This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Wm: I too have experienced slipping unisons which seem difficult to explain. = I've thought about it for years. I have a theory which I call = "SOUNDBOARD SHAKING" for lack of a better term. We strike the keys hard during tuning to settle the segments of the = string. Maybe there are still tidbets of friction left as the string = snakes through the bridge pins. Just striking each individual string = isn't enough to free the friction. Later during hard playing the = soundboard and bridges are SHAKING more intensely and these bits of = friction surrender and the unison goes out of tune. Maybe there is more = friction in the bridge pins than the agraffes, upper bearing and capo = bar.=20 It's just a theory. How can one prove it? Sy Zabrocki ----- Original Message -----=20 From: Wimblees@aol.com=20 To: caut@ptg.org=20 Sent: Saturday, April 10, 2004 12:22 PM Subject: why does a string go out of tune? OK, what exactly is happening when a string goes out of tune. I know = about climatic changes that effect the soundboard. This causes the who = piano, or at least whole sections to go out of tune. I can accept that. = But I pride myself on setting the string and the pin. I am a pounder. On = new pianos, (at least new to me), and especially concert instruments. I = beat the daylights out the notes to get them to stabilize. But there are = still strings that go out. That is why we tune concert instruments = numerous times, with strings still going out.=20 I tune a D for a church once a month. I pound until my fingers hurt = but I leave the string with the lights standing absolutely still. But = every time I tune it, the piano is "in tune" in that it hasn't changed = pitch over all, but there are at least 2 dozen strings that have = "slipped." They are 2 or 3 cents off. I'm not talking notes, I am = talking string. The right string of one note is 3 cents low, or the left = string of another note is 2 cents flat.=20 Why is that? Why do just these strings go out, and not the other ones? = Am I still not pounding hard enough, or is the combination of slight = variations in temperature, combined with strings that maybe weren't set = right, causing this? Inquiring minds want to know. Wim Willem Blees, RPT Piano Technician School of Music University of Alabama ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/27/57/19/52/attachment.htm ---------------------- multipart/alternative attachment--
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