Composite working lathe

A composite working lathe, comprising:

• a bed,
• a first workpiece headstock which is placed at one end of the bed and which includes a workpiece spindle for rotating a workpiece about a Z-axis;
• a second workpiece headstock which is placed at an opposite end of the bed;
• and
• a tool headstock which is moved relative to the bed in the direction of the Z-axis, which is moved relative to the bed in the direction of an X-axis that is perpendicular to the Z-axis within a plane including the Z-axis, and which is moved relative to the bed in the direction of a Y-axis that is perpendicular to a plane formed by the Z-axis and the X-axis, and which is rotated relative to the bed about a B-axis that is perpendicular to the plane formed by the Z-axis and the X-axis;
• wherein the tool headstock includes a tool spindle, to which tool spindle a rotating tool is attached in a replaceable manner to a front part of the tool spindle, and wherein the tool headstock includes a comb-shaped cutting tool rest which holds a plurality of turning tools, and wherein the comb-shaped cutting tool rest is arranged at a rear part of the tool spindle;
• the comb-shaped cutting tool rest includes a first turning tool rest and a second turning tool rest, wherein the first turning tool rest and the second turning tool rest are on opposite sides of the B-axis;
• wherein the first turning tool rest includes a plurality of the turning tools, each of the turning tools of the first turning tool rest being received in a respective opening between a respective pair of comb-tooth-like portions, and wherein the comb-tooth-like portions include a comb-tooth-like portion that forms, on opposite sides thereof, a respective wall of two of the openings;
• wherein the second turning tool rest includes a plurality of the turning tools, each of the turning tools of the second turning tool rest being received in a respective opening between a respective pair of comb-tooth-like portions, and wherein the comb-tooth-like portions of the second turning tool rest include a comb-tooth-like portion that forms, on opposite sides thereof, a respective wall of two of the openings;
• and
• wherein the plurality of turning tools held at the comb-shaped cutting tool rest are spaced along the direction of the Y-axis and are indexed to a processing position, for machining the workpiece, by moving the tool headstock in the direction of the Y-axis.