Woodworker's Journal 1993-17-6, страница 32
Special Techniques Building and turning a bowl out of glued-up wood segments is a fun project that's interesting to do and. depending upon the species of woods used, can yield quite beautiful bowls. What's nice about this method is that you don't have to start with a large solid piece of wood, but can use many small pieces. Materials The woods used for the bowl described in this article are walnut and oak. Other woods, such as cherry, maple and mahogany, can also be used to make very attractive turned bowls. As shown in Fig. 1, the wood required for our four-layered bowl is: • For 3 upper rings: 24 segments (12 oak. 12 walnut), each measuring in. thick by I '/-i in. wide by 3s/io in. long. 7f> • For I lower ring: X segments (4 oak. 4 walnut), each measuring l/4 in. thick by 1 V-4 in. w ide by .Vs/if, in. long. • For base: I walnut disk. Vj in. thick by 7 in. diameter. Before cutting the required angles, make sure there are sufficient lengths of i V-i in. and I'/j in. stock available (i.e. rip the stock before the saw is set up to cut the angled segments). For our bow I, you can obtain the stock for the 3 upper rings from a pair of Vj in. by I Va in. by 48 in. boards, one oak and the other walnut. The lower ring segments can be obtained from a pair of 'A in. by I3/* in. by 16 in. boards, one oak and one walnut. Our bowl, once turned, will be a little less than 8 in. in diameter, but by altering the lengths and widths of the segments, and their numbers, you can easily change the size. Just keep in mind that larger bowls usually require more segments. Calculating the Angle The required angle for the bow l segments can be determined in the following manner: I. Divide the number of segments per ring into 360 degrees. For this project use 8 segments. Therefore, 360 divided by 8 = 45 degrees. 2. This answer is divided by 2. Therefore. 45 degrees divided by 2 = 22'/: degrees. This is the required angle the ends of each segment are cut to. It should be noted that this cutting angle will change with any change in the number of segments per ring. Setting the Cutting Angle The secret in cutting correct angles for Tin.' Woodworker's Journal Building and Turning a Bricklaid Bowl h\ Robert L. Belke |
