Milling cutter

A milling cutter, comprising:

• a cutter body having a ring-shaped structure, an inner peripheral surface, an axial direction, a circumferential direction, and side portions of said inner peripheral surface;
• a plurality of first tips disposed on said inner peripheral surface of said cutter body along the circumferential direction, said plurality of first tips having a distance between adjacent ones thereof and cutting edges, and said plurality of first tips being adapted to perform rough cutting work on a pin and a journal of a work and journal thrusts at ends of the journal;
• a plurality of second tips disposed on said side portions of said inner peripheral surface of said cutter body along the circumferential direction and having a distance between adjacent ones thereof, said plurality of second tips being adapted to perform rough cutting work on side surfaces of counterweights disposed at end sides of the pin and the journal of the work;
• and
• a flat drag disposed on an inner peripheral portion of said cutter body and adapted to perform flat cutting work on said journal thrust, said flat drag having a cutting edge;
• wherein said flat drag has a cutting edge and is positioned with respect to said cutter body such that a deviation of said cutting edge of said flat drag in said axial direction is maximized with respect to deviations of said cutting edges of said plurality of first tips, said cutting edge of said flat drag having a round shape satisfying the equation R>f.sup.2 .multidot.z.sup.2 /8Hth, where f is a feed per one flat drag, z is an effective cutting edge number, R is a nose radius of said flat drag and Hth is a surface roughness.