16 October 2002 Novel CNC polishing process for control of form and texture on aspheric surfaces
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We first consider the potential impact of a technology that could deliver polished, accurate aspheric surfaces in a routine and automated manner. We then summarise the technical challenge, and present an appraisal of the performance of the novel 'Precessions' process, which is a major advance in this direction. We outline the design concepts behind the productionized CNC polishing machines which executes the process, and then describe the progress developing strategies to preserve form when polishing ground surfaces, and to correct form on both pre-ground and polished surfaces. Particular consideration is given to resolving the inherent difficulties of control of centres on rotationally-symmetric parts. We then report on experimental results achieved with the machines. Finally, we present our programme to extend the control-algorithms to handle fully free-form surfaces, and draw conclusions about the effectiveness and generality of the 'Precessions' technique.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David D. Walker, David D. Walker, A. T.H. Beaucamp, A. T.H. Beaucamp, David Brooks, David Brooks, Richard Freeman, Richard Freeman, Andrew King, Andrew King, Gerry McCavana, Gerry McCavana, Roger Morton, Roger Morton, David Riley, David Riley, John Simms, John Simms, } "Novel CNC polishing process for control of form and texture on aspheric surfaces", Proc. SPIE 4767, Current Developments in Lens Design and Optical Engineering III, (16 October 2002); doi: 10.1117/12.451322; https://doi.org/10.1117/12.451322

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