Abstract: The formation of intermittent chips or chip breakage is assured while machining holes using a rotating tool means by causing the undeformed chip thickness to vary periodically and be reduced to zero in each period of its variation. To obtain the periodic reduction of the undeformed chip thickness to zero, a cutting tool is made to oscillate along its axis of rotation. Tool oscillation is controlled so that the position of the tool along the feed advance path depends on the angular displacement of the tool. The number of oscillation cycles per revolution of the tool may be freely chosen depending on the required length of chip segments. The oscillation amplitude needed to form intermittent chip depends on this number, feed advance per revolution, and number of major cutting edges of the tool means. The oscillatory movement of the tool may be enforced in many ways.

Abstract: The formation of intermittent chips or chip breakage are assured while machining a rotating workpiece by causing the undeformed chip thickness to vary periodically and be reduced to zero in each period of its variation. To obtain the periodic reduction of the undeformed chip thickness to zero, a cutting tool is made to oscillate along its feed advance path. Tool oscillation is controlled so that the tool's position depends on the angular displacement of the rotating workpiece. The number of cycles of tool oscillation per revolution of the workpiece may be freely chosen depending on the required length of chip segments. The oscillation amplitude needed to form intermittent chips depends on this number, feed advance per revolution, and number of simultaneously applied cutting edges of the tool. The oscillatory movement of the tool may be enforced in many ways.