A relatively simple and rapid method for preparing highhyphen;quality electron microscope disk specimens from electrically conductive and nonconductive brittle bulk materials is described. The technique utilizes a model 2ndash;334 Raytheon ultrasonic impact grinder to generate and transmit high frequency vibrational energy through a tubehyphen;shaped tool tip to an abrasivehyphen;water slurry circulated over the bulk material. Machining is accomplished by the abrasive particles resonating and impacting the bulk material in a vertical plane below the tool tip. The net effect produces a microscopic grinding action on the workpiece that parallels the contour of the end of the tool tip.
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