Richard, What I wanted to say with my comments was that we can count to professional physicians , or engineers (or books) for the definition part of the things, the formulas, the explanations on what it is related in theory. And we can count on the tech experience on the other way to explain what he gets with the use of this or that method. We also can get feedback from the pianists/technicians on how they perceive this of this method of balancing (while it is very difficult to explain what is felt while playing) So any approach is valuable but link between them is probably too difficult to obtain, apples and oranges, because basically we are acting differently from the start. The mathematic description of the piano action may be terribly complicated, and even when obtained will it be of much use ? I cant imagine how piano technicians can have measuring equipment like in laboratories, speedometers, accelerometers, and have significant repeatable results using them. If it is possible to make a cheap accelerometer to check i.e.. of glued hammers indeed the results should be interesting, then we can check different mass placement, and results, but as Jim said in the end we deal with so many differences in material rigidity, mass, shape, from one note to the other, that I can't imagine how useful these should be in the field. Very few people seem to be able to cover the theory and the practical part of the trade. And on the other hand being reminded of the more traditional way of thinking, meaning woodworking and traditional tricks , is always refreshing. Not to say I is not very valuable to us to obtain a better understanding of the basic concepts we have to deal with, but after that, the practical of the thing will be the most difficult part to generate. Then for instance the key flex check method shared with us by John Harman (with a 1Kg weight) is a very good practical approach to other while difficult to compute facts, if some similar method should be appropriate for a crude dealing of acceleration resistance (torque) this should be wonderful, but dynamics are soo complicated I am not very confident on that part. Then, I appreciate a lot of course your curiosity and willingness to understand what it is about (and the way you write it <G>. Best of the best and good day . Isaac ------------------------------------ Isaac OLEG accordeur - reparateur - concert oleg-i@noos.fr 19 rue Jules Ferry 94400 VITRY sur SEINE tel: 033 01 47 18 06 98 fax: 33 01 47 18 06 90 mobile: 033 06 60 42 58 77 ------------------------------------ >
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