Apparatus for metal-cutting machining of wear-affected bit holders of road milling machines, and use of an apparatus for overhauling such wear-affected bit holders

An apparatus for metal-cutting machining of wear-affected bit-head-proximal end regions of bit holders of a road milling machine, comprising:

• a rotary actuator including an output member rotatable around an actuator rotation axis;
• at least one material-removing tool rotatable around a tool rotation axis, the at least one material-removing tool being configured to be coupled to the output member so that the at least one material-removing tool and the output member are rotatable together;
• a positioning arbor extending along an arbor axis, the positioning arbor being configured to be introduced into a bit receptacle opening of at least one of the bit holders, the positioning arbor including an abutment segment located radially remotely from the arbor axis and facing away from the arbor axis in a direction having a radial component, the abutment segment including an abutment surface configured for abutment against an inner wall of the bit receptacle opening, the abutment surface including all surface area of the positioning arbor that abuts against the inner wall, and the abutment surface extending continuously completely around the arbor axis;
• wherein the at least one material-removing tool includes a material removing region;
• wherein the tool rotation axis is configured to be always parallel to and spaced laterally from the arbor axis during a material-removing operation so that the at least one material-removing tool is arranged to generate by the material-removing operation a flat end surface extending normal to the arbor axis on an uppermost end of the at least one of the bits holders with respect to said arbor axis and surrounding a bit introduction orifice of the bit receptacle opening of the at least one of the bit holders when the positioning arbor is received in the bit receptacle opening;
• and
• wherein during machining of the flat end surface, the entirety of the at least one material-removing tool is arranged between the output member and the entirety of the abutment surface of the positioning arbor in a direction that extends parallel to the tool rotation axis.