Patent ID: 6997651

Claim:
An end mill, comprising: a cylindrical body having (a) a plurality of flutes each of which is formed in said cylindrical body and each of which extends from an axially distal end of said cylindrical body toward an axially proximal end of said cylindrical body, (b) a plurality of peripheral cutting edges each of which is provided by one of widthwise opposite edges of a corresponding one of said plurality of flutes, and (c) a plurality of end cutting edges each of which is located at said axially distal end of said cylindrical body and is contiguous to a corresponding one of said plurality of peripheral cutting edges, wherein said plurality of end cutting edges include first and second end cutting edges, said plurality of peripheral cutting edges include first and second peripheral cutting edges which are contiguous to said first and second end cutting edges, respectively, said first and second end cutting edges have a predetermined first axial rake angle and a predetermined second axial rake angle, respectively, said first and second peripheral cutting edges have a predetermined first radial rake angle and a predetermined second radial rake angle, respectively, and the predetermined first axial rake angle of said first end cutting edge is smaller than the predetermined second axial rake angle of said second end cutting edge, the predetermined first radial rake angle of said first peripheral cutting edge is larger than the predetermined second radial rake angle of said second peripheral cutting edge.