Abstract: An assembly for testing the rolling contact fatigue of a test material including a collet for mounting the test material, spherical bearings for rolling contact with the test material, and a support structure for supporting the mounting collet and the spherical bearings for relative rotation therebetween. The assembly is characterized by the support structure including a pair of adjustable race members, each having an inclined or frustoconical surface in rolling contact with the spherical bearings for applying an adjustable predetermined force against the spherical bearings to force the bearings into rolling contact with the test material.

Abstract: A quantitative magnetic separator and method for isolating non-magnetic particles from contaminated magnetic powder mixtures to determine the relative purity of magnetic powder. The separation is effected by restraining the powder mixture below a relatively moving magnetic field which agitates the magnetic particles and allows the non-magnetic particles to disengage and free-fall by gravity into a receiver for subsequent measurement of the degree of contamination.

Abstract: A hardness testing device of the type adapted to measure the hardness of workpieces by indentation of the surface stratum thereof by an indenter or penetrating device. The depth of penetration of the workpiece under a prescribed load applied to the penetrating device is proportional to the hardness of the workpiece, which in turn is visually and/or audibly communicated by a variable fluid flow sensing system associated with the penetrating means. The testing device is readily adapted for automatic operation to test individual workpieces at commercial production rates to assure they are within prescribed quality and/or hardness limits.