Method of and a device for positioning a cutting tool on a tool rest of a machine tool

Claim 1

A gauge device for correctly orienting and/or positioning a machine cutting tool on a tool holder of a machine tool rest such as on an automatic lathe, comprising a gauge plate carrier with means for detachably mounting on said tool holder at a predetermined position, said gauge plate carrier having a turretshaped body provided with opposed end surfaces and provided with a plurality of radial slots at equi-angular intervals on one of its end surfaces for respectively receiving a plurality of gauge plates therein; said gauge plates each secured in one of said radial slots by means of a pair of coacting wedges and a set screw, said wedges being relatively radially adjustably disposed within an enlarged portion of each of said slots and held in operative frictional engagement with said tool gauge plate, and against which gauge plate the cutter tool to be positioned is complementally engaged to effect its correct orientation with respect to said tool holder; a central shaft projecting outward from the carrier body end surface opposite to that having said radial slots, said shaft having an annular circumferential Vgroove formed in a medial portion of said central shaft and adapted to be introduced into a hole provided in a predetermined location in said tool holder to effect its rigid securing to said tool holder by engaging one of the V-groove faces with a complementally shaped conical end portion of a set screw adjustably threaded in said tool holder transversely to said central shaft; a positioning pin to be secured in a predetermined gauge-plate-carrier-engaging position on said tool holder; and a plurality of notches provided radially about said central shaft in said gauge plate carrier and on its same end surface from which said central shaft protrudes, said notches corresponding in number to the number of gauge plates and selectively individually engaging with said positioning pin to correctly position a preselected gauge plate relative to said tool holder.