Ron Wrote Yes, non linear. Beam deflection is linear. Twice the load on a beam produces twice the deflection. Panel compression makes the system non linear so twice the load produces less than twice the deflection. The spring rate increases as it's loaded. A purely compression crowned board has a much faster rate of increasing spring rate than a rib crowned assembly with only mild panel compression. > * Yes and perhaps assumptions are being made in my case too. I've > been ribbing at about 6% lately so my evolutionary process continues. Ah, then you're getting down into super soft hammer country where you'll be adding lots more ribs very soon now. Ron... Are you saying that in Something like a Steinway A (or other) which in my opinion has a pretty good rib scale as far as mechnanical support goes that increasing the beam strength on the original 12 ribs isn't enough stiffness to support bearing without adding more ribs? Dale -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20060330/3fdaef68/attachment.html
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