Abstract: A device for testing a specimen for the purpose of ascertaining strength of an edge or hardness of a surface employs a pivoted rocker arm whose two extremities are interactive with voice coils that impart a controlled torque and velocity to the rocker arm. A diamond indenter and a linear variable differential transformer displacement gauge (LVDT) are also attached to the rocker arm, The torque produces a corresponding force on the indenter. A holder positions the specimen opposite the indenter, The degree of indentation produced in the specimen at two different force levels is measured by the LVDT.

Abstract: The present invention provides an adjustable blade sharpening apparatus for sharpening cutting blades by controlling the positioning of the blade relative to the grinding wheel to produce multiple facets on the cutting blade with a substantially burr-free cutting edge and method of controlling the angle of and position of a blade employing the blade sharpening apparatus. The blade sharpening apparatus comprises a fixed base supporting a table surface including a vertically mounted rotary grinding wheel mounted on an axle and having a circumferential peripheral cutting edge.