Metal-cutting machine tool

A metal cutting machine tool, comprising:

• a base body rotatable around a rotational axis relative to a workpiece to be processed, the base body having a peripheral surface intersecting a front end surface, which is orthogonal to the rotational axis;
• a plate seat arranged on the front end surface outside the rotational axis and having a positioning surface facing the rotational axis;
• a tangentially mounted cutting plate held in the plate seat by a fastener, the cutting plate having a cutting edge and a reference surface configured for radial positioning of the cutting edge, wherein (i) the reference surface abuts the positioning surface and faces away from the rotational axis, (ii) the reference surface is transverse to a shortest imaginary connecting line running through a radially outer point of the cutting edge and the rotational axis, and (iii) the connecting line encloses a smallest angle in a range of 80° to 90° with the reference surface;
• the fastener having a longitudinal axis parallel to the rotational axis;
• a coating provided on the cutting edge and on the reference surface;
• wherein the plate seat has an axial support surface for abutting a bottom surface of the cutting plate, the axial support surface being arranged orthogonal to the rotational axis, the axial support surface is entirely disposed radially outward of the positioning surface;
• and
• wherein the positioning surface is orthogonal to the axial support surface;
• wherein the plate seat defines a free space radially inward of the positioning surface and wherein a radially inward facing surface of the cutting plate is spaced apart from an opposing surface of the plate seat whereby the free space defined by the plate seat allows radial inward compensating displacement of the cutting plate as a function of the thickness of the coating.