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<DIV><FONT face=Arial size=2> David and =
list</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> all your =
questions
are good ones and since I started the ditch the bushings campaign allow =
me to
interject one potent argument and or bias.</FONT></DIV>
<DIV><FONT face=Arial size=2> Any tuner that has ever =
tuned a good
original 20's stwy or other well fit piano has found that they tune
remarkably well and flaggpoling is essentially a none =
issue.
The pins render as better or at least as easily as any bushing fit block =
and the
pins are not leaning against the plate(even after all these years) =
because
of a good tight plate flange/block fit and this is a piano system that =
has
endured for how many years?</FONT></DIV>
<DIV><FONT face=Arial size=2> It seems to me that any piano =
that has a a
good block to plate flange fit ( and 40 screws)should be able to =
duplicate the
stable and tunable Steinway style system. </FONT></DIV>
<DIV><FONT face=Arial size=2> As others have said =
one of the
advantages to bushing is a dust/liquid barrier. I like Willis Snyder's =
idea of
some form of wood colored plastic insert for those of us who might need =
that for
school church or bar applications.</FONT></DIV>
<DIV><FONT face=Arial size=2> I addressed the issue of =
directional
force in my first post on the subject.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>
Dale Erwin</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV style="FONT: 10pt arial">----- Original Message -----
<DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A
href="mailto:skolnik@attglobal.net" =
title=skolnik@attglobal.net>David
Skolnik</A> </DIV>
<DIV><B>To:</B> <A href="mailto:pianotech@ptg.org"
title=pianotech@ptg.org>pianotech@ptg.org</A> </DIV>
<DIV><B>Sent:</B> Saturday, May 12, 2001 10:26 AM</DIV>
<DIV><B>Subject:</B> Re: Ditch the tuning pin bushings</DIV></DIV>
<DIV><BR></DIV>Dear All-<BR><BR>This thread is extraordinary for the =
range of
issues it contains, and it would be a shame if it dissipates before, at =
least
some of these issues crystallize (didn't want to go so far as to =
say
resolve). There is undoubtedly some overlap in the
following.<BR><BR><U>The Issues<BR><BR></U>How do the 'Lines of Force' =
differ in
an openface block; bushing-less covered block; covered block with
bushings?<BR><BR>Do the 'lines of force' of a bushing-less block change =
if, over
time, the pins, en masse, begin to contact plate? =
Would such
an occurrence necessarily be due to poor flange fit, or could either =
poor top
fit or soft wood be factors?<BR><BR>How much pressure against what =
resilience
factor (durometer?) would be required to have an impact on these =
"lines of
force'? At what point does 'support' begin to alter =
function?<BR><BR>Would
you assume that a new or newly rebuilt instrument without bushings in =
which
tuning pins already contacting plate is starting out with an acceptable
alteration in its design parameters? <BR><BR>What is the intended =
design
purpose of plate bushings? Which are unintended side effects?<BR>- Dust =
and beer
repellant<BR>- Centering of drilling for tuning pin<BR>- Support against =
flagpolling / springing<BR>- Alteration of 'lines of force'<BR>- =
Contribute
additional torque to rotation of pin<BR><BR>How would intended purpose =
dictate
material employed (soft wood, hard wood, delignit, plate contact) =
?<BR><BR>How
do tuning pin bushings contribute or detract from TUNABILITY, as opposed =
to
tuning STABILITY?<BR><BR>To what degree (if any) is the springing / =
flagpolling
tendency a valuable tuning tool?<BR>How does the density of the pinblock =
material used with a bushing-less plate affect the ability to use =
springing
effectively?<BR><BR>What is physically taking place in =
'springing'? What
is happening to pin, along how much of its length? to the top of =
the
tuning pin hole or the bushing?<BR><BR>What part do characteristics of =
the
tuning pin play in tuning
characteristics?<BR><X-TAB> &nbs=
p;</X-TAB>a)
Tolerance to nominal
size<BR><X-TAB> </X-TAB>b)=
Type
of =
steel<BR><X-TAB> </X-TAB>c=
)
Method of thread
formation<BR><X-TAB> </X-T=
AB>d)
Finish (blue, nickle, etc)<BR><BR>Do small and large ply blocks have =
different
tactile tuning characteristics if measured at the same static
torque?<BR><BR>Relationship of pin maneuverability to friction ratio of =
front
string bearing points as a determinant of tunability. What is too =
little
friction? too much?<BR><BR><BR>Please remember that you will be marked
"incorrect' for any questions unanswered. <BR><BR><BR>David
Skolnik<BR><BR><BR></BODY></HTML>