<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.2900.2963" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2>Aftertouch, of course is the amount the key moves after the jack clears the knuckle. If it moves too much, the jack will compress the stop felt and may contribute to some sponginess. Adjust your blow distance, letoff and dip to get the right clearance on the knuckle. Once you do that, then there are some other things that contribute to what you are feeling in aftertouch. One of them is hammer drop. For really nice after touch you want minimal drop (I learned this from watching a Shigeru tech do a prep). I use the PianoTech regulating jig. After setting let off, I raise the drop until the hammer just comes off that jig's rail, then bring it back down just a little more than the rest position. </FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2>Make sure repitition spring is not too stiff. </FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2>Poor key frame set up can also adversely affect aftertouch. If the balance mortises are not drilled deeply enough, the balance holes will bind on the pin causing a spongy feeling.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2>Having the damper stop rail set too low can also cause a spongy feeling at the bottom of key dip. You are trying to force the damper up higher than the stop rail will allow. </FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2>Blessings,</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=828254123-04112006><FONT face=Arial color=#0000ff size=2>Dean</FONT></SPAN></DIV><BR> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left> <HR tabIndex=-1> <FONT face=Tahoma size=2><B>From:</B> pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <B>On Behalf Of </B>J W Stein<BR><B>Sent:</B> Saturday, November 04, 2006 3:42 PM<BR><B>To:</B> Pianotech List<BR><B>Subject:</B> Aftertouch<BR></FONT><BR></DIV> <DIV></DIV> <DIV><FONT face=Arial size=2>Hi Folks,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Here is a question regarding regulation of aftertouch when depressing keys.  When regulation actions, I like to break key movement into eighths.  I figure that most normal key depths are 3/8 inches.  Thus, the first 2/8 of movement is smooth..then there is that last 1/8 if aftertouch.  I like to feel the slight hesistion (clicking feel).  However, there are times when that aftertouch feels too spongy regardless of what I do....jack regulations, drop, let off, etc....   About the only thing that seems to help is a slight increase of depth....but why would most keys have the "normal" feel of aftertouch, while a few are unresponsive...?????</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Any ideas?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Jon</FONT></DIV> <DIV> </DIV></BODY></HTML>