<!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> <STYLE></STYLE> </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>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> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Brian is = right.</SPAN></P></DIV> <DIV><B><I></I></B> </DIV> <DIV><B><I>Brian Lawson <lawsonic@bdmail.co.za></I></B> = wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px = solid">Hi, I think he is referring to the English language with use of a = virgule and<BR>not a division sign<BR><BR>3 : a mark / used typically to = denote "or" (as in and/or), "and or" (as in<BR>straggler/deserter), or "per" (as = in feet/second) -- called also slash, solidus,<BR>virgule<BR><BR>Brian<BR><BR><BR><BR>----- Original = Message -----<BR>From: "Richard Brekne" <RICHARD.BREKNE@GRIEG.UIB.NO><BR>To: = "College and University Technicians" <CAUT@PTG.ORG><BR>Sent: = Thursday, December 18, 2003 3:29 PM<BR>Subject: Re: Touch weight<BR><BR><BR><BR><BR>madelyn mrykalo wrote:<BR><BR>> HI-More = telling than downweight/upweight is moment of inertia/front<BR>> weight = (which are two different things). UW/DW will not, in and of<BR>> itself, = tell much of anything about the action's feel.<BR>><BR><BR>I think you = want to explain this a bit further for us. How exactly are<BR>you ariving at = ! the moment of inertia (for the key) and what does<BR>dividing that by FW = tell us exactly ?<BR><BR>Cheers<BR>RicB<BR><BR></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>