Patent ID: 6896450

Claim:
A machine reamer comprising a shaft-like base body, and a reaming head projecting axially from an end face of the base body, said reaming head comprising a one-piece exchangeable cutting tip including a shoulder which projects axially beyond a rearward facing planar surface and having thereon at least three key surfaces which are arranged at angular distances from one another, and supplement one another to form a regular frustum, the exchangeable cutting tip configured to be chucked in an auto-centering manner into an end face of a radially expandable tip seat of the base body, the tip seat having at least three inclined surfaces which are arranged at angular distances from one another, and are complementary to the key surfaces of the flat sides of the regular frustum, and terminate in a planar end surface against which axially abuts the rearward facing planar surface of the exchangeable cutting tip in an assembled state, wherein the exchangeable cutting tip is chucked in the tip seat by a member extending axially centrally into the base body.