Abstract: A machine tool, particularly of the milling and boring type, comprising: a support for a spindle that accommodates coaxially a boring bar that is connected thereto by means of hydrostatically supported bearings, elements for the joint rotation of the spindle and of the boring bar about a main machining axis, elements for the translational motion of the boring bar with respect to the spindle along the main axis. First ducts for feeding fluid to the hydrostatically supported bearings are provided through the spindle. The boring bar has elements for transmitting the fluid from a provided distribution unit, which is substantially fixed to the support, to the first ducts, which rotate with the spindle.

Abstract: A horizontal milling-boring machine including a horizontal bed anchored to the floor, a column structure supported by the bed and slidable there along, a slide carriage slidabe vertically along said column structure, and a slide supporting the tool head and movable axially to said carriage in a direction perpendicular to the axis of said bed, characterized in that: said bed is monolithic and is separated from the work table,—said column structure is formed as a portal, with two columns connected together by an upper crosspiece and provided lowerly, for their support on the bed, with portions lying external to the opening of said portal, which is delimited laterally by said columns and extends lowerly into proximity with said bed—the slide carriage is slidable along the facing internal walls of said columns,—guide structure and drive structure being interposed between said column structure and said bed.

Abstract: A horizontal milling-boring machine including a horizontal bed anchored to the floor, a column structure supported by the bed and slidable therealong, a slide carriage slidable vertically along said column structure, and a slide supporting the tool head and movable axially to said carriage in a direction perpendicular to the axis of said bed, characterized in that: said bed is monolithic and is separated from the work table,—said column structure is formed as a portal, with two columns connected together by an upper crosspiece and provided lowerly, for their support on the bed, with portions lying external to the opening of said portal, which is delimited laterally by said columns and extends lowerly into proximity with said bed—said slide carriage is slidable along the facing internal walls of said columns,—guide means and drive means being interposed between said column structure and said bed.

Abstract: The slide 14 carries a support 18 for a plurality of tools, which is secured to a sleeve 34 rotatable and axially slidable on a body 38. The slide 14 carries a series of hydrostatic bearings 36, 39 and 87 to guide rotatably the sleeve 34 and axially the body 38. The sleeve 34 is antulrly tied to the body 38 through a normally closed front clutch 42, 43, which is opened by axially displacing the sleeve 34 with respect to the body 38, through a hydraulic device 44, 47. A reversible electric motor 52 is operated for rotating the sleeve 34 to select the tool, and may be numerically controlled for continuously displacing the tool during a working operation.