Patent ID: 8496413

Claim:
End mill comprising an even number of main cutting edges helically extending along the circumference of the mill, said main cutting edges alternately having a relatively smaller and a relatively larger helix angle relative to an axis of the mill, the odd-numbered main cutting edges being defined by forming said smaller helix angle with the axis, wherein immediately at a frontal end circumferential angular distances of the main cutting edges following one after another in a rotational direction between the odd-numbered main cutting edges and the successive even-numbered main cutting edges are smaller than the circumferential angular distances between said even-numbered main cutting edges and said successive odd-numbered main cutting edges, wherein all circumferential angular distances at the frontal end of the mill differ from one another, and wherein the circumferential angular distances between the main cutting edges at the front end of the mill and the different helix angles are selected such that along the further axial course of the main cutting edges the circumferential angular distances between the main cutting edges in each axial position take at least two different values and that in at most a total of three different axial positions at least two circumferential angular distances are identical, while in all other positions all circumferential angular distances differ from one another.