The

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The  Mechanical Design of the Second and third
Antarctic Survey Telescope

• Wen Haikun

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Outline

• 1. The Tube Design
• 2. The Drive System Design
• 3. The Low temperature test
• 4.The AST3-3 Mechanical Design

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The Tube Structure Design

• Sealing Structure
• Temperature compensation Structure
• Titanium alloy

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Bending angle

• Corrector mirror2.84?
• Primary Mirror2.12?

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Primary Mirror Supporting Structure

• 9 point whiffle tree structure
• Fixed position in the middle hole.
• Flexure supporting structure

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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 Value7.2nm?

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The focal plane System

• Switch the filter
• Auto-focus system
• Thermal dissipation

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Deformation of the drive system
Deformation in the north-south direction Max
displacement 0.884-04mm

• Deformation in the
• east-west direction
• Max displacement
• 0.935e-04mm

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Buffer and limit position structure
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Reducer improvement

• Increase the rigidity of the reducer
• The lowest frequency 14.8Hz

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The Low temperature Test
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Mo He winter test
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Picture in the Anatarctic
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The tube of the third telescope

• Move the CCD to the outside of the tube
• Solve the heat problem
•  easy to install and maintain

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The drive system of the third telescope

• Adjust the gaps of the gear
• Increase the rigidity of the reducer

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• Thankyou