Abstract: A curved slot is formed between an internal cavity of an airfoil and the trailing edge thereof by temporarily deflecting the airfoil trailing edge portion toward the suction side thereof, forming a straight slot in the trailing edge portion while it is in the deflected position, and releasing the deflecting pressure to allow the trailing edge portion to spring back into an unstressed condition so as to thereby curve the slot within the trailing edge portion. Further curvatures may be effected by subsequent reformation of the trailing edge portion toward the pressure side of the airfoil.

Abstract: A liner element for a housing of a rotary piston machine is manufactured from a flexible metal strip and is deformed for example by pressing on one side thereof such that when the liner is assembled in a semi-cylindrical bore in the housing, the inner surface of the liner element has a trochoidal shaped surface to receive the rotor of the rotary piston machine.

Abstract: A method of forming a pair of identical spherical mirrors having their centers of curvature separated in space. A blank having substantially parallel planar front and rear surfaces is provided. The front surface is scored to divide it into two surface segments. The entire front surface is then ground to a spherical shape. The blank is then bent along the scored region to separate in space the centers of curvatures of each of the surface segments.The foregoing abstract is not to be taken either as a complete exposition or as a limitation of the present invention. In order to understand the full nature and extent of the technical disclosure of this application, reference must be had to the following detailed description and the accompanying drawings as well as to the claims.

Abstract: An elongated workpiece is passed along an arcuate path defined by a pair of end rollers flanking a middle roller. At least one of the rollers is formed with a workpiece-receiving groove having flanks at least one of which has a milling formation for removing ridges that form on a workpiece passing along the arcuate path between the rollers. Thus, these ridges that form inherently on a workpiece that is bent are removed during the bending thereof to prevent the workpiece from jamming in the bending rollers.