Abstract: A slide (4) made up of a table (8) and a base (11) is actuated radially relative to a workpiece (M) to be machined via a stud (17) adjustable in a slot (16). The position of the stud can be regulated by means of a screw and a motor. A roller (24) borne by the stud then moves along another slot (25) in an arm (26) integral with a shaft (7f). The oscillations of the shaft are controlled by a control cam. Displacement of the stud relative to the pivot point of the arm permits the transmission ratio, hence the course of travel of the slide, to be varied. The angle .alpha. between the directions of the slots is other than zero at the end of the travel, so that the final position of a tool (29) can be adjusted by means of the control motor.

Abstract: The control device comprises a computer program. The machining of a workpiece comprises the writing of a program, the essential element of which is a step table. Starting from a predetermined profile of the workpiece, the movements of the X- and Y-axes are plotted in successive steps, and the cumulated intervals of time for obtaining the required movements, as a function of the characteristics of the machine tool and of the workpiece, are stored in the form of a table containing the movements .DELTA.t.sub.xi and the movements .DELTA.t.sub.yi. The reading of the steps, carried out as a function of an appropriate clock signal generator, brings about the successive transmission of the pulses which cause the X- and Y-axes to take their successive steps.

Abstract: On a processing machine having a tool-holding frame (13) facing a mutli-spindle barrel (3), one of the work stations is equipped with a support (23) bearing a spindle (38) capable of being driven axially (22) and rotatingly (C). During the cycle of operations, an auxiliary chuck mounted in a body (39) can move to grasp the end of a bar or a workpiece (57) and guide it into the field of a milling cutter (60). An AZ2C-axis control makes it possible, for example, to machine a helical groove in the cylindrical flank of the workpiece.