<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; ">Wow, beautiful =
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white-space: normal; widows: 2; word-spacing: 0px; "><SPAN =
class="Apple-style-span" style="border-collapse: separate; =
border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Lucida =
Grande; font-size: 12px; font-style: normal; font-variant: normal; =
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white-space: normal; widows: 2; word-spacing: 0px; "><SPAN =
class="Apple-style-span" style="border-collapse: separate; =
border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Lucida =
Grande; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
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0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; =
white-space: normal; widows: 2; word-spacing: 0px; "><SPAN =
class="Apple-style-span" style="border-collapse: separate; =
border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Lucida =
Grande; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: =
0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; =
white-space: normal; widows: 2; word-spacing: 0px; "><SPAN =
class="Apple-style-span" style="border-collapse: separate; =
border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Lucida =
Grande; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: =
0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; =
white-space: normal; widows: 2; word-spacing: 0px; "><SPAN =
class="Apple-style-span" style="border-collapse: separate; =
border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Lucida =
Grande; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: =
0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; =
white-space: normal; widows: 2; word-spacing: 0px; "><DIV>Giovanni =
Voltaggio</DIV><DIV>Austin, Texas</DIV><DIV><FONT =
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></DIV><DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE =
type="cite"><DIV style="margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><FONT face="Helvetica" =
size="3" color="#000000" style="font: 12.0px Helvetica; color: =
#000000"><B>From: </B></FONT><FONT face="Helvetica" size="3" =
style="font: 12.0px Helvetica">Overs Pianos <<A =
href="mailto:sec@overspianos.com.au">sec@overspianos.com.au</A>></FON=
T></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: =
0px; margin-left: 0px; "><FONT face="Helvetica" size="3" =
color="#000000" style="font: 12.0px Helvetica; color: =
#000000"><B>Date: </B></FONT><FONT face="Helvetica" size="3" =
style="font: 12.0px Helvetica">October 15, 2005 7:41:14 PM =
CDT</FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; "><FONT face="Helvetica" =
size="3" color="#000000" style="font: 12.0px Helvetica; color: =
#000000"><B>To: </B></FONT><FONT face="Helvetica" size="3" =
style="font: 12.0px Helvetica">Pianotech <<A =
href="mailto:pianotech@ptg.org">pianotech@ptg.org</A>></FONT></DIV><D=
IV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT face="Helvetica" size="3" color="#000000" =
style="font: 12.0px Helvetica; color: #000000"><B>Subject: =
</B></FONT><FONT face="Helvetica" size="3" style="font: 12.0px =
Helvetica"><B>Sound board trenching and stuff</B></FONT></DIV><DIV =
style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; "><FONT face="Helvetica" size="3" color="#000000" =
style="font: 12.0px Helvetica; color: #000000"><B>Reply-To: =
</B></FONT><FONT face="Helvetica" size="3" style="font: 12.0px =
Helvetica">Pianotech <<A =
href="mailto:pianotech@ptg.org">pianotech@ptg.org</A>></FONT></DIV><D=
IV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; min-height: 14px; "><BR></DIV> <BR =
class="Apple-interchange-newline"><SPAN class="Apple-style-span" =
style="border-collapse: separate; border-spacing: 0px 0px; color: =
rgb(0, 0, 0); font-family: Lucida Grande; font-size: 12px; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; text-align: auto; =
-khtml-text-decorations-in-effect: none; text-indent: 0px; =
-apple-text-size-adjust: auto; text-transform: none; orphans: 2; =
white-space: normal; widows: 2; word-spacing: 0px; "><DIV>Hi =
all,</DIV><DIV><BR></DIV><DIV>A couple of weeks ago (can't remember the =
name of the thread or to which list it was posted), Dean May floated the =
idea of trenching the sound board at the rear, adjacent to A1, as an =
alternative means to cutting a full soundboard =
float.</DIV><DIV><BR></DIV><DIV>As someone responded to Dean's =
suggestion, we've been trenching boards for many years now (since about =
the mid 90's). Seiler have been trenching the entire sound board =
perimeter for even longer. We tried this also, but after a serious of =
experiments over several years the idea has evolved to that which you =
see below. This image is of a Kawai KG6 that we're rebuilding at the =
moment. The trench depth is 5 mm, half that of the panel thickness. We =
fitted rib extensions and re-crown the board, fitted an Overs action and =
are in the process of a full refinish. We've kept the original bridges, =
even though the long bridge is a little lower than my preference. We've =
re-cut the notching and refinished the board. The plugged perimeter bolt =
hole (to the left of image) is a consequence of the Oak rim in these =
early KG series pianos. Oak is a good wood for rims but it is prone to =
corroding the fittings. Its not usual to twist off two or three =
perimeter bolts when removing a KG plate (we replace the original bolts =
with heavier gauge zinc plated coach bolts - with dome nuts fitted for =
looks - to avoid getting cursed-in-the-box sometime mid century). =
Normally, if replacing a board, we would use the Baldwin plate mounting =
system. But when re-crowning an existing board we leave the original =
plate mounting dowels in place. We typically will need to pack the =
stringing pillows by up to 5 mm at the mid-board area to establish a =
workable down bearing with a re-crowned =
panel.</DIV><DIV><BR></DIV><DIV>I've taken a series of images of the =
re-crowning process for this rebuild. I'm putting them together for a =
class I'm giving in Auckland on the 29th. The New Zealand branch of the =
APTTA is holding a mini-convention in Auckland on Oct 29 and 30. Anyone =
feeling like a tax deductible weekend in New =
Zealand?</DIV><DIV><BR></DIV><DIV>Ron O.</DIV><DIV><BR></DIV><DIV><IMG =
src="cid:A74D44A1-A279-4DE0-931A-F00D132ACB9C@local"></DIV><X-SIGSEP><PR=
E style="white-space: pre; ">--
</PRE></X-SIGSEP><DIV><FONT face="Times New Roman" size="+1" =
color="#0000FF"><B style="color: rgb(0, 0, 255); font-family: Times =
New Roman; font-size: 14px; font-weight: bold; "><SPAN =
class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: =
Times New Roman; font-size: 14px; font-weight: bold; ">OVERS PIANOS - =
SYDNEY</SPAN></B></FONT></DIV><DIV><FONT color="#000000"><I =
style="font-style: italic; "><SPAN class="Apple-style-span" =
style="font-style: italic; "> </SPAN></I></FONT><FONT =
color="#0000FF"><I style="color: rgb(0, 0, 255); font-style: italic; =
"><SPAN class="Apple-style-span" style="color: rgb(0, 0, 255); =
font-style: italic; ">Grand Piano Manufacturers</SPAN></I></FONT><FONT =
color="#000000"><BR>_______________________</FONT></DIV><DIV><FONT =
size="-2" color="#000000"><BR style="font-size: 9px; =
"></FONT><FONT color="#000000">Web <A =
href="http://overspianos.com.au">http://overspianos.com.au</A></FONT></D=
IV><DIV><FONT color="#000000"><A =
href="mailto:ron@overspianos.com.au">mailto:ron@overspianos.com.au</A><B=
R>_______________________</FONT></DIV><BR =
class="Apple-interchange-newline"></SPAN></BLOCKQUOTE></DIV><BR></DIV></=
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