<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1400" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Key Ratio.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Terry Farrell</FONT></DIV> <BLOCKQUOTE dir=ltr 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=quentin.codevelle@tiscali.fr href="mailto:quentin.codevelle@tiscali.fr">Quentin Codevelle</A> = </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, December 15, = 2004 3:21 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> grand action = problem</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial>Hi Jon,</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>could you explain to those whose native = language is not english what KR is?</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>Thanks,</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV> <DIV><FONT face=Arial>Quentin</FONT></DIV> <DIV><FONT face=Arial><EM></EM></FONT> </DIV> <DIV><FONT face=Arial><EM></EM></FONT> </DIV> <DIV><FONT face=Arial><EM></EM></FONT> </DIV> <DIV><FONT face=Arial><EM>Jon page wrote:</EM></FONT></DIV> <DIV><FONT face=Arial><EM></EM></FONT> </DIV> <DIV><FONT face=Arial><EM>Start with routine = measurements:<BR><BR>String height for each section<BR>Hammer center height on #'s 1 & 88<BR><BR>(String height) - (hammer center height) = Bore = Distance<BR><BR>This will let you know if the hammers are too short.  Look at the = string <BR>impressions in the crown, are they fairly centered?<BR>Are the = knuckles flattened out?  Bolstering them will get your L/O = closer.<BR><BR>Action spread should be probably somewhere between 112.5 mm & 113.5 mm. = <BR>Blow distance 46mm. Key Dip 10mm.<BR><BR>  As Ric mentioned, bed the = key frame. Recheck action parameters.<BR><BR>Is there superfluous after = touch now, because if it is minimal then <BR>bringing the L/O up will decrease that.<BR>In other words, if the jack is far away from the knuckle when = the key is <BR>fully depressed then there is<BR>tolerance for the L/O to = raise. If the jack is in very close proximity to <BR>the knuckle then you have to = deal with<BR>action measurements or KR.<BR><BR>Have you taken touchweight measurements?  If they are low (light touch) I <BR>would suspect KR.<BR><BR>Best of Luck,<BR><BR>Regards,<BR><BR>Jon Page, piano technician<BR>Harwich Port, Cape Cod, Mass.<BR>mailto:</EM><A = href="mailto:jonpage@comcast.net"><EM>jonpage@comcast.net</EM></A><BR><= EM>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <BR></DIV></BLOCKQUOTE></EM></FONT></BODY></HTML>