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Design of 2.5m Optical Fabrication Machine for Astronomical Mirrors
Yi Zheng; Ying Li; Da-xing Wang; Bin Liang
Source PublicationAdvanced Optical and Mechanical Technologies in Telescopes and Instrumentation
PagesVol.7018 32-1-8
Conference Date2008-6-23
Conference PlaceMarseille, France
Funding OrganizationThe International Society for Optical Engineering
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.
KeywordOptical Fabrication Machine Aspherical Mirror Computer Control Sub-aperture Tool Active Stressed Lap
Subject Area天文镜面(材料、加工、检测)
Document Type会议论文
Recommended Citation
GB/T 7714
Yi Zheng,Ying Li,Da-xing Wang,et al. Design of 2.5m Optical Fabrication Machine for Astronomical Mirrors[C]:SPIE,2008:Vol.7018 32-1-8.
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