This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment This query goes back to Dale Erwin's comment about a Steinway O for = which the scale had been recalculated by Sanderson with a higher tension = and it ended up choking the board such that the piano had to be restrung = with the original scale. =20 My question is broad and I really just want to open the topic up for = discussion as I'm interested in researching this area and would = appreciate any comments or recommendations for further reading. =20 My impression about Sanderson, perhaps others, is that the priority for = scale calculation is in the area of inharmonicity rather than overall = tension and that this sometimes leads to the case mentioned above. My = basic question is, if in order to get a smooth inharmonicity curve a = higher tension scale is called for, can one simply alter the downbearing = so that the load on the board is roughly the same? (All other things = being equal and assuming the additional tension doesn't create a problem = for the plate). =20 Additionally, is there an optimum load that the board should have in = each section? The other day, Ron N. was discussing the Lowell gauge and = how do calculate the load given various dimensions and tension. I have = also heard Ron and others mention that they aim for a certain number of = degrees of downbearing in different sections of the piano. But wouldn't = the optimum number of degrees vary with the overall tension? And since = there seems to be disagreement about the criteria for choices about = tension levels what are the important criteria? Since creating a = smooth inharmonicity curve seems like a reasonable goal (that the piano = should tune well), how can one approach rescaling a piano (where it's = called for) and maintain an optimum load on the board? Do all of you = who get involved in soundboard and bridge design actually calculate the = load on the board in terms of pounds in each section or overall? If so, = what do you aim for? Or do you just kind of wing it using basic rules = of thumb (quarter, nickel, dime etc...)? David Love ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/97/65/59/db/attachment.htm ---------------------- multipart/alternative attachment--
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