---------------------- multipart/alternative attachment Hey Gregg There are no magic formulas just some educated decision making. I.E. a D board is going to get a thicker panel than a M board. And by the way if you had an idea that all Stwy B boards or L boards were the same thickness from the factory , forget about it. I've seen B boards as thin as .320 or as thick as .370. & both sound fine. However .370 for softer /less dense eastern spruce might be fine but with the Sitka .340. is enough. This would be the thickest part of the panel. Also choosing panel thickness depends on how much compression is going into your system. In a purely CC design there must be some thickness/mass to compress. I/E a .300 panel under extreme compression would tend to ridge & split sooner than one that was .340. It's a stregth issue in this case.. However if you are primarily rib crowning one could use a .300 thick panel with no thinning/ diaphramizing & get a good out come. I've done it. When I order my panels for a B or D my max thickness request is .360. M,L, O can be .320 no problem. That being said I've seen lots of things that work & in the case of the B boards (as mentioned ) variance in thickness the thin one sounded fabulous but showed more evidence of compression. It's a judgement call. Dale Dale, Internet was down for a little over 24 hours. Sorry to reply so late. I was questioning wether there was some formulae that you used to calculate what thickness of panel you will use based on the species selected. Naturally this also hinges upon what type of panel support you plan i.e. RC&S or CC. Greg ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/b9/47/d0/10/attachment.htm ---------------------- multipart/alternative attachment--
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