and I doubt that the crown I see could be > caused by the ribs pushing up. There is after all the force pushing down > from the string bearing. I can't say if every single piano from these > sources had the same amount of crown to begin with or whether sometimes > they would leave it out but I can say with reasonable certainty that > practically every one I have removed from a soundboad had at least some > crown. It is much more obvious on the larger pianos than the smaller > ones. I have taken Model D bridges off that show a full 3/4" or more of > crown under the killer octave after fifty years. This same piano > probably had 1/8" of crown left on the longest ribs. > > I will try to get to your other question later. I am tiered from all the > back and forth with Ron's postings. > > John Hartman RPT > > John Hartman Pianos [link redacted at request of site owner - Jul 25, 2015] > Rebuilding Steinway and Mason & Hamlin > Grand Pianos Since 1979 > > Piano Technicians Journal > Journal Illustrator/Contributing Editor > Greg Newell wrote: > > John, > > I think I see your line of thought here. You have exclaimed that > > you rebuild with the same techniques you have found on the piano > > originally. Did I paraphrase that correctly? If so how can you tell if > > the original bridge was intended to be crowned from the factory or if it > > simply took on it's curvature from being mated to the soundboard panel > > for 'lo these many years? > > > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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