A tool system includes a machine-proximal shank configured to be introduced into a driven tool receptacle and containing a device for transferring a rotating movement to be picked up from the driven tool receptacle. A tool-proximal shank is configured as a tool holder or to have a tool holder releasably connected thereto. A gear mechanism disposed between the machine-proximal shank and the tool-proximal shank is configured to transfer a rotating movement transmitted by the device in a reduced manner to the tool-proximal shank. At least one insert seat configured on the tool holder for receiving an interchangeable cutting insert is provided on an end face of the tool holder extending transversely to a longitudinal axis of the tool holder. A method for machining a workpiece is also provided.

A tool holder and a parting and grooving tool for an indexable turret have a plurality of tool stations, The adjacent tool stations have a predetermined angular spacing. The tool holder includes a mounting portion and a projected portion, which are connected. The mounting portion has a flat surface extending in an interface plane and the projected portion has a recess for holding the parting and grooving tool. The parting and grooving tool includes a cutting portion and a clamping portion. The cutting portion includes a cutting edge and the clamping portion includes a rear end surface. The parting and grooving tool is mountable in the recess such that a distance from the interface plane to the rear end surface of the parting and grooving tool is greater than a distance from the interface plane to the cutting portion of the parting and grooving tool.

A tool holder and a parting and grooving tool for an indexable turret have a plurality of tool stations, The adjacent tool stations have a predetermined angular spacing. The tool holder includes a mounting portion and a projected portion, which are connected. The mounting portion has a flat surface extending in an interface plane and the projected portion has a recess for holding the parting and grooving tool. The parting and grooving tool includes a cutting portion and a clamping portion. The cutting portion includes a cutting edge and the clamping portion includes a rear end surface. The parting and grooving tool is mountable in the recess such that a distance from the interface plane to the rear end surface of the parting and grooving tool is greater than a distance from the interface plane to the cutting portion of the parting and grooving tool.