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5 August 1998 Fast fabrication of high-gradient optical aspheric surface by CNC machine
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For fabricating a high gradient aspherics, we have designed a ZDCCOS complex, which consist of a CNC Polisher and a CQG- II digital wavefront interferometer. The Polisher has 5 degrees of freedom. The computer makes a small tool to move in three dimensions and drive the workpiece to sway, and turn around simultaneously to keep the pad in the normal directions of the workpiece surface. We designed a special dual-rotation tool and presented a new model to calculate the removal function of which. the model was verified by the experiments. The track programming algorithm was also designed to make the tools to move on spatial concentric circles, during the fabrication processes. The work piece was a (Phi) 300 mm, F5.9 focus lens, the aspheric degree of which was up to 46 micrometers . But only after 8 hours 43 minutes continuous fine grinding, and about 15 hours polishing, the surface error was decreased to 1(lambda) (Rms, (lambda) equals 0.6328 micrometers ).
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Weimin Zheng, Tianning Cao, Yanzhou Xu, and Min Qian "Fast fabrication of high-gradient optical aspheric surface by CNC machine", Proc. SPIE 3557, Current Developments in Optical Elements and Manufacturing, (5 August 1998);

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