Stump grinding bit and tip therefor

A rotary stump cutter comprising:

• a rotary member;
• holders mounted on the member, each holder forming a bore extending generally tangentially relative to an axis of rotation of the member;
• and
• a cutting bit mounted in each bore and comprising:
• a shank having a mounting portion disposed in the bore and rotatable relative to the holder about a longitudinal axis of the bore, the shank further including a front head portion, the head portion including a front face having a center post projecting axially from the front face, and a generally circular lip projecting forwardly and extending around an outer periphery of the front face, wherein the front face and the lip form a pocket surrounding the post, the post extending forwardly past the pocket;
• and
• a cutting tip brazed in the pocket, and comprising a body formed of a harder material than the shank, the body having a front cutting surface, a rear supporting surface engaging the front face of the shank, and a side surface extending between the supporting surface and the cutting surface, the lip engaging the side surface with a thermal shrink fit, an outer peripheral portion of the cutting surface and a forward portion of the side surface intersecting one another at substantially a ninety degree angle to form a generally circular cutting edge, an inner portion of the cutting surface disposed radially inwardly of the outer peripheral portion and being recessed relative to the outer peripheral portion thereof, and a center hole extending through the body from the cutting surface to the supporting surface and receiving the post.