Abstract: A method of making a shock-resistant and wear-resistant composite steel tool comprises providing a steel tool body having a working edge, and providing a working part material of nonporous wrought steel in an unhardened state which is hardenable to a hardness greater than that of the body. The working part material, in its unhardened state, is fused by welding to the working edge of the tool body while being pressed forcibly against the working edge. After the fusion step, the outer surface of the working part material is hardened to a hardness greater than that of the body of the tool, the depth of penetration of such hardening being limited to the region immediately adjoining the outer surface of the material so that the underlying region of the working part remains ductile, and the weld is normalized thereby increasing its ductility and resultant shock resistance.

Abstract: An adjustable wobble dado assembly has a planar circular blade with spaced peripheral cutting teeth. The cutting teeth have respective top cutting edges at their radially outer extremities which are located at progressively different radial distances from the axis of the blade so that, when the axis is tilted relative to the arbor for purposes of cutting a groove, those top cutting edges located at progressively greater radial distances from the axis cut portions of the groove located progressively further from the longitudinal center of the groove. The top cutting edges also have respective different top angles relative to the axis of the blade, those edges located at progressively greater radial distances from the axis having progressively greater top angles relative to the axis. An adjustable hub assembly includes a hub composed of an integral portion of the material of the blade having a thickness greater than that of the blade.