Tool system for machining a workpiece

A cutting tool system for machining a workpiece, comprising:

• a cylindrical holding shank with a workpiece-side end and an opposing drive-side end, wherein a cutting head fixture is arranged on the workpiece-side end, and wherein a drive fixture is arranged on the drive-side end;
• a cutting head with at least one cutting edge and with a cutting head hub matching with the cutting head fixture of the holding shank;
• and
• a tool coupling with a tool interface and with a coupling hub matching with the drive fixture, the coupling hub extending along a longitudinal direction;
• wherein the coupling hub comprises a plurality of radially projecting elevated regions on which bearing faces are provided, wherein the bearing faces bear against corresponding supporting faces of the drive fixture of the holding shank, wherein interspaces are provided between the elevated regions, and wherein the drive fixture is firmly connected to the coupling hub by means of a joining material introduced into the interspaces between the elevated regions,
• the elevated regions being configured
• (i) as circular rings which are spaced apart from one another in the longitudinal direction of the coupling hub, or
• (ii) as at least four webs which are spaced apart from one another in a circumferential direction of the coupling hub, wherein each of the at least four webs extends along a respective middle axis that runs parallel to the longitudinal direction of the coupling hub.