Some bits are especially designed for smooth boring in furniture and cabinet work. These are extension-lip tools, which have outlining spurs that sever wood fibers well ahead of the extension-lip cutting edges. They produce a clean-cut hole, largely because the double-screw point provided gives a medium feed, for best results. One of the finest boring machines is a universal-spindle gang borer, so designed as to allow placement of the boring chuck in practically any desired position. Special bit clusters can be furnished in any case where extra-close center hole groupings are required.
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