Patent ID: 7815402

Claim:
A cutting insert for a radius cutter removably mounted on a tool body, the cutting insert for the radius cutter comprising a seating surface, a rake face opposed to the seating surface and configured to be oriented in a direction of rotation of the tool body when mounted on the tool body, and a flank face formed between the seating surface and the rake face, wherein an intersection between the rake face and the flank face includes a cutting edge portion composed of a circular-arc cutting edge in the form of a substantially quarter circular arc, located on the outer periphery of the distal end of the tool body, and an outer cutting edge continuous with one end of the circular-arc cutting edge and extending substantially parallel to an axis of the tool body, and a portion recessed a predetermined distance inwardly from the cutting edge portion of the rake face projects on the rotation-direction side of the tool body from the cutting edge portion.