Ray Stubbs
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WR Rocks!
Posts: 83
Columbia, Mo. USA
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The following instructions are given for how to make the top ring on the bowl. I am assuming everyone can get the lower portion without help. Beginning with the 3 figures shown, no. 1 is the hexagon block, no. 2 is the same block altered as shown. No. 3 is the same block shown in relationship to the bowl. First, a determination needs to be made on the number of hexagon blocks required. The number of hexagon blocks on this bowl is 30. (A different number of blocks may be used, but the process is the same.) With that number it is found that 360 degrees divided by 30 equals 12 degrees. 12 degrees is the inclusive angle, and is shown in figure 3 of the hexagon block after adjustments. I have cut or ground off 6 degrees from each side of the hexagon block. With some inspection it is determined where the diameter of these blocks will be placed on the bowl. Looking at figure 3 the diametrical position of the ring is roughly 1/3 of the width of the ring from the outside. Taking in consideration there will be filler blocks added outside and inside of the hexagon ring. On this bowl the diameter line is at a diameter of 10.75 inches or a radius of 5.375. There are two edge points where the diameter of 10.75 passes through the hexagon and represent the hypotenuse of a right triangle, as shown in figure 3, and the radius is 5.375. The right triangle is formed from the center of the bowl to the middle of w then down to the edge of the hexagon. Now to calculate w shown in figure 3, trigonometry tells us that w/2 equals the sine of 6 degrees multiplied by the hypotenuse. Then w equals 2 times the results. When the numbers are crunched, it is found that w/2 equals .562 or 9/16 of an inch. This number is the width of the 3 different woods that is used to make the hexagon. The height will be Ύ of an inch. If the wood is cut at 9/16w x 3/4h then the hexagon of the correct size of 1 1/8 inches across the flats, which is w. With adequate wood, of 3 different shades, cut to the dimensions as described above, and on the table saw set the blade to 30 degrees from vertical and make a first cut with the piece positioned with the 3/4 dimension horizontal. Then set a stop to make the next cut so that the dimension across the flat is .649 or as near as possible. You will need to use calipers for this operation. Notice the angled length is the same as the horizontal length. Cut 30 pieces of each wood then you are ready to glue the hexagon together. For the inside and the outside, place the glued ring on a piece of wood, of your choice, both inside and outside pieces should be of a different wood than are used to make the hexagon. Then scribe a line around for the filler pieces and cut these out and glue into place. From the corner of the hexagon, it will be the highest point, 3/8 to ½ inches of material was added. Also the filler pieces are positioned with the grain parallel to the ring. I hope this helps. If anyone needs further clarification, send me a message with contact information and Ill get back to you.
