Patent ID: 6976815

Claim:
A milling cutter comprising a body having three cutting edges formed by the body, and a fastening end, each cutting edge being continuously curved from an outer periphery of the body substantially to a center rotational axis of the body along a substantially convexly curved path, wherein radially outer and radially inner ends of each cutting edge being situated axially rearwardly of an axially foremost point of the cutting edge, each cutting edge lying substantially on a respective imaginary sphere having a center spaced from the cutting edge in a direction toward the fastening end and spaced radially from the center axis; each cutting edge defined by an intersection of a clearance surface and a chip surface of the body, each clearance surface being convexly arch-shaped and having two radially-extending clearance edges that continuously converge towards one another as they extend from the outer periphery substantially to the axis as viewed along the axis.