Abstract: A rotary machine tool that includes first and second slides mounted on a bed for opposed movement transverse to the axis of rotation of a workpiece. Each of the first and second slides includes facility for mounting a cutting tool for engaging diametrically opposite sides of the workpiece from directions transverse to the workpiece axis of rotation. A control mechanism is coupled to the first slide for moving the first slide relative to the bed for controlled engagement of the cutting tool on the first slide with the workpiece. A hydraulic actuator is coupled to the second slide for moving the second slide relative to the bed in a direction transverse to the workpiece axis. A synchronizing valve is operatively coupled to the first slide for operating the actuator responsive to movement of the first slide so as to move the second slide by means of the actuator in a manner equal and opposite to movement of the first slide by the controller.

Abstract: The piston rod of a longitudinal feed cylinder of a tracer controlled lathe is connected with the lathe carriage by means of an operative connection consisting of another hydraulic cylinder or a cam arrangement which permits the rod of the feed cylinder to continue movement in the feed direction while maintaining the carriage in a fixed position. This permits the cutting tool mounted on the cross slide to machine a sharp shoulder on the workpiece perpendicular to the axis of rotation of the lathe spindle. The circuit includes a tracer valve that is variably restricted in accordance with movement of a stylus following a contoured template. The tracer valve is conneted to a feed line from a high pressure pump which extends directly or indirectly to one side of a hydraulic cylinder for displacing the cross slide in the carriage. The opposite side of the cross slide cylinder is connected to a low pressure pump.