Patent ID: 8141464

Claim:
A milling cutter of a crank shaft miller which performs machining processing upon a side surface of a counter weight and upon an outer circumferential surface of a pin journal, comprising: a cutter body; and a first cutter tip which is detachably attached to said cutter body, wherein the first cutter tip has front and back surfaces, which are opposite to each other, and said cutter tip has an approximate shape of an hourglass and is narrower at its middle than at its ends as seen when facing said front surface and said back surface, and all corners of said first cutter tip located on said front surface and said back surface are set to acute angles as seen when facing said front surface and said back surface, and said front and back surfaces are perpendicular to a rotating direction of said milling cutter, and a plurality of second cutter tips, which are detachably attached to said cutter body, wherein each second cutter tip has front and back surfaces, which are opposite to each other, and said each of the second cutter tips has an approximate shape of a parallelogram as seen when facing said front surface and said back surface of said second cutter tips, wherein said second cutter tips include a side cutter tip, which performs cutting of the side surface of said counter weight, and horizontal outer circumferential cutter tip, which performs cutting of the side surface of said counter weight and the outer circumferential surface of said pin journal.