Boring bar and an elongated boring bar insert having boring tools at opposite ends

Claim 1

The combination of a boriNg bar and an elongated boring bar insert, said boring bar having boring tools at opposite ends thereof positioned at an angle of 180* to each other, said boring bar having a first transverse recess with a rectangular cross section opening outwardly in an axial direction of said boring bar and extending at right angles to an axis of rotation of said boring bar and adapted to receive said boring bar insert therein, said boring bar insert having a rectangular cross section, a clamping screw on said boring bar extending at a right angle to and into said first transverse recess, a second transverse recess opening outwardly in said axial direction of said boring bar, a centering wedge having a trapezoidal cross section, said second transverse recess being partly defined by a groove in an axially facing surface of said boring bar and partly by a groove in an axially facing side face of said boring bar insert which is parallel to said axially facing surface on said boring bar, both of said grooves having a trapezoidal cross section, a screw extending in a direction parallel to said axis of said boring bar, an axis of said screw intersecting the longitudinal axis of said groove, a pair of oppositely facing surfaces on said trapezoidal shaped centering wedge engaging opposed surfaces in both of said trapezoidal shaped grooves, said oppositely facing surfaces of said centering wedge being forced into engagement with said opposed surfaces of both of said grooves by said screw.