초록 ▼

A spotting drill and milling cutter (10) having a shank (30) and a pocket (50) for receiving an insert (52). The cutter is capable of forming a spotting hole (12) having a concentric circular cavity (16) at the bottom of the spotting hole. Insert (52) includes a primary cutting edge (54), a secondar

A spotting drill and milling cutter (10) having a shank (30) and a pocket (50) for receiving an insert (52). The cutter is capable of forming a spotting hole (12) having a concentric circular cavity (16) at the bottom of the spotting hole. Insert (52) includes a primary cutting edge (54), a secondary cutting edge (64) and a tertiary edge (68) having a cutting portion (68a). The primary cutting edge terminates at a point (56) which is radially offset about 0.001" to 0.100" with respect to rotation axis (36) of the cutter. Primary radial relief surface (76) associated with the primary cutting edge and secondary radial relief surface (78) associated with the secondary cutting edge are provided to reduce back dragging relative to the primary and secondary cutting edges.

대표청구항 ▼

[ What is claimed is:] [1.]1. A spotting drill and milling cutter comprising:a. a shank having an insert pocket and a rotational axis; andb. an insert mounted in said pocket, said insert having a primary cutting edge and a secondary cutting edge, said primary cutting edge having a point that is radi

[ What is claimed is:] [1.]1. A spotting drill and milling cutter comprising:a. a shank having an insert pocket and a rotational axis; andb. an insert mounted in said pocket, said insert having a primary cutting edge and a secondary cutting edge, said primary cutting edge having a point that is radially offset with respect to said rotational axis, said insert further including a primary radial relief surface associated with said primary cutting edge.