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<FONT face=Tahoma size=2><B>From:</B> pianotech-bounces@ptg.org
[mailto:pianotech-bounces@ptg.org] <B>On Behalf Of </B>Dave
Smith<BR><B>Sent:</B> October 13, 2007 7:31 PM<BR><B>To:</B> Pianotech
List<BR><B>Subject:</B> Re: Mystery part<BR></FONT><BR></DIV>
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<DIV>I almost hate to ask the question, but is this brace a good idea in the
first place? At least for someone who is just trying to restore at least
as good as the original. Not yet to the point of improving on piano
design perfection!?!</DIV>
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<DIV>Dave Smith </DIV>
<DIV>SW FL<SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3> </FONT></SPAN></DIV><SPAN class=140175416-15102007>
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<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3>Well, although plates can obviously be designed to function
quite well without them, they are not a bad idea. Often when these mechanisms
are used the plates are also a bit lighter so it's a <EM>Really Good
Idea</EM> to properly fit them and replace them during the final plate setting.
This is not so much a worry about the middle of the tuning pin panel deflecting
down as it is one of possibly overstressing the bass/tenor plate strut once
string tension is applied. These mechanisms keep some of the bending stress off
of the bass/tenor plate strut (generally a weak point in the casting).
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<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3>While better than nothing, the design found in your small
Knabe is not the best I've seen. The horn and wedge system found in Steinway
construction, for example, is a much better system. As is the system found
in certain larger Knabe grands: </FONT></SPAN></DIV>
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<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3><IMG alt="" hspace=0 src="cid:140175416@15102007-2757"
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<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
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<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3>This type has the advantage of being easily adjustable both
during original construction as well as later during
rebuilding.</FONT></SPAN></DIV>
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<DIV><SPAN class=140175416-15102007>[Quote] </SPAN></DIV>
<DIV><FONT face=Arial size=2>Del, A manufacturer's rep once told us the plate
stress coupler (a bolt in this case) served to enhance the tone by transferring
vibrations from plate to belly rail. Any truth to that? </FONT></DIV>
<DIV><FONT lang=0 face=Arial size=2 FAMILY="SANSSERIF" PTSIZE="10">Bob Maret,
RPT<BR>Piano Technician<BR>
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<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3>I'm not sure what advantage there would be
to transferring vibrations from the plate to the bellyrail. Bellyrails are
not generally designed to function well as energy transducers; i.e.,
soundboards. Their advantage is to structurally stabilize the plate and, if
anything, prevent energy losses by helping to prevent spurious plate
vibrations and resonances. </FONT></SPAN></DIV>
<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3></FONT></SPAN> </DIV>
<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3>As well, while the older Knabe plates I've encountered have
generally still been quite massive, Steinway took the opportunity to
significantly reduce the mass of their plates without any compromise in overall
stability.</FONT></SPAN></DIV>
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color=#000080 size=3></FONT></SPAN> </DIV>
<DIV dir=ltr><SPAN class=140175416-15102007><FONT face="Comic Sans MS"
color=#000080 size=3>Del</FONT></SPAN></DIV>
<DIV dir=ltr><SPAN class=140175416-15102007><!-- Converted from text/plain format -->
<P><FONT size=2>Delwin D Fandrich<BR>Piano Design & Manufacturing
Consultant<BR>620 South Tower Avenue<BR>Centralia, Washington 98531
USA<BR>Phone 360.736-7563<BR><<A
href="mailto:fandrich@pianobuilders.com">mailto:fandrich@pianobuilders.com</A>>
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