2.—An expanding reamer. with machine reamers there is an advantage in having a slight clearance behind the cutting edges, hence the reamer illustrated herewith is provided with such clearance.

Chamfer relief angle: The chamfer relief angle is the axial relief ... Excessive speed; • Too much clearance on reamer; • Lack of rigidity in jig; • Insecure holding of work; • Excessive overhang of ...