At 11:49 PM 3/16/96 -0700, you wrote: >>String breakage incidence goes up with the amount of overpull. The reason >>overpull and resultant string breakage is higher when starting in the middle >>is that this is the center of the board and will deflect further during the >>pr than any other portion of the board. Starting at A1 and progressing >>sequentially to C88 loads the board from the edge (which doesn't deflect as >>much with a given load) to the center (which has already been forced down >>somewhat by the already tensioned strings). The result is that the overpull >>is less and string breakage goes down accordingly. From the center out, the >>soundboard acts like a class two lever, for instance a wheelborrow. In this >>analogy, the rim is the wheel, the center is where you grab the handle, and >>the load goes in between. My guess is that the results of an "edge first, >>center last" pitchraise procedure would be even better if you were to >>alternate from both ends and work toward the center tuning the unisons as >>you go. It would be pretty slow, but if any of you digitoids out there in >>electronicland have ever tried, or would care to try it, I'd be curious to >>know how it works. I'd try it myself, but I don't have access to the >>hardware (it's tough to do with a fork <G>). >> >That is a real interesting analogy, will have to think on that one. It >sounds like a fascinating experiment too. Seems like a good way to do it >would be with two (human) tuners with two Accu-Tuners starting at each >end. Sounds like fun. If nothing else, the piano would get raised twice >as fast! ;-) Come on Dean, where are you going to find two tuners who are willing to meet in the middle? <MAJOR grin> Gotcha! Ron Nossaman
This PTG archive page provided courtesy of Moy Piano Service, LLC