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<DIV><SPAN class=362114922-15022002><FONT face=Arial color=#0000ff =
size=2>David,</FONT></SPAN></DIV>
<DIV><SPAN class=362114922-15022002><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=362114922-15022002><FONT face=Arial color=#0000ff =
size=2>How
did you mesure the ratio ? By weighting or measure ?</FONT></SPAN></DIV>
<DIV><SPAN class=362114922-15022002><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=362114922-15022002><FONT face=Arial color=#0000ff =
size=2>Thanks.</FONT></SPAN></DIV>
<DIV><SPAN class=362114922-15022002><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=362114922-15022002><FONT face=Arial color=#0000ff =
size=2>Isaac</FONT></SPAN></DIV>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT =
face=Tahoma
size=2>-----Message d'origine-----<BR><B>De :</B> =
owner-pianotech@ptg.org
[mailto:owner-pianotech@ptg.org]<B>De la part de</B> David
Love<BR><B>Envoyé :</B> vendredi 15 février 2002 =
16:31<BR><B>À :</B>
Pianotech<BR><B>Objet :</B> Unequal key ratios:
puzzler<BR><BR></FONT></DIV>
<DIV><FONT size=2>Recently rebuilt a S&S model S c 1931. =
The
measured key ratios for the sharps were .48, for the naturals =
.51. I
considered moving the capstans on the sharps so the total leverage on =
each
would be equal. But when I started to set up samples and take
measurements, I found that the FW pattern was smooth and the =
corresponding
SWR's were equal. I would have expected that sharps to need less =
FW or,
with a smooth line front weighting, a varied SWR. =
Somewhere in the
system something else compensated for the different key ratios. =
Question
is where? All new parts, strike weights smoothed, BW all =
equal.
the job is now completed. I left the capstan positions alone and =
the FW
curve was pretty smooth, SWR all 5.9 - 6.0. A few bumps along =
the road
as is often the case, but one would have expected 6-10 grams less =
FW on
the sharps. Any opinions?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>David Love</FONT></DIV>
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