Diameter-compensating bush for a tool holder

A method of mounting a tool in a tool holder comprising:

• a) preparing a tool holder to hold a rotary tool, the tool holder including chucking means that define a locating opening and that are radially adjustable between a radially expanded release position and a chucking position for exerting radial interference fit forces on the tool, wherein the step of preparing the tool holder includes expanding the chucking means of the tool holder to the radially expanded release position;
• b) preparing a diameter-compensating bush to hold the rotary tool in the tool holder, the diameter-compensating bush having an outer sleeve and an inner sleeve arranged coaxially with and radially inward of the outer sleeve, the outer sleeve having a cylindrical external surface and a conical inner surface, the inner sleeve having a conical external surface bearing against the conical inner surface of the outer sleeve and a cylindrical inner surface having an internal diameter which can be changed for diameter compensation by axial displacement of the inner sleeve and the outer sleeve relative to one another down to a diameter allowing the inner surface of the inner sleeve to bear against an external surface of a shank of the rotary tool, the step of preparing the diameter-compensating bush including mounting a shank of the rotary tool within the cylindrical inner surface of the diameter compensating bush;
• and
• c) mounting the diameter-compensating bush and rotary tool in the tool holder by inserting the diameter-compensating bush through the locating opening into the chucking means in the release position and placing the chucking means of the tool holder into the chucking position with the chucking means pressed onto the cylindrical external surface of the diameter-compensating bush to exert radial interference-fit forces on the diameter-compensating bush and on the shank of the rotary tool.