----- Original Message ----- From: Ken & Pat Gerler To: Ed Sutton ; pianotech at ptg.org Sent: Tuesday, July 07, 2009 9:19 AM Subject: Re: [pianotech] Interesting action on Yamaha YUA I watched the video clip on youtube and it looks like the hammer is acting like there is a repetition lever action of a grand in the operation. Did/does the hammer spring pull the hammer forward? Ken Gerler Ken, I think what is happening is that the butt loses contact with the spring before the jack fully returns. The Rep lever like movement of the hammer is from the jack sliding back under the butt.Since there is no " Push" back to the hammer when it leaves the spring the returning jack moves the butt-hammer assembly forward. Back in the 70's @ convention Steve Jellen demonstrated this on a conventional vertical action with a strong jack spring and a very weak hammer return spring. The jack overpowers the returning butt assembly and the hammer moves toward the string as the key is returning to rest.Anyway I think that is what's going on . Best wishes, Tom Driscoll -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090707/140c4d06/attachment.htm> -------------- next part -------------- No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 8.5.386 / Virus Database: 270.13.7/2222 - Release Date: 07/07/09 05:53:00
This PTG archive page provided courtesy of Moy Piano Service, LLC