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<DIV><FONT face=Arial size=2>Thanks Joe,</FONT></DIV>
<DIV><FONT face=Arial size=2>Excellent point and yet another that I hadn't
considered.</FONT></DIV>
<DIV><FONT face=Arial><FONT size=2>I rebuilt a<FONT
face=Garamond> </FONT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Garamond; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT
face=Arial>Schomacker grand that had a gold colored plain wire, original. I have
no idea what it was but I did save some. I did re-scale that piano in PScale
although I realize now I was unaware of the original
tensions.</FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Garamond; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">Fenton</SPAN></FONT></FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=defaziomusic@verizon.net href="mailto:defaziomusic@verizon.net">Joe
DeFazio</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, July 21, 2008 10:01
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: chickering quarter
grand-re-scale trichords</DIV>
<DIV><BR></DIV>
<DIV>
<BLOCKQUOTE type="cite"><SPAN class=Apple-style-span
style="COLOR: rgb(0,0,0)">
<DIV style="MARGIN: 0px"><SPAN
style="FONT-SIZE: medium; FONT-FAMILY: Helvetica"><B>From: </B></SPAN><SPAN
style="FONT-SIZE: medium; FONT-FAMILY: Helvetica">"Fenton Murray" <<A
style="COLOR: blue; TEXT-DECORATION: underline"
href="mailto:fmurray@cruzio.com">fmurray@cruzio.com</A>></SPAN></DIV>
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<DIV><FONT face=Arial size=2>Also, recently someone pointed out that
changing wire sizes (plain wire) did not change the breaking point % of a
note. After a few sample problems in P-Scale I confirmed this. This was
really a forehead slapper for me. If this is true, bridge re-scaling is
the only option for changing BP %.</FONT></DIV>
<DIV><FONT face=Arial size=2>Fenton</FONT></DIV></BLOCKQUOTE><BR>
<DIV style="MARGIN: 0px"><SPAN
style="FONT-SIZE: medium; FONT-FAMILY: Helvetica"><B>From: </B></SPAN><SPAN
style="FONT-SIZE: medium; FONT-FAMILY: Helvetica">Ron Nossaman <<A
style="COLOR: blue; TEXT-DECORATION: underline"
href="mailto:rnossaman@cox.net">rnossaman@cox.net</A>></SPAN></DIV><BR>
<BLOCKQUOTE style="PADDING-BOTTOM: 0px; PADDING-TOP: 0px"
type="cite"> Also, recently someone pointed out that
changing wire sizes (plain<BR></BLOCKQUOTE>
<BLOCKQUOTE style="PADDING-BOTTOM: 0px; PADDING-TOP: 0px"
type="cite"> wire) did not change the breaking point % of
a note. After a few<BR></BLOCKQUOTE>
<BLOCKQUOTE style="PADDING-BOTTOM: 0px; PADDING-TOP: 0px"
type="cite"> sample problems in P-Scale I confirmed this.
This was really a<BR></BLOCKQUOTE>
<BLOCKQUOTE style="PADDING-BOTTOM: 0px; PADDING-TOP: 0px"
type="cite"> forehead slapper for me. If this is true,
bridge re-scaling is the<BR></BLOCKQUOTE>
<BLOCKQUOTE style="PADDING-BOTTOM: 0px; PADDING-TOP: 0px"
type="cite"> only option for changing BP
%.<BR></BLOCKQUOTE><BR>On plain wires, yup. You can change tension, but to
change break%, you gotta change speaking length.<BR><BR>Ron
N<BR></SPAN></BLOCKQUOTE><BR></DIV>
<DIV>Hi Fenton,</DIV>
<DIV><BR></DIV>
<DIV>I pointed out the "constant BP problem" a week or so ago only after
slapping my own forehead repeatedly. Unfortunately, slapping my forehead
repeatedly still left the problem intact and my cognitive abilities less
so.</DIV>
<DIV><BR></DIV>
<DIV>Ron is 99.99% right in his reply. I don't think it will help you
much, if at all, but for logical completeness, I'll add that there is another
way to change break% instead of changing the speaking length: change the
wire composition. Stainless steel wire, or phosphor bronze, or yellow
brass, or anything else will have a different modulus of elasticity, density,
and the like, and these physical properties will change the break% when a
given speaking length is tensioned to the given pitch. Unfortunately, I know
of nothing available that will have a lower break% (meaning a stronger wire)
than modern steel piano wire. </DIV>
<DIV><BR></DIV>
<DIV>I'm only mentioning this for two reasons. One is that, in working
through scaling formulae there is usually a constant that relates to the wire
composition. If using a different type of wire, It is this constant
that would be changed. It is pretty common to take constants for
granted, and I always remind myself to take a hard look at the "taken for
granted" parts of any problem when trying to arrive at creative
solutions.</DIV>
<DIV><BR></DIV>
<DIV>The other reason is that I'm hoping against all odds that one of the
engineers/physicists out there on the list might know about any modern
materials that might be investigated for higher strength/lower break%.
If there are any out there that might realistically be tried (carbon
nanotubes are about a million times too expensive at the moment), I'd sure
like to know about them…. </DIV>
<DIV><BR></DIV>
<DIV>Joe DeFazio</DIV>
<DIV>Pittsburgh</DIV>
<DIV><BR></DIV>
<DIV>P. S. - Personally, I'm guessing that breakthroughs in material
science will be the next big thing in piano design and rebuilding (though CNC
routing and machining is pretty exciting, too, as is 3D printing).</DIV>
<DIV>
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