I'm sure he has, and he's not the only one. This topic came up not too long ago and several methods were outlined by various people. If you have keys made by various key makers around the country you will discover that the methods they use can yield quite different numbers which makes communication along these lines difficult at best. An action from one key maker I know targets something around 4.8 as his standard but that same action produced by another keymaker would be considered 5.6. Those differences are all owing to how they measure the individual levers. One of those two must be wrong, it seems to me, or at least have some other meaning. The discussion that came up previously was which method of measuring most closely mirrors the SWR method that comes about from an analysis by weight. I'm sure DS could chime in on that, if he wanted to. Finding a system in which weight and distance methods yield the same numbers under ordinary conditions seems like something important. So far, I find the system that I use (not the hammer travel/key travel number but the individual lever measurements, to be the most consistent in that respect, though it's not perfect. David Love www.davidlovepianos.com From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Dale Erwin Sent: Wednesday, January 16, 2013 6:35 PM To: pianotech at ptg.org Subject: Re: [pianotech] Measuring Action Ratios Perhaps David Stanwood could weigh in on this. No doubt he's experienced this in his massive studies of such things. Dale Erwin R.P.T. Erwin's Piano Restoration Inc. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130116/d1bad76d/attachment.htm>
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