FIELD: working parts in metal cutting machine tools.
SUBSTANCE: apparatus includes clamping chuck mounted in working zone of machine tool; holder of worked part put onto chuck and forced to it; first and second positioning members provided respectively onto clamping chuck and onto part holder and mutually engaged in such a way that to detect position of part holder in three coordinate system and its angular orientation. Clamping mechanism provides securing of part holder to claming chuck in predetermined position. First positioning members are in the form of cone centering pins; second positioning members are in the form of double-step groove having two shoulders. Edges of shoulders extending towards inner side of groove are mutually spaced by distance less than width of cone centering pins measured in position of their touching shoulder edges in time moment of forcing part holder to clamping chuck.
EFFECT: possibility for increasing resistance against tilting and torsion moments occurred at working part. 14 cl, 9 dwg
