<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=utf-8"> <META content="MSHTML 5.50.4134.600" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face="Lucida Sans" color=#000080></FONT> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000080 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=Erwinspiano@AOL.COM href="mailto:Erwinspiano@AOL.COM">Erwinspiano@AOL.COM</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> January 21, 2002 1:08 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Baldwin Accu-Just = Hitch Pins--General Information</DIV> <DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 = face=Arial size=2 FAMILY="SANSSERIF">In a message dated 1/21/2002 10:40:39 AM Pacific = Standard Time, <A = href="mailto:pianobuilders@olynet.com">pianobuilders@olynet.com</A> writes:<BR><BR><BR> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px" TYPE="CITE">Subj:<B>Baldwin Accu-Just Hitch Pins--General = Information </B><BR>Date:1/21/2002 10:40:39 AM Pacific Standard Time<BR>From:<A = href="mailto:pianobuilders@olynet.com">pianobuilders@olynet.com</A><BR>= Reply-to:<A href="mailto:pianotech@ptg.org">pianotech@ptg.org</A><BR>To:<A href="mailto:pianotech@ptg.org">pianotech@ptg.org</A><BR><I>Sent = from the Internet </I><BR><BR><BR><BR></FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000080 = size=2 FAMILY="SANSSERIF">Dale, Carl, et al,</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"><BR>.<BR><BR></FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000080 = size=2 FAMILY="SANSSERIF">Mostly, how much loading any specific = soundboard must have is a function of how massive and how stiff the soundboard = assembly is. This is not a universal constant. Dale’s string deflection = numbers would not work[at] all for one of our boards. As to whether they would work = for one of Baldwin’s current boards—I cant say. With the = Accu-Just system Baldwin has used a fairly light crown radius—</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"><BR></FONT><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2 = FAMILY="SANSSERIF"></BLOCKQUOTE> <DIV><BR><BR></FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" = face=Arial color=#000000 size=2 FAMILY="SANSSERIF">  Del--Just so it = doesn't appear that you're dismissing my downbearing deflection no. derived from the experience myself and others out of hand, let me Re-state that these = no.s are real do work well in NON--REDESIGNED soundboards, which I must point = out most of us are doing. I think I was fairly specific as to the type of = replacement board application that these numbers do commonly work in. </FONT></FONT></DIV></BLOCKQUOTE> <DIV><FONT face="Lucida Sans" color=#000080>No, I'm not dismissing = them at all. And I'm certainly not dismissing your experience. I thought I was being = pretty specific when I said your downbearing numbers wouldn't work for our = soundboards. And they may not work for Baldwin boards--which is what the original = discussion was about if I recall correctly. Anyway, my apology if I wasn't specific = enough--I'm just trying to point out that these numbers are specific to = the type and design of the boards you put in. They may or may not work well for = the boards someone else puts in using some (perhaps only slightly) different = procedure. Or some different combination of materials. </FONT></DIV> <DIV><FONT face="Lucida Sans" color=#000080></FONT> </DIV> <DIV><FONT face="Lucida Sans" color=#000080>There are lots of = variables that go into setting up a soundboard system, including determining the amount of = string loading on the soundboard. The numbers you and others are quoting are = numbers that work well for you. You've done a lot of boards and you're = comfortable with them. But they are not universal numbers for all soundboards and for all = pianos though they typically get used that way. When the question is asked, = "How much downbearing should there be on a new soundboard?" I'm not sure we can = answer without either asking or giving a bit more information, as you're doing below:</FONT></DIV> <DIV><FONT face="Lucida Sans" color=#000080></FONT> </DIV> <DIV><FONT face=arial,helvetica><FONT lang=0 = style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2 FAMILY="SANSSERIF"><FONT = face="Lucida Sans" color=#000080 size=3></FONT> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"><FONT face="Lucida Sans" color=#000080 size=3></FONT><FONT = face="Lucida Sans" color=#000080 size=3></FONT><FONT face="Lucida Sans" = color=#000080 size=3></FONT> <DIV><FONT face="Lucida Sans" color=#000080 = size=3></FONT><BR>  These values of downbearing  work well for me on 60ft. rib crowned boards(treble radius are tighter) but with some modification of the = system of prestressing, I suggest the procedure could be applied to many if not = most soundboard systems that exhibit some stiffness as they're being test = loaded. Obviously totally flacid or under crowned systems woulf require a = different approach.<BR>  Perhaps you'd like to share what values you = consider workable in a non-redesigned rib crowned soundboard system ? Or in = your design system for that matter.</DIV></BLOCKQUOTE> <DIV><FONT face="Lucida Sans" color=#000080 size=3>I do so in = classes I give on the subject. But without being able to illustrate and discuss the design = of the soundboard the numbers wouldn't mean much. Let's just say that they have = somewhat more flex in them than you're probably used to and they have = somewhat more crown, hence the downbearing settings are quite a bit higher than = you would use.</FONT></DIV> <DIV><FONT face="Lucida Sans" color=#000080 = size=3></FONT> </DIV> <DIV><FONT face="Lucida Sans" color=#000080 = size=3>Del</FONT></DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"><FONT face="Lucida Sans" color=#000080 size=3></FONT><FONT = face="Lucida Sans" color=#000080 size=3></FONT></FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 = size=2 FAMILY="SANSSERIF"><FONT face="Lucida Sans" color=#000080 size=3></FONT><BR> </BLOCKQUOTE></FONT></FONT></BODY></HTML>