At 10:59 am -0600 8/8/06, Cy Shuster wrote: >That's fascinating, John. > >I can't see much benefit for sharps from the small trough. Won't >they feel much different from naturals? As I said, perhaps the photo does not make things clear enough. No, the trough gives a well-defined angle just in front of the back pins just like that in front of the front pins. It is with the "lazy" flat-topped rail that the naturals and the sharps will feel different. That was my point. When I've time I'll make a drawing, or even a movie to illustrate it. >Is there a second fulcrum shift as the key later hits the bump at >the natural's balance pin? That doesn't happen because the sharps are have a long shallow notch forward of the balance hole just as on other pianos. However this notch begins, on the Steinway, a good 6mm forward of the pin, so its function is solely to avoid knocking the rail; it has no effect at the balance. The same good effect as from the "trough" could be achieved in theory by cutting into the bottom of the key at the balance hole, but I presume this has not been tried, so far as I know, because a moment's thought will tell you this would leave only a tiny triangle of softwood between the balance pin and thin air and the balance holes would ovalize in no time. JD -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20060808/3e9c9824/attachment.html -------------- next part -------------- A non-text attachment was scrubbed... Name: sharp001.jpg Type: image/jpeg Size: 8098 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20060808/3e9c9824/attachment.jpg
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