Importance

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Abstract

A high-speed drilling or milling spindle (10) comprises a stator (11) that can be attached to a machine tool (12), a rotor (13), and a rotary drive (40, 41) acting between stator (11) and rotor (13). The rotor (13) has a receptacle (15) for a rotating, metal-cutting tool (16). The rotor (13) is supported with respect to the stator (11) by means of at least a first and a second rolling bearing (22, 32) spaced axially away therefrom. The rotor (13) is supported on thrust and radial bearings. The rolling bearings (22, 32) have a very small thrust angle (24, 34). They essentially act as radial bearings. A third bearing is provided as the thrust bearing in the form of a magnetic bearing (50). The magnetic bearing (50) is adjustable in terms of its axial bearing force as a function of the axial forces (F.sub.a) acting on the tool (16).

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First Claim