Cutting insert and toolholder for holding the same

A toolholder assembly comprised of:

• I) a cutting insert with of an insert body having:
• a) a top surface and a bottom surface;
• b) sides between the top surface and the bottom surface, wherein the sides are comprised of core sides and tip sides;
• c) top edges at the intersection of the top surface with the sides;
• d) bottom edges at the intersection of the bottom surface with the sides;
• e) a core defined by two pairs of core sides, wherein each pair has a first core side and a second core side and wherein the top edge of each pair of core sides forms a core angle with one another;
• 1) wherein, in a plan view, the top edge of the first core side of one pair is parallel to top edge of the first core side of the other pair;
• 2) wherein, in a plan view, the top edge of the second core side of one pair is parallel to top edge of the second core side of the other pair;
• f) a first cutting portion and a second cutting portion, each extending from the core, wherein each cutting portion is comprised of:
• 1) a pair of tip sides having top edges converging at a tip angle to form a cutting tip;
• and
• 2) a bisector line bisecting the tip angle;
• g) wherein, in a plan view, the bisector lines of the first cutting portion is offset from and parallel to the bisector line of the second cutting portion, and
• h) wherein the tip angle is less than the core angle;
• and
• II) a toolholder for supporting the cutting insert, wherein the toolholder is comprised of:
• a) a body having a front end;
• b) a pocket with a floor and walls extending rearwardly from the front end of the body, wherein the pocket has a core region that conforms to and provides support to the insert core;
• c) wherein two walls in the core region conform to and provide support to two sides of the insert core;
• d) wherein the floor in the core region is conform to and provide support to the insert core;
• e) wherein the pocket further includes a recess extending rearwardly from the core region and of sufficient area to encompass one cutting tip of the insert when the insert is mounted within the pocket;
• f) wherein the core region of the pocket terminates at the front end of the body such that, with the insert positioned within the pocket, one cutting tip extends beyond the front end of the toolholder while the other cutting tip is encompassed by the pocket recess.