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Proceedings Paper

Improvement of active lap processing in grinding of 1.8m primary mirror
Author(s): Haitao Liu; Fan Wu; Zhige Zeng; Bin Fan; Yongjian Wan; Yong Zhang; Linhan Xian
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Paper Abstract

The computer controlled active lap (CCAL) is used to grind a 1.8m honeycomb primary mirror. One problem which is not totally solved by CCAL is the edge effect, also exists in many other fabricating methods. To reduce the CCAL edge effect, the pressure distribution on the contact face between lap and mirror is analyzed by finite element method (FEM). A new method is proposed to calculate the pressure curve from FEM results. A simplified model is used to approximate the pressure curve along the mirror radius when active lap covers the mirror center hole. The const-linear (C-L) model is used to describe the pressure curve when active lap overhang at the mirror out edge. The contact status between lap and mirror is also considered in this paper, and its influence is taken into the material removal rate calculation. The API's T3 laser tracker is used to measure the mirror surface shape and to check the correctness of the theoretical model. The results that we have got by now and the problems that still exist are reported in this paper.

Paper Details

Date Published: 2 September 2014
PDF: 9 pages
Proc. SPIE 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 92800Z (2 September 2014); doi: 10.1117/12.2068096
Show Author Affiliations
Haitao Liu, Institute of Optics and Electronics (China)
Univ. of Chinese Academy of Sciences (China)
Fan Wu, Institute of Optics and Electronics (China)
Zhige Zeng, Institute of Optics and Electronics (China)
Bin Fan, Institute of Optics and Electronics (China)
Yongjian Wan, Institute of Optics and Electronics (China)
Yong Zhang, Institute of Optics and Electronics (China)
Linhan Xian, Institute of Optics and Electronics (China)


Published in SPIE Proceedings Vol. 9280:
7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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