At 23:02 -0600 23/11/08, Ron Nossaman wrote: >Without measurements, how do you calculate the elongation to >determine where the wrap ends under tension, in relation to the >bridge pin, and especially the agraffe? Are you serious?! The rubbing contains the lengths, the pattern strings (first and last of each section) test the accuracy of the rubbing, and the computer programme knows how much a given string will stretch under tension. As to the lengths for the calcs, for curved bridges it's only necessary to measure every fifth speaking length (two minutes' work on the bench), for straight bridges only two measurements are needed; the computer interpolates the rest, and that's supposing that after 24 years of keeping computerised string scales I am sent a piano that I haven't done before. JD
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