A method representing crystallographic orientation of single crystal diamond tool on the Mercator map is proposed. Properties of single crystal diamond tools have been studied. Experimental results of cutting by diamond tools oriented various crystallographic direction lead to the following conclusions. On the cutting aluminum alloy, the minimum cutting forces and the minimum coefficient of friction between the tool-chip interface take place on the tool whose rake face is identified with the {110} plane and whose inverse direction of cutting edge is coincided with <100> direction. To the tool equipped with low frictional rake face, the chip flows straight and adheres lightly to the face. On the other hand, to the high frictional one, the chip curves and adheres heavily.
