| 摘要 |
The machine tool spindle has a cylindrical receiving bore (3) and on its front end a plurality of concentric, annular supporting surfaces (4, 5, 6) which are separated from one another by annular grooves (7, 8) formed in the front end. The tool holders (9a) have mating projections (10) of equal diameter which fit accurately in the receiving bore (3) but shank diameters (D3) which differ stepwise from one another, the outside diameter (d1, d2, d3) of each supporting surface (4, 5, 6) being slightly smaller than the outside diameter (D3) of the annular surface (12a) of the corresponding tool holder (9a). When the annular surface (12a) (of a tool holder 9a), which is located at the transition between the shank and the mating projection (10), is in contact with the corresponding supporting surface (4, 5, 6), the or each further radially inwardly located supporting surface is located in axially spaced relationship to the opposite radial surface of the tool holder (9a). |
