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<DIV><SPAN class=741244610-22062003><FONT face=Arial color=#0000ff =
size=2>Hello
Tom,</FONT></SPAN></DIV>
<DIV><SPAN class=741244610-22062003><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=741244610-22062003><FONT face=Arial color=#0000ff =
size=2>Indeed
your comment make sense, the lightening is to be supported by the =
pianist's hand
but indeed the whippen ratio is probably changing, as the friction =
between the
capstan and whippen heel).</FONT></SPAN></DIV>
<DIV><SPAN class=741244610-22062003><FONT face=Arial color=#0000ff =
size=2>These
virtual changes are probably not the same depending the speed the key is =
played,
but I just suspect it, don't see why it should be.</FONT></SPAN></DIV>
<DIV><SPAN class=741244610-22062003><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=741244610-22062003><FONT face=Arial color=#0000ff =
size=2>If
there is a reaction time between the magnets then they act as springs =
are not
they ?</FONT></SPAN></DIV>
<DIV><SPAN class=741244610-22062003><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=741244610-22062003><FONT face=Arial color=#0000ff =
size=2>Is
there one ???????</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN =
class=741244610-22062003>I wish
I will be experimenting with those before the end of the month
.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=741244610-22062003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN =
class=741244610-22062003>I
showed the setup to Stephen Paulello, and he find the idea very neat, he =
experimented once with a magnet driven letoff, that suppress the =
friction at the
button, but indeed too much problems to be precise and
consistent.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=741244610-22062003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN =
class=741244610-22062003>Very
interesting project, and a generous Richard !</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=741244610-22062003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=741244610-22062003>Greetings.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=741244610-22062003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN =
class=741244610-22062003>Isaac
OLEG</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=741244610-22062003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=741244610-22062003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<P><FONT size=2>Isaac OLEG<BR><BR>Entretien et réparation de
pianos.<BR><BR>PianoTech<BR>17 rue de Choisy<BR>94400 VITRY sur
SEINE<BR>FRANCE<BR>tel : 033 01 47 18 06 98<BR>fax : 033 01 47 18 06 =
90<BR>cell:
06 60 42 58 77 </FONT></P>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT =
face=Tahoma
size=2>-----Message d'origine-----<BR><B>De :</B>
pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]<B>De la =
part
de</B> Thomas Cole<BR><B>Envoyé :</B> dimanche 22 juin =
2003
10:10<BR><B>À :</B> Pianotech<BR><B>Objet :</B> Re: =
Virtual
Capstan<BR><BR></FONT></DIV>Bob,<BR><BR>In your analogy, it wouldn't =
matter if
you lifted the sack of sugar directly or by means of repelling =
magnets
because there's no difference in leverage.<BR><BR>I believe the idea =
is not
that the magnets are not supplying extra force, nor removing weight as =
wippen
assist springs do, but that they are shifting the position of capstan =
and heel
which changes the action ratio. Lower ratio equals less DW. It remains =
to be
seen if there is any advantage in actual playing. If Richard is =
getting
favorable DW/UW measurements, and I don't doubt that he is, that's one =
thing,
but it's only a theoretical point.<BR><BR>Tom Cole<BR><BR><A
class=moz-txt-link-abbreviated
href="mailto:BobDavis88@aol.com">BobDavis88@aol.com</A> wrote:<BR>
<BLOCKQUOTE cite=midc3.352eed53.2c26828e@aol.com type="cite"><FONT =
face=arial,helvetica><FONT lang=0 face=Arial size=2
family="SANSSERIF">Imagine holding a 10-lb. sack of sugar. You =
feel it as
ten pounds. Now attach a powerful magnet to the bottom of the sack, =
and a
powerful repelling magnet in your hand. The magnets might not touch, =
but is
the sugar lighter? No. It might even float a few inches in the air, =
but you
still feel ten pounds of weight in your hand, the same as if it were =
sitting
on top of a coil spring which you were holding.<BR><BR>This is =
because the
magnets are part of the lever system. In order to actually remove =
weight
from the system, they have to be external to it. This is true as =
well of
springs. Wippen assist springs are external to the system. =
Their force
acts against the support flange, and in turn upon the [theoretically =
rigid]
wippen mount rail. In order for a pair of magnets to store potential =
energy
in the deformation of the magnetic field, one of them must be =
mounted
outside the moving part of the system; i. e., on the action =
frame.<BR><BR>I
think Richard should re-do his measurements.<BR><BR>Bob
D</FONT></FONT></BLOCKQUOTE><BR></BLOCKQUOTE></BODY></HTML>