<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" = http-equiv=Content-Type> <META content="MSHTML 5.00.2919.6307" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#d8d0c8> <DIV> </DIV> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: = 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A href="mailto:Piannaman@aol.com" title=Piannaman@aol.com>Piannaman@aol.com</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = href="mailto:pianotech@ptg.org" title=pianotech@ptg.org>pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, April 28, 2003 = 6:52 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: hammer = velocity</DIV> <DIV><BR></DIV> <DIV><FONT face=arial,helvetica><FONT size=2>Joe, <BR><BR>If you = figure the jack is pushing on the knuckle, it would be causing the shank to bend backwards(downward).  When let-off occurs, I'd think that the = hammer head would then catch up with the rest of the shank.... <BR><BR>I'm just = suggesting this as a possibility.  I claim no extensive knowledge of = physics..... <BR><BR>Dave <BR><BR></FONT></FONT></DIV></BLOCKQUOTE> <DIV><FONT size=2>Sigh. It's back to the Journal again. Only at = pianissmo is there a direct relationship between the motion of the key end and the = hammer. Since this is typically what we see at the regulating bench we make the asumption that this is what occurs in the piano under normal play. In = fact as one approaches forte the key motion precedes that of the hammer by an = increasing amount. Indeed, in a typical "modern" concert grand the keys in the bass = up through the mid-range will have fully bottomed somewhat before the = hammer begins to move. From that point on energy is moving through the system and is = being delayed by the compression and flexing of the various action components. = At this point there is no longer any hope for subtlty.</FONT></DIV> <DIV> </DIV> <DIV><FONT size=2>Del</FONT></DIV> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: = 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV><FONT face=arial,helvetica><FONT = size=2> </DIV></FONT></FONT> <DIV><FONT face=arial,helvetica><FONT size=2> </DIV></FONT></BLOCKQUOTE></FONT></BODY></HTML>