Woodworker's Journal 2009-33-3, страница 15
Letters Safety First: Learning how to operate power and hand tools is essential for developing safe woodworking practices. For purposes of clarity, necessary guards have been removed from equipment shown in our magazine. We in no way recommend using this equipment without safety guards and urge readers to strictly follow manufacturers' instructions and safety precautions. A Solution to the Curl (Cup)? I found the article by Kerry Pierce I "Chippendale-styled Shaker Candlestand," February 2009] very interesting; however, I have a question regarding the comment, "Nothing can completely prevent an unsupported lop like this one from curling a bit over time." When making high chair trays and chair backrests, I mill the material to half of the desired thickness, then glue the pieces with the grain in opposing directions. While this approach can create a lot of internal part stress, the stresses oppose each other and the part remains flat. This approach also prevents a component from cracking due to abuse, which high chairs repeatedly experience. I am very interested in your thoughts. Bill Corrigan Big lMke, Minnesota WJ Responds: My first reaction to your idea is that your method would result in some discontinuity in grain lines. F'or that reason, I would probably not use it. But on another level, the physics of your idea does offer an intriguing thought, one I think I would like to test in my shop. Ultimately, however, I believe that material used as tops — on tables, desks, chests — will always curl (technically "cup") unless restrained mechanically by, for example, a set of dovetails at each end. And even then that urge to cup may manifest itself if very slightly. This is a phenomenon I've seen in many pieces of my own work (even some that included pretty exotic attempts to restrain the cupping impulse), and in the many antiques I've measured and drawn. In fact, if you extend the timeline out over a period of decades, I'm not sure you could find any exceptions. _ —Kerry Fierce/ Refinish^our Fut ure. A J kT Own your own business?.- Let your passion for furniture lead you into a new business with a Furniture Medic franchise. We're a complete on-site repair and restoration-re finishing business servicing homes and companies as wel( as handling moving and insurance claims. We offer extensive training[and support with a low initial investment and manageable overhead. Financing is available to qualified candidates and franchises are offered nationwide. Mm) fUUJ^fll |||] ]||']|||( . Call today to brush up on the details. rVvsl « ti mim* I www.furnituremedicfranchise.com I'800»RUNYOURS (Circle No 32 on PRODUCT INFORMATION form) Custom Turnings! Since 1979, we've been supplying furniture makers and craftsmen wilh unique wood turnings, toble legs, kitchen island legs, sofa legs and more! Need a unique size or shape? Send us your designs and we'll work with you to create the turning you need. t designs into quality, finished turnings for your custom projects. =\ Sign up for E-letlers to get updates about promotions, new products and woodworking tips at wvm.osbornewood.com 14 (Circle No 47 on PRODUCT INFORMATION lorm) June 2009 Woodworker's Jou ma I |
