<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML xmlns:o = "urn:schemas-microsoft-com:office:office"><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Vince-</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Wow!  Easy to calculate.  (I = thought it was one of those progressions to the infinitesimal = formulas.)</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>This gets exactly to the unanswered = question when setting front weights, i.e. one in front or two in the back? = etc.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>In fact it should be fairly easy to = make a reference chart in, say half inch increments.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I'm rebuilding an action after Xmas, = and I just might knock out the old weights, plug the holes and go for = broke.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Thanks very much!  This is a real = Xmas present!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Ed Sutton</FONT></DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=madvinmryk@yahoo.com = href="mailto:madvinmryk@yahoo.com">madelyn mrykalo</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=caut@ptg.org href="mailto:caut@ptg.org">College and University Technicians</A> = </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, December 19, 2003 = 8:47 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Touch weight</DIV> <DIV><BR></DIV> <DIV>Ed-</DIV> <DIV>We measured the weight in grams of a lead for the mass (m).  I.e. 14.1 grams for a 1/2 inch lead is usual, then for r we = measured the distance of the lead from the middle of the balance hole = to the middle of the lead in inches.  So I=14.1X4"  would be for = one lead (I just picked a figure 4" for the distance).  Then if there is = another lead, do the same for it, adding it to the first lead.  So I=14.1X4" + 14.1X2" (if the second lead is 2" from balance) and = so  on.  This gets some figure that sort of arbitrarily represents = the moment of inertia, larger in the bass, and graduating to smaller as we go up = into the treble.  I think with some research the moment of inertia figure = can come to mean something to us.  Empirically finding out what kind of = figures pianists like would help set a general standard, I think.</DIV> <DIV> </DIV> <DIV>It seems to me right now if you can get those figures to graduate = smoothly you can really even out the feel.  Another question = arises as to should we smooth out those figures between the sharps and naturals or = let the sharps have a "lighter" number as they naturally do, because of their = shorter length.</DIV> <DIV><BR><B><I>Ed Sutton <ed440@mindspring.com></I></B> = wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px = solid"> <META content="MSHTML 6.00.2600.0" name=GENERATOR> <STYLE></STYLE> <DIV><FONT face=Arial size=2>Vince-</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Never having learned calculus, I = don't know how to work a formula like this.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Assuming that I have</FONT></DIV> <DIV><FONT face=Arial size=2>-Strikeweight continuity within = Stanwood's suggested range</FONT></DIV> <DIV><FONT face=Arial size=2>-Frontweight continuity within = Stanwood's ceiling</FONT></DIV> <DIV><FONT face=Arial size=2>-Even and acceptable DW & = UW</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>How can I use this formula to = improve action performance?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Thanks!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Ed Sutton</FONT></DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- = </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=madvinmryk@yahoo.com = href="mailto:madvinmryk@yahoo.com">madelyn mrykalo</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=caut@ptg.org = href="mailto:caut@ptg.org">College and University = Technicians</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, December 19, = 2003 12:56 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Touch = weight</DIV> <DIV><BR></DIV> <DIV> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: = Arial">Hi-<o:p></o:p></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Of course you can = have acceptable DW's & UW's and at the same time have a wide range = of moments of inertia, some which may be acceptable and some which = may not be.  Or the front weights could be too high.<SPAN style="mso-spacerun: yes">  </SPAN>That's why I don't think = UW/DW alone tells us enough about how the action = "feels". </SPAN><SPAN style="FONT-FAMILY: Arial"><FONT size=3> <o:p></o:p></FONT></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-FAMILY: Arial"><o:p><FONT size=3> </FONT></o:p></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Here is a formula = for moment of inertia</SPAN><SPAN style="FONT-FAMILY: Arial"><FONT = size=3> (I):<o:p></o:p></FONT></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT = size=3><SPAN style="FONT-FAMILY: Arial; mso-bidi-font-family: 'Times New = Roman'"><SPAN style="mso-spacerun: yes"> </SPAN>I= m<SUB>1</SUB>r<SUB>1</SUB><SUP>2</SUP> + m<SUB>2</SUB>r<SUB>2</SUB><SUP>2</SUP> + m<SUB>3</SUB>r<SUB>3</SUB><SUP>2</SUP> + ... + m<SUB>n</SUB>r<SUB>n</SUB><SUP>2<SPAN style="mso-spacerun: yes">   </SPAN></SUP></SPAN><SPAN = style="FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: = Arial"><o:p> </o:p></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Where m is the mass = and r (radius) is the distance that the mass is from the balance hole of = the key.<SPAN style="mso-spacerun: yes">  </SPAN>The key itself = has some moment of inertia too.<o:p></o:p></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: = Arial"><o:p> </o:p></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">So the action in = question (Wim�s D) might weigh off acceptably (DW and UW), but also may = have a too heavy a front weight, and/or moment of = inertia.<o:p></o:p></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: = Arial"><o:p> </o:p></SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Stanwood has come up = with a good standard of front weights.<SPAN style="mso-spacerun: = yes">  </SPAN>Moment of inertia standards are a little more ambiguous at = this point. More importantly is that the moments be reasonably smooth = from key to key.</SPAN></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: = Arial"></SPAN> </P></DIV></BLOCKQUOTE></BLOCKQUOTE><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>