This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Anyone on the list have a little metallurgy/mechanical-engineering = background? I've made myself a little pneumatic contraption for laminating ribs. I = seem to have just about everything worked out for proper function = (actually, works quite a bit better than I had hoped!) except for some = excessive jig flex. I have a 1.5-inch-thick Delignit pinblock = incorporated into the jig for stiffness, but I still seem to be getting = several millimeters of flex in the middle of the 5-foot long jig when I = pressure up. So I think the solution is to put a couple of angle irons, = or steel channels along the length of the jig. This thing is getting = VERY heavy, so I prefer to not use any more steel than needed. Being that my pinblock stiffener flexes - say - up to 3 or 4 millimeters = over 5 feet, how big a channel (and wall thickness) will I need to have = less than 1 mm flex (zero would be better). I'm figuring maybe a minimum = of 5 to 10 times the current stiffness to get to less than 1 mm flex. = The dimensions I pick out of thin air is to get at least two 2" x 2" x = 1/4"-wall channels. I have proven to myself that I can overbuild just = about any jig, but can anyone help me fine tune these dimensions a = little more efficiently - maybe based at least in part on some = science/engineering-related criteria? Thanks. Terry Farrell ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/df/e7/69/63/attachment.htm ---------------------- multipart/alternative attachment--
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