Abstract: A novel hob construction includes a plurality of blades and a cylindrical main body having opposite axial ends. Flanges including axially aligned slots for receiving the blades are located only upon the ends of the main body. A chocking material is provided over the circumferential extent of the main body and between the blades for forming an effective physical extension of the body for bonding the blades to the body and to each other.

Abstract: An inserted-blade cutter assembly uses a laterally projecting finger formed integrally with each removable blade which is engagable with a reference-positioning surface on the cutter body to precisely position the blade. Two locking caps have frustoconical surfaces which engage similarly shaped end portions of the blade members providing a sufficient radial force to counter centrifugal forces and thereby retain the blades in the body member. The locking caps also provide a sufficient axial force to keep the blade finger in contact with the reference-positioning surface to provide precise cutting tooth alignment during the cutting operation. This structure obviates the need for individual fasteners, shrink fits, or adhesives thereby facilitating blade removal and replacement.