This is a multipart message in MIME format ---------------------- multipart/alternative attachment Go Ron! David Ilvedson Original message From: Overs Pianos To: Pianotech Received: Thu, 18 Aug 2005 06:55:09 +1000 Subject: Re: the magic line Quentin, Does anybody have a picture or drawing showing the "magic line"= in the action, going from the capstan, I think? Andre Oorebeek told me about that yesterday but I would really= like to see a drawing of it. 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. http://overspianos.com.au/actn.html 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. 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. 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. Ron O. -- OVERS PIANOS - SYDNEY Grand Piano Manufacturers _______________________ Web http://overspianos.com.au mailto:ron@overspianos.com.au _______________________ ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/19/62/4e/7a/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC