Abstract: A boring and facing head, rotatively driven by the mandrel of a machine tool, with a turning tool mounted on a mounting slide, which may be controllably driven transversely of the axis (X) of the head body by a threaded shaft (12) operatively connected to a cylinder body (11), integral with a mandrel (4) and rotatably housing a ring gear (17), operatively connected to a gear wheel (19), driven by a controllable motor (8) and wherein the ring gear (17) comprises a circumferential tooth arrangement engaging with a gear wheel (52), integral with the driving shaft (12).

Abstract: A rotary tool holder (1) with a balance device, having a cylindrical body (5) containing a T-section circumferential slot (7) and balance weights (8) in the shape of circular sectors attached with a snap action to the circumferential slot (7), the weights (8) being moveable and angularly positionable relative to the body (5) of the tool holder (1).

Abstract: Device for the precise coupling of two cylindrical parts, especially to form compound tools, with the aid of two cylindrical bodies, one of which has a seat for accepting a pin projecting from the other cylindrical body, it being provided that the front end of the body with the coupling seat be given an inclined wall engageable with an inclined wall branching away from the base of the coupling pin of the other cylindrical body, that the transverse hole in the projecting pin accepts a threaded bush which engages with a cylindrical-headed screw, and that the free ends of the threaded bush and of the screw head have inclined circumferential surfaces engageable with inclined circumferential surfaces defining the transverse holes on the side facing the coupling seat.

Abstract: Device for the automatic engagement of the feed movement and of the return movement of the tool slide of a boring head, in which a gear rim is arranged on the inside of the head housing, which gear rim is provided with radially projecting pins, on which camlike thickenings of a ring are mounted, which interacts with vertically arranged cylindrical pins, which are acted upon via spring means, the cylindrical pins being arranged in a position which is pressed downwards in such a manner that they act upon a control disc, which is in work connection with a control cylinder which has a peg, which interacts with a displaceable sleeve and serves to bring a toothed wheel with spur gearing or a second toothed wheel with spur gearing into work connection with a first gear arrangement or with a second gear arrangement respectively and that furthermore means are provided, which form part of a gear arrangement, in order to carry out the feed movement or the return movement of the tool slide.

Abstract: A milling and drilling head for a machine tool has an input shaft housed in a stationary case also incorporating a control means drivingly connected to a ring gear which is fast with a moving case portion accommodating at least one tool holding spindle driven off the master spindle of the machine tool and being set at an angle to the X-axis thereof.

Abstract: A boring and facing head for use in a machine tool comprising a body for insertion into a spindle on the machine tool, a tool, a slide mechanism for supporting the tool for movement transversely of the body, a series of shafts and gears for actuating the slide, and a coupling tongue located at the end of one of these shafts and slidably engageable with a rotary device supported by the machine tool whose rotary movement is precision-controlled by a numerical control unit.