Technical requirements:
1. the surface roughness of the tool tip and cutting edge is less than 0.01μm
2. Straightness within the cutting edge is less than 0.01μm, and the front and rear surfaces must be finely ground to meet the requirements; the radius of the cutting edge is 0.2-0.5μm
3. South African diamonds are used for the natural diamond, and the cutting edge is in the direction of the strongest diamond.
4. Diamond is firmly welded and the edge and angle are resharpened
5. Diamond size 4x2x2 colourless, transparent, free of cracks and impurities; 12-sided, South African diamond grade D10, Mohs hardness 10
6. main cutting edges (main and secondary edges) free of chips under 200x microscope
7. body material 45#, HRC 40-45 body tempered