Design of 2.5m optical fabrication machine for astronomical mirrors

Yi Zheng; Ying Li; Da-xing Wang; Bin Liang

doi:10.1117/12.785318

18 July 2008 Design of 2.5m optical fabrication machine for astronomical mirrors

Yi Zheng, Ying Li, Da-xing Wang, Bin Liang

Proceedings Volume 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation; 701832 (2008) https://doi.org/10.1117/12.785318
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

Mirrors with large aperture, high asphericity and tight shape tolerances are indispensable for modern astronomical telescope. This pressing demand provides new challenges on optical fabrication. Paper here presents a 2.5m CNC machine which has been designed and constructed in Nanjing Institute of Astronomical Optics & Technology (NIAOT). Mechanical layout of 2.5m OFM is first studied basing on analyzing fabrication requirements. Equipped with six motion axes, it can process parts up to 2500mm in diameter. Rotary symmetrical component can be finished under cylindrical coordinates and Cartesian coordinates are applied for off-axis workpiece. Then control system using CAN field bus is discussed. This control architecture offers many characteristics, such as high openness, expansibility and flexibility. Since 2.5m OFM is developed to combine faculties of grinding, lapping and polishing, we arrange a series of tests for each function. Now a 1.1m hexagonal mirror is carried for grinding. Polishing test using sub-aperture tool and active stressed lap will be programmed later.

Citation Download Citation

Yi Zheng, Ying Li, Da-xing Wang, and Bin Liang "Design of 2.5m optical fabrication machine for astronomical mirrors", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701832 (18 July 2008); https://doi.org/10.1117/12.785318

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