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<DIV><FONT face=Arial color=#0000ff size=2><STRONG>Ahh, this exactly the type of
informed repartee I was looking for; and what a surprise as to the source
:)</STRONG></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><STRONG></STRONG></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><STRONG>comments
below...</STRONG></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><STRONG></STRONG></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><STRONG>Jude Reveley, RPT<BR>Absolute
Piano Restoration, LLC<BR>Lowell, Massachusetts<BR>(978)
323-4545</STRONG></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>----- Original Message ----- </FONT>
<DIV><FONT face=Arial size=2>From: "Ron Nossaman" <</FONT><A
href="mailto:rnossaman@cox.net"><FONT face=Arial
size=2>rnossaman@cox.net</FONT></A><FONT face=Arial size=2>></FONT></DIV>
<DIV><FONT face=Arial size=2>To: "Pianotech List" <</FONT><A
href="mailto:pianotech@ptg.org"><FONT face=Arial
size=2>pianotech@ptg.org</FONT></A><FONT face=Arial size=2>></FONT></DIV>
<DIV><FONT face=Arial size=2>Sent: Friday, October 05, 2007 12:50
AM</FONT></DIV>
<DIV><FONT face=Arial size=2>Subject: Re: Introducing the
Crownulator</FONT></DIV></DIV>
<DIV><FONT face=Arial><BR><FONT size=2></FONT></FONT></DIV>
<DIV><FONT face=Arial size=2>> <BR>>> For all you folks that have
already made your Farell/Wixey/Lowell <BR>>> dowmbearing guages and are
wondering what to do with your old bubble <BR>>> guages, I
introduce..<BR>>> <BR>>> "The Crownulator" (patent
pending)...:)<BR>> <BR>> Hi Jude,<BR>> A couple of things. A
counterclockwise indicator would be <BR>> nice. Would a digital indicator,
zeroed at dead flat, read <BR>> negative so you wouldn't have to subtract
from 0.75? Or are <BR>> there digitals switchable to "backward"?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><STRONG><FONT color=#0000ff>Indeed. This indicator
is, as I hinted, recycled from my downbearing bubble guage that I bought from
Pianotek for $60 many moons ago. </FONT></STRONG></DIV>
<DIV><BR>> <BR>> Next is, a compression ridge or two will give you a false
<BR>> positive crown reading on a flat or even concave board. Spacer <BR>>
feet at the ends of the bar would avoid that.</DIV>
<DIV> </DIV>
<DIV><STRONG><FONT color=#0000ff>Nice. I knew this would be the prototype. The
new and improved version will be the c<FONT color=#000000>RON</FONT>ulator
5000.</FONT></STRONG><BR>> <BR>> Then there's the "S" curve crown, which
can easily read <BR>> positive within the right 12" span.</DIV>
<DIV> </DIV>
<DIV><STRONG><FONT color=#ff0000><FONT color=#0000ff>My hope is that this tool
will yield more reliable data in the study of Pressure and Sag as
it relates to scaling, soundboard and rib design etc. I've thought about
compression ridges, "S" curves and all the other "anomolies" that depart
from our ideal of crown and how that might affect the data. Ideally, I would
love to set up some sort of laser grid that would automatically supply me with a
3D model on my computer. I've put a few calls into NASA, but I'm still
waiting. <FONT color=#ff0000> </FONT></FONT></FONT><FONT color=#0000ff>In
the meantime, I imagine there will be some learning curve as to the best way to
use the crownulator, to avoid the pitfalls or at least get an improved
look at what's going on under there; but I'm sure it beats my
ratty piece of twine that the cat keeps dragging out of my tool bag.
Specifically, before and after results of the board ribbed with no bridges, then
with bridges, then installed, then loaded should be interesting. Time will tell,
right?</FONT></STRONG></DIV>
<DIV><STRONG><FONT color=#ff0000><FONT
color=#0000ff></FONT></FONT></STRONG> </DIV>
<DIV><STRONG><FONT color=#ff0000><FONT color=#0000ff>Also Dale brings up
the fact that crown on a loaded board is often imperceptible when
there may actually be .010" over 12", for example. I've tried loading
punchings and holding a ruler under my twine to get a better measurement,
but I keep getting a cramp in sixth arm. BAAAAH! Problem
solved.</FONT></FONT></STRONG></DIV>
<DIV><STRONG><FONT color=#ff0000><FONT
color=#0000ff></FONT></FONT></STRONG> </DIV>
<DIV><STRONG><FONT color=#ff0000><FONT color=#0000ff>I would also like to humbly
suggest that we upgrade the way we describe crown. I've heard too many
descriptions of crown as an arc deflection without any relation to a span,
specifically as it concerns setting static downbearing, which just seems
incomplete. </FONT> </FONT></STRONG><BR>> <BR>> But who checks crown
anyway, eh? <G></DIV>
<DIV> </DIV>
<DIV><FONT color=#0000ff><STRONG>Why the crown elves, of course, that come into
the shop in the wee hours. Don't you have them in
Kansas?<BR></STRONG></FONT>> <BR>> Ron N<BR>>
<BR>></FONT></DIV></BODY></HTML>