—Boring always involves the enlarging of an existing
hole, which may have been made by a drill or may be the result of a core in a
casting.
—An equally important and concurrent purpose of boring
may be to make the hole concentric with the axis of rotation of the workpiece
and thus correct any eccentricity that may have resulted from the drill
drifting off the centerline. Concentricity is an important attribute of bored
holes.
—When boring is done in a lathe, the work usually is held
in a chuck or on a faceplate. Holes may be bored straight, tapered, or to
irregular contours.
—Boring is essentially internal turning while feeding the
tool parallel to the rotation axis of the workpiece.
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