Popular Woodworking 2005-08 № 149, страница 94

At the Lathe

continued from page 91

Try the fit, and modify the recess as necessary. The button should fit snugly into the recess so the workpiece won't move off center, and the bowl shouldn't rock. You can test the fit with the lathe running, by gripping the bowl securely and pressing it onto the block; this will create burn or burnish marks and you will be able to see any high spots. If you are not comfortable doing this (the bowl could be twisted from your hands), just keep testing the fit with the lathe turned off until you have it right. It may take some trial and error. G lue the bowl onto the block with thick cyanoac-rylate glue on the bowl and accelerator on the block. Rotate the bowl to spread the glue evenly and hold for a few seconds until it sets. Turn, sand and finish the interior of the bowl.

To remove the bowl, place a flat chisel or skew along the glue joint and strike the chisel with a quick, sharp blow with a mallet. The bowl should pop right off of the waste block. (If you can't manage to hold the chisel and the bowl with one hand, put a board covered with a towel or blanket across the lathe bed to cushion the bowl when it falls.)

A simple way to finish the foot (if it will not be too deep) is to place some padding over the glue block, put the bowl over that, and bring up the tailstock to hold it in place. Bring the live center forward slowly and gently; it is possible to split the bowl if you use too much pressure. With a fingernail-grind or detail gouge, cut a slight hollow in the foot almost to the center. Then remove the bowl from the lathe, nip off the remaining bit of waste with a hand chisel and sand smooth.

Another way to remount the bowl to turn the foot is in a doughnut jig. This jig holds the bowl between a disc of plywood attached to a faceplate and another disc with a hole cut into it; the discs are held together with bolts and wing nuts (the nuts always go on the side toward the headstock). The bowl is cushioned with carpet foam. This mounting is a good choice if the foot will be deep or will have a lot of detail, as it allows better access to turn the foot.

Usually the glue joint breaks cleanly, and there will be only a little cleanup required.

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Popular Woodworking August 2005