Patent ID: 7357603

Claim:
A toolholder comprising: a) a cutter body rotatable about a central axis; b) a peripheral wall on the cutter body; c) insert pockets located in the peripheral wall, wherein each pocket is spaced from an adjacent pocket by a lug and wherein each pocket has support surfaces including a bottom surface adapted for positioning a rectangular insert within a predefined rectangular envelope within the pocket; d) wherein each rectangular envelope has a front and back and four sides therebetween, including a top side, a bottom side and a radially inward side; e) wherein each lug has: 1) a radial width; 2) a front face extending upwardly from the pocket bottom to the top of the lug; 3) an axial face extending downwardly from the top of the lug to a height below the top of the lug; and 4) a rear face extending from the axial face downwardly to the bottom surface of an adjacent pocket, f) wherein the support surfaces of the pocket are defined by the lug front face, the bottom surface, and a pocket wall positioned radially inwardly from the peripheral wall and connecting adjacent lugs; g) wherein the lug axial face is sloped downwardly across the entire lug width from the top of the lug to the lug rear face, thereby providing a chip clearance groove across the entire width of the lug; and h) wherein the lug front face extends over the back of the insert envelope.