Patent ID: 8807888

Claim:
A tool shank for use with a cutting insert in a rotary cutting tool, the tool shank comprising: a body having, and adapted to be rotated about, a central longitudinal tool axis, the body having a tip portion structured to receive at least a portion of the cutting insert therein; a pair of chip flutes formed in the body; and a pair of recesses, each recess bordering a respective chip flute, each recess having: a rim portion extending perpendicular to the tool axis, and a bearing surface extending at an incline relative to the tool axis, wherein each rim portion is adapted to engage a corresponding surface on the cutting insert, wherein each bearing surface is adapted to engage a corresponding bearing surface on the cutting insert in a manner such that the cutting insert is pulled against the body when the rotary cutting tool is rotated about the tool axis, and wherein each chip flute is disposed at a twist angle and wherein each bearing surface is inclined at an angle corresponding to the twist angle.