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<FONT face=Tahoma size=2><B>From:</B> pianotech-bounces@ptg.org
[mailto:pianotech-bounces@ptg.org] <B>On Behalf Of
</B>Erwinspiano@aol.com<BR><B>Sent:</B> February 18, 2006 11:31
AM<BR><B>To:</B> pianotech@ptg.org<BR><B>Subject:</B> Re: laminated
ribs<BR></FONT><BR></DIV>
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<DIV>In a message dated 2/18/2006 9:26:00 A.M. Pacific Standard Time,
rnossaman@cox.net writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px =
solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 =
size=2><BR> Dale wrote<BR>> Ok Now I,lm =
confused.
If were only trying to support only 400 to 600 <BR>> lbs. of down =
bearing
force as Del inferred recently or whatever one <BR>> calculates =
this to
be, then what's all the fuss about. <BR><BR>My loading =
of new
boards these days is typically half again <BR>over 600
lbs.<BR></FONT></BLOCKQUOTE>
<DIV> <EM> <STRONG>Ron, so you are saying a 900 lb bearing load =
is
probably an in the ball park average plus or minus for various =
sizes of
pianos & string scale tensions.</STRONG></EM></DIV>
<DIV><STRONG><EM> Then my comment a couple weeks =
ago
about bearing being 1000 lbs or more depending on who you ask =
wasn't
that far off this figure even though Del disagreed with that as =
being
"excessive."</EM></STRONG><SPAN class=953463523-18022006><FONT
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<DIV dir=ltr><SPAN class=953463523-18022006><FONT face="Comic Sans =
MS"
color=#000080 size=3>Consider a basic scale of moderately high =
tension. Say
40,000 lbs. overall. With this string tension 1,000 lbs of string =
downforce
equals 2.5% of scale tension. That is quite a lot considering that most
companies are claiming string downforce more on the order of 0.5% to =
1.5% of
string tension (which would be 200 to 600 lbs). I thought I was setting =
my
initial string downforce pretty high at around 1.0 to 1.5%. I don't like =
thinking about what I'd be doing to a board loading it up to 2.5%. I =
can't
imagine it being happy enough at that level to want to stay
there.</FONT></SPAN></DIV>
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<DIV dir=ltr><SPAN class=953463523-18022006><FONT face="Comic Sans =
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color=#000080 size=3>Del</FONT></SPAN></DIV></FONT></BODY></HTML>