Patent ID: 6761514
Filing Date: 2004-07-13
Classification: B23B,Y10T

Abstract:
A hollow mill tool comprising a shank portion and a plurality of radially spaced and axially extending tool posts integrally formed with and projecting from said shank portion about a longitudinal axis of said tool, each of said tool posts having a longitudinal cutting insert mounting face, each mounting face defining a first plurality of axially extending serrations, a cutting insert mounted on each mounting face, each cutting insert having a cutting edge which defines a cutting cylinder upon rotation about said longitudinal axis, each cutting insert having a second plurality of axially extending serrations defining a back face and intermeshing with said first plurality of serrations, a threaded fastener extending through a front face of each said cutting insert and being received in each cutting insert mounting face of said tool posts to securely hold each cutting insert against its tool post,wherein each cutting insert has a trapezoidal transverse cross section, the back face and the front face of each cutting insert are parallel, the back face and the front face of said cutting insert are connected by first and second side faces, said side faces forming acute angles with said front face at a longitudinal intersection defining a cutting edge, and each cutting edge defines a line lying in a plane tangent to a cutting cylinder and wherein said cutting cylinder has a diameter corresponding to an outside diameter of a workpiece machined to a tolerance of Â±0.001 inch by said mill tool.