This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment MessageHi Alan, Smart client! ;-) My guess would be the following: As humidity cycles, the conformation of the wood around the tuning pin = cycles as well. As the wood "wiggles" to and fro around the pin, there = will be some slippage in the direction of the torque applied by the = string. It will be very subtle and slow, just like the changes in wood = conformation around the pin. This is only a theory. A good test of the theory would be a screw = stringer piano. Do those pianos go steadily flat, at least after the = string has fully tensilized? I would guess they don't, but I certainly = wouldn't stake my life on it. ----- Original Message -----=20 From: Alan=20 To: 'Pianotech'=20 Sent: Saturday, March 26, 2005 12:49 PM Subject: Flat Facts This question is so basic and naive, I fear the wrath of the list so I = will ask it annonymously ... Customer asked: "I understand that humidity change is the principle = cause for going out of tune, but if it gets flat than sharp, etc., why = is the long term trend always flat? In other words, if it's a fact that = the tuning pins are slowly turning counterclockwise with playing and = weather, why can't you just lock them in place, somehow, so the piano = stays close to pitch all the time?" I stood there staring stupidly and could not conjur a = sensible-sounding answer. What would YOU say? Mystery Writer Salem, MO -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.8.3 - Release Date: 03/25/2005 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/d1/ae/2a/4a/attachment.htm ---------------------- multipart/alternative attachment--
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