Patent ID: 7588396
Filing Date: 2009-09-15
Classification: B23C,Y10T

Abstract:
1. An end mill having an axis of rotation, comprising: a shank section extending along the axis of rotation; a fluted section extending along the axis of rotation, having a first end integrally attached to the shank section, a second end, and a diameter; and a plurality of helical teeth disposed within the fluted section, each having a cutting edge, a relief wall, a cutting surface, and an edge preparation surface disposed contiguous with the cutting edge, and between the relief wall and the cutting surface, wherein the cutting surface is positioned relative to the cutting edge to contact a work piece chip as the chip is separating from a work piece at the cutting edge; wherein the relief wall has a first surface finish, the cutting surface has a second surface finish, and the edge preparation surface has a third surface finish, and the third surface finish is smoother than the first and second surface finishes; wherein edge preparation surface includes a primary section and a secondary section, and the primary section is contiguous with the cutting edge and the secondary section is contiguous with the primary section.