Patent ID: 6871859

Claim:
A toolholder and insert, comprising: an insert having a front cutting portion and a rear shank portion at a base of the cutting portion, the insert defining a longitudinal center axis; and a toolholder having a rear first end attachable to a spindle and a front second end having a shank-receiving opening; wherein, when the shank portion is not disposed in the shank receiving opening and the toolholder is at an ordinary room temperature, the shank-receiving opening is smaller than the shank portion, and upon heating of the toolholder to a predetermined temperature above the ordinary room temperature and above an ordinary operating temperature the shank-receiving opening expands to become at least as large as the shank portion and, upon cooling of the toolholder to a temperature below the predetermined temperature and after insertion of the shank portion in the shank-receiving opening, the shank-receiving opening shrinks to generally conform to a shape of the shank portion; wherein there projects rearwardly at a rear end of the shank portion remote from the cutting portion a first integrated engagement portion, and the shank-receiving opening includes a second integrated engagement portion in which the first engagement portion is received, wherein the first and second engagement portions extend generally longitudinally and are arranged to prevent rotation of the insert relative to the toolholder about the axis.