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Ultra-precision cutting Ultra-precision cutting refers to the cutting method whose surface roughness is less than Ra0.04μm. The key problem in ultra-precision machining is that the thin surface layer of 0.1μm is cut in the final step. This requires both an extremely sharp tool with a radius of the blunt circle of the tool at the nanoscale and a tool with enough durability to keep it sharp. At present, only diamond tools can meet the requirements. In ultra-precision cutting, the cutting speed should be very high and the cutting amount should be small to ensure that the residual area on the workpiece surface is small, so as to obtain minimal surface roughness
