PROBLEM TO BE SOLVED: To provide a minor diameter CBN end mill in a new shape capable of performing the cutting of a high-hardness material such as a precision component with high accuracy and efficiency for a long time without the occurrence of abrasion and chipping, and especially to provide a minor diameter CBN square end mill and a radius end mill with an edge diameter of 3 mm or less.;SOLUTION: A minor diameter end mill in which a part of cemented carbide material integrally sintered to a CBN sintered material is inserted and fixed to a shank hole part is provided with a cutting edge on its tip with an edge diameter of 3 mm or less. In the minor diameter CBN end mill, a peripheral cutting edge is formed so as to be a right edge torsional to left, and at least 60% of the peripheral cutting edge, desirably whole of it, is formed by a gash. The axial rake of the cutting edge at the tip of the end mill is -5° to -25°, and further desirably the radial rake of the tip of the cutting edge is +10° beyond -5°.;COPYRIGHT: (C)2010,JPO&INPIT
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