Patent ID: 8500518

Claim:
Method of grinding an indexable insert having narrow sides contiguous with first and second wide sides, comprising moving the narrow sides along a circularly contoured surface of a rotating grinding wheel whereby the narrow, sides are ground by the grinding wheel, wherein movements (a), (b) and (c) as follows are coordinated with respect to each other: (a) the indexable insert is rotated about a rotational axis which is substantially perpendicular to a plane of symmetry of the indexable insert; (b) a grinding spindle that carries and rotates the grinding wheel and the rotational axis of the indexable insert are displaced relative to each other in two displacement axes that are perpendicular to each other, the displacement axes and the rotational axis of the indexable insert being in parallel planes or the same plane; and (c) the grinding spindle and the indexable insert are pivoted relative to each other about a pivot axis that is perpendicular to the plane or planes in which the displacement axes and the rotational axis are located; wherein the relative movement of the grinding wheel occurs along geometric determination lines at each of the pivoted positions of the grinding spindle carrying the grinding wheel and the indexable insert that are pivoted relative to each other about a pivot axis that is perpendicular to the plane or planes in which the displacement axes and the rotational axis are located until grinding thereof is complete, said geometric determination lines being continuous with and collinear with the surfaces of each of the narrow sides of the indexable insert and parallel to the advancing direction and rotational axis of the grinding wheel; the grinding is longitudinal, wherein the circularly contoured circumferential surface of the rotating grinding wheel and the indexable insert are guided relative to each other so that the circularly contoured circumferential surface of the grinding wheel traverses the narrow sides of the indexable insert beginning at the first wide side to the second wide side; and during the longitudinal grinding a forward-tapering leading area of the grinding wheel that is angularly displaced from a surface of the indexable insert when in contact therewith rough grinds the narrow sides of the indexable insert and a cylindrically shaped trailing area of the grinding wheel, which is annexed to the leading area and is disposed behind the leading area during the longitudinal grinding, linearly contacts the narrow sides thereby to finish grind the narrow sides.