Knife holder and base system for milling machine

A cutter holder and base system for a milling machine, comprising a cutter holder and a base,

• wherein the base is provided with a hole-shaped inner area, a first curved surface area and a second curved surface area;
• the first curved surface area and the second curved surface area are disposed in a circumferential area of the hole-shaped inner area and are arranged at an angle formed by the second curved surface area and the first curved surface area;
• the first curved surface area comprises a first curved surface and a second curved surface, and the second curved surface area comprises a third curved surface and a fourth curved surface,
• wherein the second curved surface area and the first curved surface area are adjacent to a first transition curved surface and a second transition curved surface, the first and second transition curved surfaces being located between the first and second curved surface areas, and wherein a first main longitudinal axis of the first transition curved surface and a second main longitudinal axis of the second transition curved surface form a nonzero angle.