■ Micrographs of Microscopically-Examined    Surface (×200) ■ Profile grinding conditions : ㆍAmount moved : 0.7mm(3×0.02mm+1×0.01mm/bolt ways) ㆍSpeed : 3.0mm/min ㆍGrinding stone : #400 Ф75 ㆍGrinding stone revolutions : 3600rpm ㆍNumber of strokes : 85 times/min ㆍAmount of strokes : 27mm ■ Micrographs of the DF    and Other(×1500)