Movable fixture for milling rail heads and procedure for replacing cutting plates for such a fixture

A movable fixture for milling rail heads of slide rails arranged in a track bed, the movable fixture comprising:

• a rotating milling head mounted to a milling head drive mechanism supported by a chassis, wherein the milling head comprises cutting plates for milling the rail heads,
• wherein the milling head has a disc-shaped tool carrier connected to the milling head drive mechanism, wherein the disc-shaped tool carrier has a polygonal cross-sectional shape, wherein the sides of the polygonal cross-sectional shape each form a respective contact surface for supporting a respective one of a plurality of carrier segments that are arranged around the periphery of the disc-shaped tool carrier, a plurality of cassettes attached to each of the carrier segments, each of the cassettes being assembled with at least two of the cutting plates, the carrier segments being detachably connected to the tool carrier, and
• wherein the cassettes are each arranged peripherally on the tool carrier with the respective at least two assembled cutting plates, the cassettes each being different with regard to at least one of:
• a number of the cutting plates;
• distances of the cutting plates of the respective cassette from each other;
• rake angle, in a plane of rotation of the milling head, of the individual cutting plates of the respective cassette;
• or inclination angle, in a plane perpendicular to the plane of rotation of the milling head, of the individual cutting plates of the respective cassette.