---------------------- multipart/alternative attachment Terry Is that a Weber grand? What does the bathroom scale say the psi per go bar is 100 lbs or so?I'd be interested as to how much precompression your board is showing in this condition. You can measure it in mm at the three treble plate struts before & after stressing I'll bet I know what it is. Dale David M. Porritt wrote: While you have an unstrung board is it possible to put weights on the bridge approximating the downbearing load you expect to have then reexamine the crown and bearing angles? Would this give an elementary idea of the board's ability to sustain that load? Yes indeed. I consider that to be an integral step to setting up a new soundboard. I use go-bars to apply down-force to the bridges (see the picture below). I calibrate the go-bars by measuring the go-bar pressure with a scale (see second picture - my wife keeps bugging me: "Terry, where is the bathroom scale?"). I suspect that after one has built and set up many, many soundboards, this step may not be necessary. But I find a tremendous educational dimension to the process. Terry Farrell ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/58/22/63/71/attachment.htm ---------------------- multipart/alternative attachment--
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