Abstract: A revolving head for machine tool including one fixed frame, one spindle-bearer turret movable in rotation with respect to this frame, at least two tool bearer spindles fitted to the turret, rotation devices for the spindles and automatic driving devices to rotate the turret. The turret includes a first element secured to the frame and a second element movable with respect to the first element. The automatic driving devices includes an axial piston and a rotary piston to move respectively axially and in rotation the second element of the turret with respect to the first element.

Abstract: The invention relates to a travel device in a machine tool having a travel slide (2) which supports a machining unit (4) and which is mounted on a frame by means of runners having balls. Frame (1) is fitted with two parallel rails (12) having a wide-mouthed groove (13) on their outer face. A base plate (3) of the slide (2) has on its lower face four runners guided by balls (15) comprising a section where the balls (16) project so as to be engaged in the groove (13) of the rail. The runners (15) are protected from machining scraps. They are also prestressed by adjusting screws (24) so as to exert permanent pressure on the rails. Such a device can be used in all machine tools or transfer installations fitted with a travel slide.