<HTML><HEAD><TITLE>Re: the magic line</TITLE> <STYLE type=text/css></STYLE> </HEAD> <BODY>Go Ron!<BR><BR>David Ilvedson<BR><BR><BR><BR><BR> <DIV style="PADDING-RIGHT: 5px; PADDING-LEFT: 5px;= PADDING-BOTTOM: 5px; BORDER-LEFT: #000000 3px solid;= PADDING-TOP: 5px"> <HR> Original message<BR>From: Overs Pianos= <SEC@OVERSPIANOS.COM.AU><BR>To: Pianotech= <PIANOTECH@PTG.ORG><BR>Received: Thu, 18 Aug 2005 06:55:09= +1000<BR>Subject: Re: the magic line<BR><BR> <DIV align=left>Quentin,</DIV> <DIV><BR></DIV> <BLOCKQUOTE cite="" type="cite"><FONT face=Arial size=-1>Does= anybody have a picture or drawing showing the "magic line" in= the action, going from the capstan, I= think?</FONT></BLOCKQUOTE> <BLOCKQUOTE cite="" type="cite"> </BLOCKQUOTE> <BLOCKQUOTE cite="" type="cite"><FONT face=Arial size=-1>Andre= Oorebeek told me about that yesterday but I would really like to= see a drawing of it.</FONT></BLOCKQUOTE> <DIV><BR></DIV> <DIV>If you look at my introductory web page on the Overs action,= you will find two drawings of our action, shown at rest and in= the check position.</DIV> <DIV><BR></DIV> <DIV><FONT face="Lucida Grande" color=#000000= size=-3>http://overspianos.com.au/actn.html</FONT></DIV> <DIV><BR></DIV> <DIV>The two magic lines which Terry mentioned are shown on both= drawings. You will notice that with our action the contact= points between the capstan/wippen heel and the roller/jack pass= through the line of centres at half key dip.</DIV> <DIV><BR></DIV> <DIV>The drawing which shows the action in the check position has= a third magic line drawn - the magic line between the repetition= lever centre and the hammer centre. In the Overs action the= contact between the repetition lever and the roller sits on this= magic line when the hammer goes into check. In a conventionally= laid contemporary action this contact is way off line. This is a= minor point perhaps, but it allows the repetition lever spring= to work as intended with the a lot less tension. We've done= tests with a 10.5 gram bass hammer with our action and an= S&S model. The repetition lever loading on the roller at= check was around 80 grams for the S&S and around 60 grams= with our action. With our action, the hammer goes into check,= even when the action is played very softly. When regulating, we= have to be quite slow in rising the hammer to view the drop= position, to prevent the hammers from falling back into= check.</DIV> <DIV><BR></DIV> <DIV>I'm currently fitting an Overs action to another= manufacturer's 225 grand piano. There will be an AB comparison= with two otherwise identical pianos from this manufacturer at an= Australian music trade convention in September. One piano will= have a Renner action and the other will have an Overs action.= Company representatives from the piano manufacturer, who has= expressed an interest in using our action under licence, will be= coming to the convention to view the comparison.</DIV> <DIV><BR></DIV> <DIV>Ron O.</DIV><X-SIGSEP><PRE>-- </PRE></X-SIGSEP> <DIV><FONT face="Times New Roman" color=#0000ff size=+1><B>OVERS= PIANOS - SYDNEY</B></FONT></DIV> <DIV><FONT color=#000000><I>   </I></FONT><FONT= color=#0000ff><I>Grand Piano Manufacturers</I></FONT><FONT= color=#000000><BR>_______________________</FONT></DIV> <DIV><FONT color=#000000 size=-2><BR></FONT><FONT= color=#000000>Web http://overspianos.com.au</FONT></DIV> <DIV><FONT= color=#000000>mailto:ron@overspianos.com.au<BR>_________________= ______</FONT></DIV></DIV></BODY></HTML>