This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Thankyou muchly Ron. If I may take this unribbed (at this point) laminated and curved board a step further then. What if you add to the mix : 1: align the grain of the panel perpendicular to the bridge. 2: rib cross grain to equalize stiffness. Do you think it would be strong enough with a standard thickness to do the job then ? Would you expect to be able to use less ribbing then usually ? Cheers RicB Ron Overs writes: If you are thinking about the application of a laminated panel without ribs, this wouldn't have sufficient stiffness to support the downbearing load if the panel thickness was a standard nominal thickness (say between 7-9 mm). A panel on its own would have insufficient sectional depth to achieve the stiffness required. If you were to use a thicker panel, at some point you would achieve a satisfactory stiffness but the overall mass of such an assembly would greatly exceed the mass of a conventionally ribbed panel of normal thickness. One of the principal structural benefits of the ribs is that it gives the overall assembly a sufficient sectional depth that the panel and ribs can, together as a unit, provide the necessary stiffness. I'm not suggesting that a laminated panel wouldn't have a higher stiffness than an equivalent thickness solid panel. It certainly would, but not enough to support downbearing in its own right. If you find this hard to believe just laminate a little section for you own investigation. Best, Ron O. ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/eb/68/80/73/attachment.htm ---------------------- multipart/alternative attachment--
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