Patent ID: 7637700

Claim:
A milling tool comprising: a cutting insert; and a holder to which the cutting insert is removably fitted, wherein the cutting insert comprises: an upper face comprising a rake face; a side face comprising a flank; and a main cutting edge at an intersection ridge line between the rake face and the flank, wherein a locus of rotation of the main cutting edge is formed when the holder is rotated around an axis of the holder, wherein the locus of rotation, comprises a middle part and end parts on both sides of the middle part in a holder axial direction parallel to the axis of the holder, the end parts comprising a tip end part and a base end part which is positioned further away from a tip of the holder in the holder axial direction than the tip end part, wherein the middle part projects further outward in a holder radial direction perpendicular to the holder axial direction than the end parts, and wherein the middle part has a farthest portion which projects farthest outward in the holder radial direction and which is closer to the tip end part in the holder axial direction than the base end part or is at an intermediate position in the holder axial direction between the tip end part and the base end part.