<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Re: the magic line</title></head><body> <div>Quentin,</div> <div><br></div> <blockquote type="cite" 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 type="cite" cite> </blockquote> <blockquote type="cite" 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" size="-3" color="#000000">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" size="+1" color="#0000FF"><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 size="-2" color="#000000"><br> </font><font color="#000000">Web http://overspianos.com.au</font></div> <div><font color="#000000">mailto:ron@overspianos.com.au<br> _______________________</font></div> </body> </html>