These numbers sound reasonable to me. But I wonder if the some standards for inertia also need to be specified? Phil F At 06:41 PM 4/28/03 , you wrote: > I'll stick my neck out and say that you could easily establish a standard. >If you could poll all pianists about their likes and dislikes, have them >sit down to a row of mute pianos and just feel the actions, my bet is that >there would be a fairly normal bell shaped curve with a standard deviation >that would bring 95%of the players within a fairly narrow range of balance >weight and regulation specs. Some of the outliers might actually be >personal preference, some might be misperception. Tastes may also have >something to do with what people are used to. Once you've learned to get >what you need out of that 1970's B with more lead than wood in the keys, it >feels normal to you. Over the past couple of years, I have defaulted >almost everything to a narrow range of 34 - 42 balance weight with front >weight maximums in the 85 - 90% range depending on requests of lighter >versus heavier and the particular set of hammers. Regulation specs have >always taken priority and I have not deviated far from 10 mm dip delivered >by a SBR of 5.6 - 5.8. If I had to choose a standard it would be smack in >the middle: 38 balance weight, 5.7 SBR which produces a regulation of 10 >mm dip, front weights below maximums by 10 -15%, and whatever the SW zone >that both fits into all that and is realistically acheivable with the set >of hammers you have. Setting the action up with an adjustable rep spring >to get you that entire range quickly (if you wanted to) would mean that the >rep spring would need to displace an average of 8 grams of FW (lower is >better in my opinion). With a midrange default of 38 BW, to get to 34 BW >you would then have to go up to 12 grams for the rep spring, and for 42 >down to 4 grams leaving you a comfortable margin of error. My guess is >that you would have very few complaints > > David Love > davidlovepianos@earthlink.net >
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