Indexable insert for grooving tools

In an indexable insert grooving tool having a shank having spaced ends, one end mountable in a slide and a head at its other end, there being a pocket in said head including a pair of bottom edges and a back up wall, said bottom edges defining an included obtuse angle in the range of about 130.degree. to 150.degree. and whose one side defines said back up wall;

• the improvement comprising:
• an indexable insert nested in said pocket bearing against said back up wall and secured therein;
• said insert including an elongated body of general rectangular cross section and having spaced ends;
• a normally flat top surface across one edge of the body;
• and a pair of angular bottom surfaces extending from a central point of the body lengthwise thereof and inclined toward and extending to adjacent said top surface at an included obtuse angle corresponding to the angle between said pocket bottom edges;
• said bottom surfaces terminating in end faces which extend to and define with said top surface a pair of separately usable transverse cutting edges at opposite ends of said body, said body adapted for snug registry within said pocket, one end of said body projecting from said head.

In an indexable insert grooving tool having a shank having spaced ends, with a longitudinal axis and at one end mountable in a slide, and a head on the other end of said shank and laterally displaced therefrom, said head having a flat top surface coplaner with said axis;

• there being a pocket in said head below said top surface including a pair of bottom edges and a back up wall, said bottom edges defining an included obtuse angle of 140.degree. approximately and whose one side defines said back up wall;
• one bottom edge being inclined upwardly and inwardly into said head below said top surface and the other bottom edge being shorter than said one bottom edge and terminating at the side of the head below said top surface;
• and an indexable insert snugly nested within said pocket bearing against said back up wall and secured therein;
• said insert including a body of general rectangular cross section and having spaced ends;
• a normally flat top surface along one edge of said body coplaner with said head top surface;
• and a pair of angular bottom surfaces extending from a central point of the body and inclined toward and extending to adjacent said top surface at an included obtuse angle corresponding to the angle between said pocket bottom edges, said bottom surfaces termnating in end faces which extend to and define with said top surface a pair of separately usable transverse cutting edges at opposite ends of the body, said body adapted for snug registry within said pocket, one end of said insert projecting laterally of said head adapted to cut an annular groove within the bore of a workpiece rotating on an axis corresponding to the axis of said shank.