EINSTELLBARE BOHRSTANGE

An adjustable boring bar characterized in that the bar has a transverse bore in which the overlapped shank portions of a pair of cutter elements are simultaneously moved radially outward or inward with respect to the longitudinal axis of the bar by screw actuated cam means which engages inclined surfaces of the respective shank portions. The screw actuated cam means comprises a nut movable in another transverse bore in the bar by rotation of a dial screw, said nut having an inclined cam face which engages a cam plunger which is longitudinally movable in a central longitudinal bore in the bar, said plunger having a V-shaped tongue which engages the respective inclined surfaces of the shank portions of the cutter elements. The adjustable boring bar herein is further characterized in that the cutter elements are of T-shaped configuration with the shanks overlapped as aforesaid in a transverse bore in the bar and with the crossbar portions guided and supported by integral shoulders formed on the bar, the cross bar portions having provision for mounting of carbide or like inserts.