Boring can be accomplished on a mill or even a drill press, but is most accurate on a lathe. The boring tool is fixtured in the tail stock. Again, since all fixturing is relative to the central spindle axis, boring on a lathe is more accurate than most other boring methods, an exception being jig boring on a dedicated jig boring machine. The length of the boring bar is of critical importance because of its tendency to bend. The figure below illustrates a boring tool which is double-ended so that it is less prone to the cantilever "diving board" effect.
For design guidelines for bored holes in parts, please check the design for boring section.