This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment It is an interesting question. The difference in tension needed to cause a one cent difference in pitch is going to vary according to the mass (and possibly the stiffness) of the string (I'll have to check my old physics books tonight). So, to get a general value for added tension per cent PR, you'd have to consider, also, the size of the piano, i.e. you'd have different values for a spinet, a large upright and a large grand. John (finally a bona fide member) Delmore _____ From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of jonathan stuchell Sent: Tuesday, December 20, 2005 9:37 PM To: Pianotech Subject: Re: How to explain a pitch adjustment Thats good, I want to know the tension per cent . That is a good constant, useful for many applications. ----- Original Message ----- From: Geoff Sykes <mailto:thetuner@ivories52.com> To: 'Pianotech' <mailto:pianotech@ptg.org> Sent: Tuesday, December 20, 2005 5:44 PM Subject: RE: How to explain a pitch adjustment That raises an interesting diversionary question. What's the amount of tension per cent? How many cents of change, over the entire piano, would create a ton of tension change? -- Geoff -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Cy Shuster Sent: Tuesday, December 20, 2005 2:24 PM To: Pianotech Subject: Re: How to explain a pitch adjustment I measure pitch on all the A's before I start, and record this for the customer on a graph on the invoice. This gives them a great visual about what work is needed. The graph indicates "fine tuning" range (+/1 eight cents for me). The analogy I use is sanding: if wood is very rough, you can't start with the 1000-grit paper; multiple passes are required. Same thing for painting: with regular maintenance, one coat covers, otherwise you may need several. A description of the forces involved helps: 15 to 20 tons of tension overall; a pitch raise can add a ton of tension (right?), yet a fine tuning requires < 1% accuracy. No wonder it doesn't last! --Cy-- ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/be/29/cc/0f/attachment.htm ---------------------- multipart/alternative attachment--
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