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Grinding-wheel cutters have a planetary motion, rotating rapidly about their own axes, which in turn slowly rotate with the boring head about the spindle axis; the hole diameter is controlled by adjusting the distance between the wheel axis and the spindle axis. The spindles on boring machines may rotate about vertical or horizontal axes.
Boring machines used in toolmaking shops have one vertical spindle and a work-holding table that can be moved horizontally in two directions perpendicular to each other so that holes can be accurately spaced. On some machines the spacing error is less than 0.002 percent. In mass-production plants, special boring machines with multiple spindles are common.
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Boring Machines