Abstract: The invention relates to a tool spindle (26) for machining centers for the machining of workpieces. The tool spindle (26) is mounted in an extendable manner in a spindle slide (16). The tool spindle (26) is accommodated in a radial hydrostatic bearing. The radial hydrostatic bearing has a bush (72) fitted in the spindle slide (16). The radial hydrostatic bearing is mounted on at least one side in the direction of rotation and in the axial direction.

Abstract: The invention relates to a spindle slide for a machining centre for the machining of workpieces. The spindle slide is accommodated in a slide traversable in the vertical direction and accommodates in turn an axially traversable tool spindle. The tool spindle is driven in the direction of rotation by means of a drive and can be axially traversed by means of a drive. A gearing is provided between the tool spindle and the drive. The rotary drive of the tool spindle and the gearing are arranged in the interior of the spindle slide.

Abstract: A high-speed driving adapter for boring, milling and similar machine tools has a gear housing fixedly connected to a spindle housing of the machine tool. The gear housing rotatably supports a drive shaft having a taper shank disposed in a conical receiving bore in the machine tool spindle. A bearing sleeve is secured to the drive shaft and a tool-receiving spindle is rotatably supported therein and has a conical receiving bore coaxial with the drive shaft for the taper shank of a tool. A sun-and-planet gear arrangement is provided between the drive shaft and tool-receiving spindle. A collet carrier having a center ejecting pin and a collet is axially movable in a coaxial bore in the tool-receiving spindle, the collet having claws which engage an annular groove at an end of the tool taper shank. Several cup springs are arranged concentrically with respect to the collet carrier and urge the collet carrier away from the receiving bore.

Abstract: For facilitating the rotating of a tool-receiving device, in particular an angled milling head, an elongated bushing which is concentric with respect to the milling spindle axis is secured in the milling spindle carriage. The bushing has at its free (lower) end a conical receiving opening. A support sleeve is rotatably supported in the bushing by means of radial and axial bearings. The support sleeve has at its free (lower) end a fastening flange for the tool-receiving device. Above the fastening flange is provided a centering cone conforming in shape to and fitting into the conical receiving opening. An oil film is interpositioned between the opening and the centering cone to provide a uniform support for the support sleeve. The milling spindle is supported in the support sleeve. By means of a ring gear, which is driven by a servomotor, it is possible to rotate the tool-receiving device about the axis of the milling spindle into predetermined angular positions.

Abstract: A tool holder for boring, milling and the like machine tools has a conical shaft with a support member arranged coaxially on said conical shaft. The conical shaft fits into a conical first receiving bore of the machine tool spindle. The support member has a second conical receiving bore for the conical shaft of a tool. The second conical receiving bore is coaxial with the tool holder conical shaft and is smaller than the first receiving bore of the spindle. The tool holder conical shaft has a coaxial bore, in which is axially movable a collet carrier with a collet. The ends of the collet are constructed as claws and engage an annular groove at the free end of the tool conical shaft. Several axially acting cup-spring packages are arranged in the support member concentrically with respect to the second conical receiving bore. The cup-spring packages act onto the collet carrier through several radially extending support arms for clamping the tool conical shaft in the tool holder.

Abstract: An apparatus for chucking and releasing a conical shank of a tool or an additional aggregate on tool machines, particularly drilling and milling machines. The apparatus has a hollow spindle which is supported in a spindle housing and has at its lower end which faces the conical shank a receiving cone for the shank. A draw rod is supported for axial movement limited by a lower and an upper stop, is rotatably movable in the spindle, has at its end which faces the shank threads which can be screwed into threads on the shank, and is connected at its upper end to a drive motor rotor so as to be fixed against rotation but axially movable with respect thereto. Both stops are provided on a sleeve which concentrically surrounds the draw rod. The sleeve is supported on a spring arrangement. It is movable axially downwardly with respect to the spindle under the action of a hydraulically operated piston against the chucking force of the spring arrangement in a direction toward the receiving cone.

Abstract: An apparatus for centering and indexing of milling machine parts, in particular angle milling heads on a spindle carriage of a milling machine. Cooperating indexing elements are arranged on the angle milling head and on the spindle carriage, which elements are simultaneously also the centering elements. These are constructed as four similarly constructed aligning units which are arranged offset to one another each at 90.degree. in peripheral direction. Each aligning unit consists of an aligning tab arranged on the one milling machine part, preferably the angle milling head and a fixing piece provided on the other milling machine part and has a groove therein. The angle milling head can be fixed in predetermined angular positions relative to the spindle carriage through the aligning units.