Abstract: A method for detecting the local and overall distribution of tension in saw blades involves elastically deflecting a properly-tensioned model blade, which is loose in the center, into a compound curvature in the form of a saddle, and adjusting the amount of deflection until the blade surface becomes flat and rectilinear along one of two perpendicular axes of the deflection. Any similar blade of unknown tension which is to be treated is then subjected to the same deflection, and inspected for rectilinearity along the same axis of deflection. Any regions projecting from this axis contain excess tension, and are designated for hammering to loosen them. The blade is rotated while the deflection axes remain stationary, so that the local and overall tension levels in the entire blade may be conformed to those of the model blade.

Abstract: A method and machine for hammering circular saw blades automatically, to correct uneven distributions of residual stresses, and distortions of the blade surfaces from true planes, so that the blades will run true. This operation has previously only been performed manually, by highly-skilled craftsmen. The saw blade is elastically deflected so that its normally-planar surface lies in a curved surface of a predetermined contour. A proximity sensor passes over the blade to detect deviations of its surface from the predetermined contour, which occur at points of uneven stress distribution or surface distortion. At such points, the blade is arrested and hammered until the fault is corrected.

Abstract: A method and machine for hammering circular saw blades automatically, to correct uneven distributions of residual stresses, and distortions of the blade surfaces from true planes, so that the blades will run true. This operation has previously only been performed manually, by highly-skilled craftsmen. The saw blade is elastically deflected so that its normally-planar surface lies in a curved surface of a predetermined contour. A proximity sensor passes over the blade to detect deviations of its surface from the predetermined contour, which occur at points of uneven stress distribution or surface distortion. At such points, the blade is arrested and hammered until the fault is corrected.

Abstract: A flexible base metal strip has a strong, tough and adherent abrasive armoring coating produced thereon in situ from abrasive particles of hard, high melting material selected from the group consisting of metal carbides, borides, nitrides, silicides and combinations thereof, and particles of a matrix metal, said matrix metal particles being in said armoring coating and fusion bonded to each other, to the base metal strip and to the abrasive particles to anchor and partially embed the abrasive particles therein with the particles projecting therefrom in the form of a series of sharp cutting edges. When such a strip is provided at one end with a suitable handle, it forms a convenient hand file and its flexibility permits use in a variety of situations. Attachment means may be provided at each end of the coated strip as shown in a co-pending application for attachment of the strip to a suitable frame such as a standard hack saw frame.