Sarah Fox wrote: > Hi John, Ric, et al., > > > The implications for a key action are rather obvious. It's a nice > innovation by S&S. My question is this: How much is the balance rail > rounded, and over what distance? (I'd be interested to try to duplicate it > in my Wissner.) > > Peace, > Sarah Sarah, Thanks for your interesting post. I am saving it for future study. There's likely to be relevant stuff here, especially about how some compliance could help efficiency. The impedance matching across a flexing beam (harmonic motion is a factor hear?) is intriguing but this will take more time to sift down to a conscious layers. Were you some sort of circus engineer before heading into piano (so called) technology? It looks like the clowns have better R&D than us piano people. But I always thought this and now I know for sure. It's not really the rail that is radiused it's a 1/2 dowel covered in felt replacing the usual ring-o-felt balance rail punching. The radius is about 6mm. What's a "Wissner"? John 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 [link redacted at request of site owner - Jul 25, 2015]
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