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

A method of overhauling a milling drum of a road milling machine, the milling drum including a plurality of bit holders, each bit holder including a bit receptacle opening extending along a receptacle axis, the bit receptacle opening being configured to receive a milling bit shank of a milling bit, the milling bit shank extending along a shank axis, the milling bit including the milling bit shank and a bit head and a bit tip attached to the bit head, at least some of the bit holders having a worn bit-head-proximal end region surrounding a bit-head-proximal end segment of the bit receptacle opening, and the bit holders each having an end surface facing toward the respective bit head during milling operation, the method comprising:

• (a) identifying a bit-holder related wear state of the milling drum;
• and
• (b) before beginning a further wear-causing operation of the milling drum, metal-cutting machining the bit-head-proximal end regions of at least some of the bit holders having end surfaces displaced along the receptacle axis compared with an unworn state of the bit holders, and thereby furnishing the milling drum with bit holders whose respective end surfaces are displaced at the same respective bit holder position along the receptacle axis as a function of the identified wear state.