Roger, Just to keep the record straight, :-) it was John McKone who asked the original question. I was basically recommending that he use metric instead of American wire to restring a Yamaha because of those differences. >Hi Avery, > As an example #15 metric is .001" thinner than the American #15, >this translates to a reduction of approximately 10lbs per string. Typically >this will reduce overall tension by 3/4 of a ton. I'd be curious to know how much difference it would make in loading on the soundboard to use American instead of metric. Anyone have the information already? Or the time and "equipment" to figure it out? What about the reverse? Using metric on an American piano, such as Steinway? Any ideas? Avery >At 11:15 AM 27/07/98 -0500, you wrote: >>John, >> >> For a piano of that size & quality, I think I'd go ahead and "bite the >>bullet" and order some metric wire from Mapes or somewhere. :-) You're >>probably going to run into a lot of metric wire pianos out there anyway. >> I just got 12 coils of Mapes best American wire ($67.80) and 12 >>cannisters for a total of $93.60 plus freight. I'm sure the metric would be >>comparable. I bought mine several years ago after I restrung the top two >>sections of our Hamburg 'D' with American wire before it occurred to me >>that it was metric. :-( I always have learned my lessons the hard way. >> The metric wire is designated with the same numbers as the American. >>That's what your numbers on the bridge are. But the sizes are not exactly >>the same for identical numbers. >> I'm not a scaling expert, but my guess is that if you're going to change >>to American wire, you probably ought to measure the speaking lengths and >>have someone rescale it. I don't know how much overall difference it will >>make, but there *are* some differences in the sizes. >> Below is a chart of the dimensions that Ray Chandler once did for Kawai. >>Hope it helps. >> >>Avery >>>I am restringing a Yamaha C7 and dont' have the original strings avaible to >>>mic sizes. >>> >>>The bridge is marked or string gauges, but I seem to recall that the Yamaha >>>gauges are metric and slighty different than American (i.e. a #15 isn't >>>always a #15) >>> >>>Is this true? If so could someone be so kind as to give me a conversion or >>>expaination of the marked brige numbers? >>> >>>Thanks in advance (as always) >>> >>> >>>John McKone, RPT >>>St. louis Park, Minnesota >>>(612) 280-8375 >>>mckonejw@skypoint.com >> >> >>METRIC DIAMETER NEAREST US # DIAMETER >>13 .0305 13 .0310 >>13.5 .0315 13.5 .0320 >>14 .0325 13.5 .0320 >>14.5 .0335 14 .0330 >>15 .0344 14.5 .0340 >>15.5 .0354 15 .0350 >>16 .0364 15.5 .0360 >>16.5 .0374 16 .0370 >>17 .0384 16.5 .0380 >>17.5 .0394 17 .0390 >>18 .0404 17.5 .0400 >>18.5 .0413 18 .0410 >>19 .0423 18.5 .0420 >>19.5 .0433 19 .0430 >>20 .0443 19.5 .0440 >>21 .0463 20.5 .0460 >>22 .0482 21.5 .0480 >>23 .0512 23 .0510 >>24 .0551 24 .0550 >>25 .0591 25 .0590 >Roger Jolly
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