Sharp knife coin circulate range of area relatively wide , and area there are remarkable space differences, the forming and development of this circulation area have close contacts with distribution pattern of national geography in the Spring and Autumn and the Warring States Periods.

The preparation technologies of monocrystal diamond pointed cutters,including design of geometry parameters,selection of material,crystal orientation,incision,sharping,clamping,coarse grinding,finishing grinding and polishing are introduced.

The ultra-precision cutting is of the interaction between knifepoint geometry of the tool and work-piece.