Milling tool holder and milling tool

A milling tool holder, comprising:

• a first holder part having a first cutting insert receptacle which is configured to receive a first cutting insert and having a second cutting insert receptacle which is configured to receive a second cutting insert;
• a second holder part which is variably positionable with respect to the first holder part along a longitudinal axis in order to adjust a milling width, wherein the second holder part comprises a third cutting insert receptacle for receiving a third cutting insert and a fourth cutting insert receptacle for receiving a fourth cutting insert;
• a spacer element which is arranged between the first holder part and the second holder part and which is configured for adjusting the milling width;
• a locking mechanism which is configured to fix the first and second holder parts to the adjusted milling width,
• wherein the first holder part and the second holder part are positioned with respect to one another in such a manner that the third cutting insert receptacle is arranged in the circumferential direction between the first cutting insert receptacle and the second cutting insert receptacle, and in that the second cutting insert receptacle is arranged in the circumferential direction between the third cutting insert receptacle and the fourth cutting insert receptacle,
• wherein the first holder art comprises a first non-threaded cylinder surface which extends symmetrically to the longitudinal axis,
• wherein the second holder part comprises a second non-threaded cylinder surface which extends symmetrically to the longitudinal axis,
• wherein the spacer element comprises a third non-threaded cylinder surface which corresponds to the first non-threaded cylinder surface of the first holder part and contacts the first non-threaded cylinder surface of the first holder part to center the spacer element,
• wherein the spacer element comprises a fourth non-threaded cylinder surface which corresponds to the second non-threaded cylinder surface of the second holder part and contacts the second non-threaded cylinder surface of the second holder part to center the spacer element
• wherein the first non-threaded cylinder surface and the second non-threaded cylinder surface are offset with respect to one another along the longitudinal axis and extend coaxially with respect to one another, and
• wherein a diameter of the first non-threaded cylinder surface is different from a diameter of the second non-threaded cylinder surface.

A milling tool holder, comprising:

• a first holder part having a first cutting insert receptacle which is configured to receive a first cutting insert and having a second cutting insert receptacle which is configured to receive a second cutting insert;
• a second holder art which is variably positionable with respect to the first holder art along a longitudinal axis in order to adjust a milling width, wherein the second holder part comprises a third cutting insert receptacle for receiving a third cutting insert and a fourth cutting insert receptacle for receiving a fourth cutting insert;
• a spacer element which is arranged between the first holder part and the second holder art and which is configured for adjusting the milling width;
• a locking mechanism which is configured to fix the first and second holder parts to the adjusted milling width, wherein the locking mechanism comprises a screw which is inserted through the spacer element into a thread which is arranged in the first holder part;
• wherein the first holder part and the second holder part are positioned with respect to one another in such a manner that the third cutting insert receptacle is arranged in the circumferential direction between the first cutting insert receptacle and the second cutting insert receptacle, and in that the second cutting insert receptacle is arranged in the circumferential direction between the third cutting insert receptacle and the fourth cutting insert receptacle,
• wherein the first holder part comprises a first non-threaded cylinder surface which extends symmetrically to the longitudinal axis,
• wherein the second holder part comprises a second non-threaded cylinder surface which extends symmetrically to the longitudinal axis,
• wherein the spacer element comprises a third non-threaded cylinder surface which corresponds to the first non-threaded cylinder surface of the first holder part and contacts the first non-threaded cylinder surface of the first holder part to center the spacer element, and
• wherein the spacer element comprises a fourth non-threaded cylinder surface which corresponds to the second non-threaded cylinder surface of the second holder part and contacts the second non-threaded cylinder surface of the second holder part to center the spacer element.