<html xmlns:v="urn:schemas-microsoft-com:vml" = xmlns:o="urn:schemas-microsoft-com:office:office" = xmlns:w="urn:schemas-microsoft-com:office:word" = xmlns:st1="urn:schemas-microsoft-com:office:smarttags" = xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; = charset=us-ascii"> <meta name=ProgId content=Word.Document> <meta name=Generator content="Microsoft Word 11"> <meta name=Originator content="Microsoft Word 11"> <link rel=File-List href="cid:filelist.xml@01C60617.A92BC3F0"> <link rel=Edit-Time-Data href="cid:editdata.mso">  <title>Message</title> <o:SmartTagType = namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"/>  <style>  </style>  </head> <body bgcolor="#D8D0C8" lang=EN-US link=blue vlink=blue = style='tab-interval: .5in'> <div class=Section1> Okay, it’s mass only.  If someone can give me a = typical scale description (gauges and lengths, including wound strings [with total = diameter and core diameter]), I think I can come up with a general figure, per cent = pitch raise, pretty quickly.<o:p></o:p> <o:p> </o:p> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: = pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of John Delmore Sent: Wednesday, December = 21, 2005 8:18 AM To: '<st1:PersonName = w:st="on">Pianotech</st1:PersonName>' Subject: RE: How to = explain a pitch adjustment<o:p></o:p> </div> <o:p> </o:p> 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.  <o:p></o:p> John (finally a bona fide member) = Delmore<o:p></o:p> <o:p> </o:p> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: = pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of jonathan stuchell Sent: Tuesday, December = 20, 2005 9:37 PM To: <st1:PersonName = w:st="on">Pianotech</st1:PersonName> Subject: Re: How to = explain a pitch adjustment<o:p></o:p> </div> <o:p> </o:p> <div>   Thats good, I want to know the   tension = per cent . That is a good constant, useful for many applications.  = <o:p></o:p> </div> <blockquote style='border:none;border-left:solid black = 1.5pt;padding:0in 0in 0in 4.0pt; margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'= > <div> ----- Original Message ----- = <o:p></o:p> </div> <div style='font-color:black'> From:</span= > <a href="mailto:thetuner@ivories52.com" = title="thetuner@ivories52.com">Geoff Sykes</a> <o:p></o:p> </div> <div> To: <a href="mailto:pianotech@ptg.org" = title="pianotech@ptg.org">'Pianotech'</a> = <o:p></o:p> </div> <div> Sent: = Tuesday, December 20, 2005 5:44 PM<o:p></o:p> </div> <div> Subject: RE: How = to explain a pitch adjustment<o:p></o:p> </div> <div> <o:p> </o:p> </div> <div> 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?<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> -- = Geoff<o:p></o:p> </div> <blockquote = style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'> -----Original = Message----- From: <a href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</a> [mailto:pianotech-bounces@ptg.org] On Behalf Of Cy Shuster Sent: Tuesday, December = 20, 2005 2:24 PM To: <st1:PersonName = w:st="on">Pianotech</st1:PersonName> Subject: Re: How to = explain a pitch adjustment<o:p></o:p> <div> 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).<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> 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.<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> 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!<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> --Cy--<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div>  <o:p></o:p> </div> </blockquote> </blockquote> </div> </body> </html>