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.