1. The Mechanical Design of the Second and third Antarctic Survey Telescope Wen Haikun

2. http://www.niaot.ac.cn Outline 1. The Tube Design 2. The Drive System Design 3. The Low temperature test 4.The AST3-3 Mechanical Design

3. http://www.niaot.ac.cn Sealing Structure Temperature compensation Structure Titanium alloy The Tube Structure Design

4. http://www.niaot.ac.cn Bending angle Corrector mirror:2.84″ Primary Mirror:2.12″

5. http://www.niaot.ac.cn Primary Mirror Supporting Structure 9 point whiffle tree structure Fixed position in the middle hole. Flexure supporting structure

6. http://www.niaot.ac.cn The stress and the deformation of the Mirror shape The max stress value :0.425Mpa The defromation of the mirror surface shape: PV Value :43.7nm ， RMS Value:7.2nm 。

7. http://www.niaot.ac.cn The focal plane System Switch the filter Auto-focus system Thermal dissipation

8. http://www.niaot.ac.cn Deformation of the drive system Deformation in the east-west direction Max displacement: 0.935e-04mm Deformation in the north-south direction Max displacement :0.884-04mm

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10. Buffer and limit position structure

11. http://www.niaot.ac.cn Reducer improvement Increase the rigidity of the reducer The lowest frequency :14.8Hz

12. http://www.niaot.ac.cn The Low temperature Test

13. http://www.niaot.ac.cn Mo He winter test

14. http://www.niaot.ac.cn Picture in the Anatarctic

15. http://www.niaot.ac.cn The tube of the third telescope Move the CCD to the outside of the tube Solve the heat problem easy to install and maintain

16. http://www.niaot.ac.cn The drive system of the third telescope Adjust the gaps of the gear Increase the rigidity of the reducer

17. http://www.niaot.ac.cn Thankyou