Abstract: For correcting eccentricity of a tool chucked in a first part of an at least two-part toolholder, which first part is detachably connected via clamping means to a second part of the toolholder, which is clamped in a machine tool and rotates about an axis of rotation, setting means are provided by means of which the first part of the toolholder is displaceable relative to the second part. Radial eccentricity of the tool can thereby be corrected. Furthermore, between the first and second parts of the toolholder, two rings are disposed coaxially with, and rotatingly about, the axis of rotation. These rings have annular surfaces, one of which is inclined relative to the other at a certain angle. By mutual rotation of the two rings, the first part of the toolholder can be inclined relative to the second part, whereby an angular error of the tool can also be corrected.

Abstract: The reamer having an interchangeable cutter head and a coolant-lubricant feed (24, 25, 26, 27) supplying the cutter head from outside includes a coaxial opening (2) for receiving the cutter head, which is cylindrical. The end of the coaxial opening nearest the reamer shank (1) is provided with an outwardly opening first cone (13), the conical surface of which is provided with deepened portions (14) at three locations. The cutter-head shank (4) is cylindrical and insertable in the coaxial opening of the reamer shank until a thickening forming a second cone (12) rests against the first cone of the reamer shank. By means of a clamping bolt (8) passing through the cutter head, the second cone can be pressed into the first cone, which becomes deformed. This deformation also affects the wall of the reamer shank in the front region of the coaxial opening, whereby the cutter-head shank is likewise held. The clamping bolt can additionally be used for expanding the cutter head.