<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40"> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)">  <title>Light fixtures</title> <style>  </style>  </head> <body bgcolor=white lang=EN-US link=blue vlink=purple> <div class=Section1> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'>Terry:<o:p></o:p></span></font></p> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'><o:p> </o:p></span></font></p> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'>I played a Steinway B once that David Stanwood had redone and he had moved the capstans 0.400” of an inch which would be 10.16mm.  It really played nice.  He did have to move the wippen heels also.<o:p></o:p></span></font></p> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'><o:p> </o:p></span></font></p> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'>dp<o:p></o:p></span></font></p> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'><o:p> </o:p></span></font></p> <div> <p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size: 10.0pt'>David M. Porritt</span></font><o:p></o:p></p> <p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size: 10.0pt'><a href="mailto:dporritt@smu.edu">dporritt@smu.edu</a></span></font><o:p></o:p></p> </div> <div> <div class=MsoNormal align=center style='text-align:center'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> <hr size=2 width="100%" align=center tabindex=-1> </span></font></div> <p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt; font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <b><span style='font-weight:bold'>On Behalf Of </span></b>Farrell<br> <b><span style='font-weight:bold'>Sent:</span></b> Monday, July 17, 2006 5:03 PM<br> <b><span style='font-weight:bold'>To:</span></b> pianotech@ptg.org<br> <b><span style='font-weight:bold'>Subject:</span></b> 1890s WNG Action Geometry</span></font><o:p></o:p></p> </div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'><o:p> </o:p></span></font></p> <div> <p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt; font-family:Arial'>Phil Bondi and I dove into an 1890s WNG action from a 6' 4" Knabe today to try and straighten out some basic action geometry. We haven't got all the kinks worked out yet, but we seem to be getting there. With only a large capstan move and removal of a couple leads, we went from an action ratio of over 6.0 down to 4.9. DWs went from 60+ to 50 and less (I know, too light) and BW in the 36 to 40g range. We have a lot of work to do yet, but it seems the capstan move described below has gotten us into the right ball park anyway.</span></font><o:p></o:p></p> </div> <div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt; font-family:Arial'>Most notable was a very large capstan move that we will likely keep (unless someone so kindly informs us of a potential problem the change might induce). The photo below shows the original capstan in the background. The forward key had its capstan moved 10mm forward and 11mm lower. The middle key had its capstan moved 13mm forward and 12mm lower. The second photo shows the modified wippen heel. These lower positions put the capstan right on the magic line at half blow. The capstan/wippen heel interface went from a traveling, grinding, sliding affair and a note with 17g friction to a perfectly interfacing union with no apparent sliding and a note with 9g friction. We were amazed at the improvement in friction and interface movement.</span></font><o:p></o:p></p> </div> <div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt; font-family:Arial'>This strikes me as a rather drastic capstan move. Has anyone else run across an action that needed such a large capstan move? As our action ratio is down to 4.9 and key ratio is down around 4.8 with the 10mm forward capstan migration, we may move it back just a few millimeters. But still it seems large. Is there some hidden pitfall I'm not seeing? Comments?</span></font><o:p></o:p></p> </div> <div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt; font-family:Arial'>Terry Farrell</span></font><o:p></o:p></p> </div> <div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'><img border=0 width=568 height=426 id="_x0000_i1025" src="cid:image001.jpg@01C6A9CC.D368EF90" align=baseline><o:p></o:p></span></font></p> </div> <div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'> <o:p></o:p></span></font></p> </div> <div> <p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size: 12.0pt'><img border=0 width=568 height=426 id="_x0000_i1026" src="cid:image002.jpg@01C6A9CC.D368EF90" align=baseline><o:p></o:p></span></font></p> </div> </div> </body> </html>