This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Dear List- This discussion of MOI in piano actions has been one of the great = moments on this list. Throughout this discussion I have been trying to find an answer to the = question "How can I tell if it matters enough to do something about it?" = and "Is there a point of diminishing return where we should stop = worrying about key lead placement?" As practicing piano technicians, = this is the question we are all seeking to answer. The act of playing a piano is so complex, the demands are so varied, and = the techniques, sizes and shapes of people who do the playing are so = varied, that while analysis of the physics of the action give us = insight, I don't believe it can give final answers. Ultimately the answers will have to come from empirical performance = tests using real musicians. I have been trying to think of some way to test this that doesn't = require an immense budget and research lab, since I have neither!. So I've done various thought experiments, looking for something = feasible. Here's the best I can imagine so far. I would appreciate critical = comments: 1) Start with a piano with a well designed and regulated action. It = should have strikeweight and frontweight continuities, even balance = weight and friction as low and even as possible, and presumably wippen = assist springs. The keyleading should be as consistent from key to key = as possible. 2) Add extra key leads to certain keys. Add these leads in pairs = equidistant from the balance pin hole, one lead to the front, one to the = back. In this way the measured parameters of frontweight and = balanceweight should not change, but the MOI of various adjacent keys = would be very different. If, for example, one large lead is added, = front and back at 8" from the balance pin hole, the relative MOI = difference between keys will become greater from bass to high treble. =20 3) Have pianists play the piano and report on what they feel and how it = influences their playing. Compare their reports with actual locations = of extra lead.=20 Thanks for your comments. Ed Sutton ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/77/12/61/a2/attachment.htm ---------------------- multipart/alternative attachment--
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