Method and appartus for retaining a tool in a tool holder with defined contact surfaces

A method for creating a shrink-fit tool holder for retaining a shank of a tool, the method comprising:

• forming in a front face of a tool holding section centered on a rotational axis a retaining bore for holding the shank of the tool;
• and
• forming in the front face of the tool holding section of the shrink-fit tool holder a plurality of defined contact surfaces each partially protruding in the retaining bore for directly engaging the shank of the tool for holding the shank of the tool in the retaining bore at the defined contact surfaces.

19-20. (canceled)

A method for creating a shrink-fit tool holder for retaining a shank of a tool, the method comprising:

• forming in a front face of a tool holding section centered on a rotational axis a retaining bore for holding the shank of the tool;
• and
• forming a plurality of depressions around the retaining bore with defined contact surfaces between pairs of depressions of the plurality of depressions such that the defined contact surfaces are formed integral with and as a single piece of material with the tool holding section, and wherein the defined contact surfaces partially protrudes into the retaining bore for directly engaging the shank of the tool for holding the shank of the tool in the retaining bore at the defined contact surfaces.