These are formulas used by Nick Gravagne , David Stanwood and others to determine the overall action ratio. Which is a very useful thing to know. Need some Excedrin now Joe? Dale Erwin R.P.T. Erwin's Piano Restoration Inc. Mason & Hamlin/Steinway/U.S. pianos www.Erwinspiano.com Phone: 209-577-8397 -----Original Message----- From: Joseph Garrett <joegarrett at earthlink.net> To: pianotech <pianotech at ptg.org> Sent: Sat, Aug 25, 2012 8:03 am Subject: Re: [pianotech] action ratio David said: "One formula for the action ratio has been given as: Key out x wippen out x shank out = blow distance - let off Key in wippen in shank in key dip - after touch Does anyone happen to know what the standard (or minimum) aftertouch is in this formula or how it was derived? " David, First of all, I need to know what the hell "key out...." and "key in..." means. Have never heard the terms. I suspect if I knew, I'd get a headache Joe Joe Garrett, R.P.T. Captain of the Tool Police Squares R I -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120825/24c95f0d/attachment.htm>
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