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<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">F<EM>rom
what I see on their website, they clamp the ribs on a curved surface. Am I
right to suppose that in this case the ribs were shaped curve also? <SPAN
lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">With
the same curve as the clamping surface ? </SPAN></EM></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000>Mabe yes, maybe no. I use clamping cauls of the same radius as the
rib. Steinway NY uses flat ribs and curved cauls. I don't know what Ciresa
does.</FONT></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><EM>If
so, maybe they used the standard 60 ft radius? </EM></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000>Wereas I will agree that many shops likely use a 60 ft radius for
their ribs, I don't know of anything really "standard" about it. I've
never cut (or laminated) a 60 ft radius into a rib. I don't have a 60 ft
radius caul.</FONT></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><EM>As
for the MC at ribbing, I don’t know, but I will look closely at the conditions
when my board is flat again. I suppose it is a combination of rib and
compression crowning. I’ll know more when they answer my inquiry.
But if they indeed glued the curved ribs on a curved surface, then the MC at
gluing time would be that when my board has the same curve as their hardware,
not?</EM></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000>Yes indeed - you are correct. Sorry 'bout that. I didn't have my
thinking cap firmly attached for the last email. That is also true if the ribs
were flat and pressed in a curved caul. So you're right - no way to tell what
the ribbing MC was by looking at soundboard curvature.</FONT></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><EM>Anyway,
there is no advantage in drying more than when the board is just flat, if I get
you well. So first I must do is bring the board back to
flat.</EM></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000>Yeah, I think we can say that safely - if the board inverts, it is
too dry! Also, if the ribs do have a radius, then if you dry the board down to a
point where the rib radius is less than that prior to gluing to panel, you will
be putting the panel in tension - kinda the same as reverse crown as far as the
panel is concerned.</FONT></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000></FONT></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000>But get info on how much to dry from someone who does that. I
don't dry my soundboards prior to installation - so what do I
know?</FONT></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><EM>How
long do I have to do the board fitting in the piano before it swells again
? I suppose that any fitting done when the board changes dimensions again
is of no value. Or is this overkill ? Relative humidity in my
working environment is about 40 % at this time of year and global warming
process.</EM></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000>That just all depends on the differential in RH between the hot
box and the shop. Best way to tell is to let board equilibrate with shop,
measure crown, and then stick it in the hot box and measure crown at
regular intervals. That will give you a fair idea of how fast the process will
go the other way.</FONT></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><EM>Incredible
how you can read tons about a subject, you only learn really when you put your
hands on it.</EM></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000>Scary sometimes!</FONT></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"></SPAN> </P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><FONT
color=#000000>Terry Farrell<o:p></o:p></FONT></SPAN></P></FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=collin.s@skynet.be href="mailto:collin.s@skynet.be">Stéphane
Collin</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">'Pianotech List'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, January 16, 2008 1:01
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Soundboard installation with
hide glue</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Hi
Terry.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Thanks
for chiming in.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">I
think I will definitely use the cold liquid hide glue. There is only one
try for the process, other than ordering a new board if I mess up this
one.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">I
don’t know the data you ask about the board (I promise next time, which will
be soon, I will ask this first). The board has been made by Ciresa in
Italy, intended to be a close copy of the original, which was a 7’2” Bechstein
piano board from 1873. They did ask me for specifications, but I told
them to do their usual standard routine (I believed that they knew better than
I, and still believe so at the time I write this). I will ask them how
they proceeded.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">From
what I see on their website, they clamp the ribs on a curved surface. Am
I right to suppose that in this case the ribs were shaped curve also ?
With the same curve as the clamping surface ? If so, maybe they used the
standard 60 ft radius ? As for the MC at ribbing, I don’t know, but I
will look closely at the conditions when my board is flat again. I
suppose it is a combination of rib and compression crowning. I’ll know
more when they answer my inquiry. But if they indeed glued the curved
ribs on a curved surface, then the MC at gluing time would be that when my
board has the same curve as their hardware, not ?<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Anyway,
there is no advantage in drying more than when the board is just flat, if I
get you well. So first I must do is bring the board back to
flat.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">How
long do I have to do the board fitting in the piano before it swells again
? I suppose that any fitting done when the board changes dimensions
again is of no value. Or is this overkill ? Relative humidity in
my working environment is about 40 % at this time of year and global warming
process.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Incredible
how you can read tons about a subject, you only learn really when you put your
hands on it.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Best
regards,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">And
thanks again.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Stéphane
Collin.</SPAN></P></DIV></BLOCKQUOTE></BODY></HTML>