Most now use high-precision free-form surface polishing process as the final process step. Currently there are a variety of foreign online measurement with multi-axis CNC machine tools polishing system. Japanese companies such as Canon optical lens surfaces for final polishing precision surface polishing machine, it has a numerical coordinate system, using the on-line measurement. When machining surfaces, according to the lens surface error measured, controlled polishing head of the polishing time and pressure, so that the surface polishing process to achieve a semi-automatic.

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