Miniature cutting insert holder

Apparatus for machining a workpiece, which includes a holder having an axis extending in front and rear directions and having a holder front mating end, and a head with a rear mating end fixed to said holder front mating end, said head forming a pocket and including a cutting insert mounted in said pocket, wherein:

• said holder front mating end and said head rear mating end are constructed with one having a projection and the other having a recess that closely receives the projection, to accurately locate the head and the cutting insert thereon with respect to the holder;
• said projection and recess each having interfitting surfaces that each extends precisely parallel to said axis as seen in each of two perpendicular sectional views that are each taken perpendicular to the axis.

Apparatus for machining a workpiece, which includes a holder having an axis extending in front and rear directions and having a holder front mating end, and a head with a rear mating end fixed to said holder front mating end, said head forming a pocket and including a cutting inset mounted in said pocket, said holder font mating end and said head rear mating end each have outside surfaces that are exposed even when said holder and head are fixed to each other, wherein:

• said holder front mating end and said head rear mating end are constructed with one having a recess and the other having a projections that fits closely in the recess;
• as viewed along said axis, the recess and projection each extends along a closed continuous curve that is spaced inward of said exposed outside surfaces.