This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment >From time to time the subject of gluing up soundboard panels in the = small shop comes up. One of the difficulties encountered is that of = machining the finished panel smooth and flat to some particular = thickness. This process is exacerbated by a characteristic of spruce = (well, all woods to some extent--it's just a bigger problem in spruce) = called "slope." When trees start to grow as seedlings they do so with a severe twist, as = much as 45=BA in some trees. They do this for survival--their tiny = little trunks do not yet have the strength to withstand the ravages of = wind and storm. Or the occasional stomping of an otherwise friendly = grizzly. This twist gives the little tree trunk the flexibility it needs = to survive and grow. Over the years this twist straightens out and, = ideally, the tree grows straight and true. Often, however, this twist = will reverse itself just a bit giving rise to the characteristic of = slope in lumber cut from the tree.=20 In most species commonly used by man for his various endeavors this is = not a serious problem. It is, however, a serious problem for the = woodworker attempting to hand-plane a glued-up spruce panel. All of this introduction is to say that there is a good article on the = subject in the current issue of WoodenBoat Magazing (#172--May/June = 2003). Written by an instructor at the Northwest School of Wooden Boat = Building in Port Townsend, Washington, it deals mostly with white oak = being prepared for steam bending but the principles apply to all woods Del Delwin D Fandrich Piano Designer & Builder Hoquiam, Washington 98550 USA 360.532-2563 360.532-6688 pianobuilders@olynet.com ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/18/f8/72/48/attachment.htm ---------------------- multipart/alternative attachment--
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