Patent ID: 7544020

Claim:
A pin milling cutter for cutting crankshafts having a cutter with a cutting section on an inner perimeter or an outer perimeter of a ring-shaped main cutter body and an adapter supporting said cutter are formed with engagement projections and cavities aligned to each other and positioned at mutually fitting sections at a fixed pitch along a circumference to provide tapered fitting so that said cutter and said adapter can be removably combined concentrically, comprising: a mechanism configured to prevent a different type of cutter from being mistakenly fit to said adapter, said mechanism being disposed on said main cutter body and said adapter, said mechanism comprising one radial projection and a plurality of grooves corresponding to said projection, wherein either said radial projection or said groove being formed on a fitting section on a cutter side while a remaining element is formed on a fitting section on an adapter side, wherein said plurality of grooves are formed at a pitch at which said engagement projections and cavities are formed or a pitch that is an integer multiple thereof, wherein said radial projection is at least one of a removable cap screw or a removable pin, and wherein an attachment position of said radial projection on the fitting section can be changed.