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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=davidlovepianos@earthlink.net
href="mailto:davidlovepianos@earthlink.net">David Love</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">Pianotech</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> December 05, 2002 4:59 =
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: rear string =
lengths</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>We don't have the luxury of that much backscale =
length on
the standard S&M, I mean S&S where zero bearing is the usual
target. I assume that is one of yours.
</FONT></DIV></BLOCKQUOTE>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=2>It's a M&H
BB.</FONT></DIV>
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size=2></FONT> </DIV>
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<DIV><FONT size=2>I am curious about the bearing in the treble =
section as it
relates to backscale length. Minimizing the bearing in the bass =
is
something I am aware of for the reasons you mention. But what =
about in
the treble. Would you consider modifying the bearing there =
depending on
backscale length? </FONT></DIV></BLOCKQUOTE>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=2>Depends on what you
mean by "modify." And what you mean by "bearing." I go by string =
deflection
angles and adjust distance bearing to give me the string deflection =
angle I'm
after. No, I don't vary that much at all. Unless I'm working on one of =
the
S&S pianos with that ridiculously short tuned duplex backscale they =
used for
a while. Then I back off some.</FONT></DIV>
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size=2></FONT> </DIV>
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<DIV><FONT size=2>And back to the question posted earlier and =
addressed to
some degree by Ron O., what is the ideal backscale length for each
section? How much must the backscale length deviate from the =
ideal
length before you would consider modifying the bearing (if you
would)?</FONT></DIV></BLOCKQUOTE>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=2>Well, I can tell
you what I like to see back there, but as to whether or not it is ideal =
I can't
really say. I'm not yet convinced there is an <EM>ideal</EM>. Probably =
more like
an ideal range. Or, perhaps, an ideal for each type of scale -- long, =
short,
high-tension, low-tension, etc. -- modified by the characteristics of =
the
soundboard. </FONT></DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=2></FONT> </DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=2>Generally I like to
see (starting from the top of a typical 4-section scale) from 50 to 100 =
mm in
the top section; from 75 to 150 mm in the next section down; from 150 to =
200 mm
in the tenor section; and whatever you can get in the bass. This depends =
a lot
on what you want out of the bass and on how long the piano is. I'd be =
happy with
100 mm in a 150 cm grand but not in a 275 cm piano. </FONT></DIV>
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size=2></FONT> </DIV>
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<DIV><FONT size=2>And something else I've always wondered about, =
why, on many
pianos,</FONT><FONT size=2> do hitch pins in the treble and tenor of =
many
pianos not follow the curve of the bridge, but seem to go in a zig zag =
sort of
pattern? </FONT></DIV></BLOCKQUOTE>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 size=2>A =
safety device to
avoid setting up a stress line in the quite brittle gray iron
casting.</FONT></DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=2></FONT> </DIV>
<DIV dir=ltr><FONT face="Comic Sans MS" color=#000080 =
size=2>Del</FONT></DIV>
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size=2></FONT> </DIV></BODY></HTML>