With the above-described conventional computerized numerical control automatic complex lathe, it is impossible to change the chuck on the work back spindle without stopping the machine. Also during cutting, only one kind of work that matches the chuck can be gripped. Also, a tool other than a chuck, for example a drill, cannot be mounted on the back spindle. Therefore, the work process which can be performed by the back spindle is limited to gripping only one kind of work.

According to the invention this is achieved by providing a thread trimming device adjacent to the stitch forming place and stationary relative to the latter and directly below the workpiece holder. The maximum sliding path into each co-ordinate direction is in each case at least equal to the stretch of the operating range in the corresponding co-ordinate direction plus the distance of the trimming device from the stitch forming place in the corresponding co-ordinate direction.

It is an object of the present invention to provide a computerized numerical control automatic complex lathe with improved back spindle to perform a complex machining processes. The work may be machined with a cutting tool for main machining and also by a machining tool on a turret tool rest. The above-described computerized numerical control automatic complex lathe is so constructed that a rod-shaped work gripped in the machining chuck on the main spindle is machined with a cutting tool for main machining or a machining tool on a turret tool rest, and after the work is regripped in the work chuck on the back spindle, the work is machined with a machining tool as described above while being gripped in this chuck.

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