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Proceedings Paper

Design of 2.5m optical fabrication machine for astronomical mirrors
Author(s): Yi Zheng; Ying Li; Da-xing Wang; Bin Liang
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Paper 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.

Paper Details

Date Published: 18 July 2008
PDF: 8 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701832 (18 July 2008); doi: 10.1117/12.785318
Show Author Affiliations
Yi Zheng, Nanjing Institute of Astronomical Optics & Technology (China)
Graduate School of the Chinese Academy of Sciences (China)
Ying Li, Nanjing Institute of Astronomical Optics & Technology (China)
Da-xing Wang, Nanjing Institute of Astronomical Optics & Technology (China)
Bin Liang, Nanjing Institute of Astronomical Optics & Technology (China)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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