Abstract: A workpiece (1) is fixed by means of a chuck (4) and rotates with a spindle (3) in a headstock (2). A first cam (30) is fixed to the main shaft of the spindle. Its control surface guides a feeler roller (31). A rotary pulse generator (8) is actuated by the rotation of the spindle shaft. An auxiliary motor (10) is disposed on a cross-slide (12) and causes an auxiliary shaft (21) to rotate. The pulse generator produces synchronization between the spindle shaft and the auxiliary shaft. The latter bears a second cam. According to the position of the cross-slide, the exact location of teh tools (16, 17) is determined by the first cam or by the second.

Abstract: An auxiliary shaft (16) mounted coaxially with a main shaft (5) has at the top an eccentric (17) operatively connected via grooving (20, 21) to a tool-fastening plate (13). At the bottom of the auxiliary shaft is a wheel (19) fixed to the eccentric and provided with a recess (18). The recess can engage a fixed lug cam so that a feed motor can cause both the rotary movement of the ball turner and a tool correction effected by a relative rotary movement between the main shaft and the auxiliary shaft. For the sake of accuracy, the angular displacement is limited to an area in which the displacement of the tool-fastening plate caused by the eccentric is substantially linear with the angular displacement. All rotary motions are measured during the operation by a shaft encoder (9) and communicated to a CNC system.

Abstract: For high-precision material-removing machining of the lateral surface of a workpiece (1) rotating with the main spindle (3) of a turning lathe, a cutting tool (17) is fixed on a slide (14) which carries out an axial movement synchronized with the rotation of the main spindle by means of a cam assembly (18, 21, 20) control. The shaft (21) of the cam assembly is rotation-tightly coupled to the main spindle by electric means (8, 10).

Abstract: An auxiliary shaft (16) mounted coaxially with a main shaft (5) has at the top an eccentric (17) operatively connected via grooving (20, 21) to a tool-fastening plate (13). At the bottom of the auxiliary shaft is a wheel (19) fixed to the eccentric and provided with a recess (18). The recess can engage a fixed lug cam so that a feed motor can cause both the rotary movement of the ball turner and a tool correction effected by a relative rotary movement between the main shaft and the auxiliary shaft. For the sake of accuracy, the angular displacement is limited to an area in which the displacement of the tool-fastening plate caused by the eccentric is substantially linear with the angular displacement. All rotary motions are measured during the operation by a shaft encoder (9) and communicated to a CNC system.

Abstract: The pedestal of the accessory apparatus, to be secured to the cross-slide of an automatic lathe, has a sliding guide arrangement for a bearing box in which a rotor is hydrostatically mounted for rotational and longitudinal movement. The rotor is held by a spring with its hydrostatically supported feeler-roll against a control curve which is accommodated encased in the bearing box. The rotor is connected by a sliding key connection to a key shaft seated fast on the shaft of an electric motor secured to the bearing box. The rotor is equipped at its front end with a slide plate guided for radial displacement, to which two diametrically opposite tools are secured. With one of these tools, an outside cylindrical surface adjoining a shoulder is machined on a non-rotating workpiece, whereupon the workpeice is rotated through 180.degree. so that the shoulder can be machined with the aid of the other tool, the slide plate being radially displaced on the rotor until it reaches a stop position.