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<DIV><FONT face=Arial size=2><STRONG>>> *Further, if we can't predict this
sag, we can't predict the dynamic <BR>>> bearing and angle of string
deflection, which means we don't know the <BR>>> pressure and are going to
have a rough time of making any rib scale that <BR>>> isn't a shot in the
breeze</STRONG>.*<BR>> <BR>> Who says we can't predict rib deflection? One
of the first <BR>> things I did after Del ruined my life by getting me
interested <BR>> in this stuff was to build a spreadsheet for designing ribs
<BR>> from the string scale. Calculating deflection against bearing <BR>>
load is exactly how I design rib scales. Works out pretty <BR>> close in the
piano after it's built too.</FONT></DIV>
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<DIV><FONT face=Arial size=2><STRONG>I didn't say we couldn't predict rib
deflection, only that we need said data to do so. I hear you about the
swamp though.</STRONG> <BR>> <BR>> <BR>>> *BTW, while I don't
make CC boards anymore, I did apprentice in a shop <BR>>> for
several years that made about 20 CC boards a year and I have to say <BR>>>
it was like being in the Wild West. We were total cowboys. The only <BR>>>
thing we paid attention to was emc (3.5%). Rib dimensions came right off
<BR>>> the old board, the compression crowning was all over the place
depending <BR>>> on the time of year and size of the panels/ribs, and we
set distance <BR>>> bearing with the spare change in our pocket. Yee haw!
Boy were those <BR>>> days fun and also one of the reasons that I'm so
compulsive now. :)*<BR>> <BR>> And the reason those of us building
RC&S boards have spent so <BR>> much time accumulating and trying to pass
on this information. <BR>> We as builders think it's time to make an attempt
to get <BR>> control of the processes and produce a less random
product.<BR>> <BR>> Ron N<BR></FONT></DIV>
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<DIV><FONT face=Arial size=2><STRONG>Right on!</STRONG></FONT></DIV>
<DIV><FONT face=Arial size=2><STRONG></STRONG></FONT> </DIV>
<DIV><FONT face=Arial size=2><STRONG>Jude Reveley, RPT<BR>Absolute Piano
Restoration, LLC<BR>Lowell, Massachusetts<BR>(978)
323-4545</STRONG></DIV></FONT></BODY></HTML>