<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=us-ascii"> <META content="MSHTML 6.00.2800.1276" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2>Vince, </FONT></SPAN></DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2>I believe that you are also changing the moment of inertia with changes in = regulation parameters , attack angle of the keys, height of the centers = - while it does not make sense at first.</FONT></SPAN></DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2>I concur to say that the leading of the keys is not the way the action can = be lightened, or make heavier, it is quite simple to experiment with leads = using double sided tape and normal cylindrical leads, you can experiment on = many kind of setups.</FONT></SPAN></DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2>I believe that the action mass may match the pianists hand weight so to be = comfortable, finding the way to express those parameters in numbers = should certainly be useful.</FONT></SPAN></DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2>Best Regards.</FONT></SPAN></DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2>Isaac OLEG</FONT></SPAN></DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><SPAN class=898455110-21122003><FONT face=Arial color=#0000ff = size=2></FONT></SPAN> </DIV> <DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV> <STYLE>  </STYLE> <TABLE cellSpacing=0 cellPadding=0 width=600 border=0> <TBODY> <TR> <TD> <TABLE height=80 cellSpacing=0 cellPadding=0 width=600 = align=right border=0> <TBODY> <TR> <TD class=tiny> <TABLE style="BORDER-RIGHT: #666666 1px solid; BORDER-TOP: = #666666 1px solid; BORDER-LEFT: #666666 1px solid; BORDER-BOTTOM: = #666666 1px solid" height="100%" cellSpacing=0 width=600> <TBODY> <TR bgColor=#ffffff> <TD class=tiny width="100%" height=1> <TABLE cellSpacing=0 cellPadding=1 width="100%" = border=0> <TBODY> <TR> <TD class=logotext style="PADDING-LEFT: = 5px"></TD> <TD class=noro style="PADDING-RIGHT: 5px; = FONT-SIZE: 7pt" = align=right>Pianotech</TD></TR></TBODY></TABLE></TD> <TD class=tiny><FONT face=Arial color=#0000ff size=2></FONT></TD></TR> <TR> <TD colSpan=2> <TABLE height="100%" cellSpacing=2 width="100%" = align=right border=0> <TBODY> <TR style="PADDING-BOTTOM: 4px" height=1> <TD class=noro style="PADDING-LEFT: 4px" vAlign=top><B>Isaac OLEG</B><BR><I>accordeur - = reparateur - concert</I> </TD> <TD class=noro style="PADDING-RIGHT: 4px" = vAlign=top align=right>19 rue Jules Ferry<BR>94400 VITRY = sur SEINE </TD></TR> <TR height=1> <TD class=noro style="PADDING-LEFT: 4px; PADDING-BOTTOM: 4px" vAlign=bottom><A class=psl = href="mailto:oleg-i@noos.fr" target=_blank>oleg-i@noos.fr</A> </TD> <TD class=noro style="PADDING-RIGHT: 4px; PADDING-BOTTOM: 4px" vAlign=bottom align=right> <TABLE cellSpacing=0 align=right border=0> <TBODY> <TR> <TD class=noro noWrap align=right>tel: = <BR>fax: <BR>mobile: </TD> <TD class=noro style="PADDING-LEFT: 4px" = noWrap align=right>033 01 47 18 06 98<BR>33 01 47 = 18 06 90<BR>033 06 60 42 58 77 = </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR></TBODY></T= ABLE></TD> <TD></TD></TR></TBODY></TABLE></TD></TR> <TR> <TD class=tiny colSpan=2> <TABLE cellSpacing=0 cellPadding=0 width="100%"> <TBODY> <TR> <TD align=left><A class=brand = href="http://www.plaxo.com/signature" target=_blank><I>Powered by Plaxo</I></A></TD> <TD align=right><A class=brand = href="http://www.plaxo.com/signature" target=_blank><I>Want a signature like this?</I></A></TD></TR></TBODY></TABLE></TD></TR> <TR> <TD align=middle colSpan=2><A class=brand = href="https://www.plaxo.com/add_me?u=12885059450&v0=310641&= k0=119568798" target=_blank><I>Add me to your address book...</I></A></TD></TR></TBODY></TABLE> <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> = caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]<B>De la part de</B> madelyn mrykalo<BR><B>Envoyé :</B> dimanche 21 décembre = 2003 03:10<BR><B>À :</B> College and University Technicians<BR><B>Objet :</B> Re: Touch = Weight<BR><BR></FONT></DIV> <DIV> <DIV><B><I>James Ellis <claviers@nxs.net></I></B> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px = solid"> <P><BR><BR>Touch weight and inertia are NOT the same thing at all. = "Tough weight" is<BR>merely a measure of static force. "Inertia" is a = dynamic quantity.<BR></P> <P><EM>Neither is front weight the same thing as moment of inertia, = which I have already said.</EM></P> <P><EM></EM><BR>That's why putting more leads closer to the center = of the keys<BR>will result in less "KEY" inertia. You will have to use more = lead, but the<BR>"key" inertia will be a little bit less. However, the = keys are NOT where<BR>most of the total action inertia comes from. It comes = from the hammer<BR>heads out on the ends of the shanks, because that's where = the (mass x<BR>velocity squared) is concentrated.<BR><BR>All I'm saying = is that moving the leads closer to the centers of the keys<BR>is not going = to buy you very much, because that's not where most of the<BR>total action = inertia is coming from in the first place.</P> <P><EM>But then that is the only place we <STRONG>can</STRONG> = change the moment of inertia, unless we lighten the hammer.</EM></P> <P>What it will do is<BR>weaken the keys, especially if you drill = more holes, plug holes, etc.</P> <P><EM>That's probably not going to be a = problem</EM>.<BR><BR><BR>Those two things are about all it will do for you, other than just = making<BR>the keys heavier in the middle. So, before you haul off and re-do a = whole<BR>set of keys, drilling more holes, adding more leads, plugging holes, = and<BR>moving all the leads closer to the center, remember: It won't buy you = very<BR>much towarding lowering the overall action inertia, because that's = not<BR>where it's coming from, but it will definitely weaken the keys.</P> <P><EM>If we are going to change the front weight anyway, because we = are also changing out hammers, the MOI might as well be dealt with then too.<BR></EM><BR>Merry Christmas, Jim = Ellis<BR><BR><BR>_______________________________________________<BR>caut = list info: = https://www.moypiano.com/resources/#archives</P></BLOCKQUOTE></DIV></DIV><BR>= <BR>Vince Mrykalo<BR>University of Utah <P> <HR SIZE=1> Do you Yahoo!?<BR><A = href="http://pa.yahoo.com/*http://us.rd.yahoo.com/evt=21260/*http://p= hotos.yahoo.com">New Yahoo! Photos - easier uploading and = sharing</A></BLOCKQUOTE></BODY></HTML>