Patent ID: 6904652

Claim:
A universal machine tool for milling and lathing operations, comprising: a machine base; a motor-driven workpiece slide horizontally movable in one coordinate axis on said machine base, said workpiece slide having a console; a turntable mounted on said console via a ring bearing, said turntable having a lower ring-shaped surface and rotational vertical axis; a gearless drive motor having a stator fixedly connected to said console and a rotor fixedly connected to said turntable; and a motor-driven machining unit selectively movable in two other coordinate axes, said machining unit having a work spindle designed for selectively receiving, holding and fixing a milling or a lathing tool; said drive motor being positioned in an annular space within said console; said ring bearing arranged at approximately half the radial distance between the rotational vertical axis of the turntable and the rotor; a bushing between said stator and said console; said stator being formed as an inner elongated ring fixed with its circumferential inner surface to a circumferential wall of said bushing within said annular space; and said rotor being formed as an outer elongated ring arranged coaxially to said stator ring and fixed to the lower ring-shaped surface of said turntable, said lower ring-shaped surface of the turntable being arranged in the region of a radial outer edge of the turntable, wherein the console, drive motor and turntable are designed for generating the necessary torques and rotational speeds for the machining of workpieces by lathing, and also are designed to produce exact and fixed positioning of the turntable with the workpiece clamped thereon in predetermined working positions for milling operations.