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San Jose State University Department of Mechanical Engineering

San Jose State University Department of Mechanical Engineering. Large Optics Diamond Turning Machine Presented by Vu Dao Gilbert Wong. Agenda. Introduction Advantages Precision Design Summary Q&A. Introduction. LODTM Large Optics Diamond Turning Machine

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San Jose State University Department of Mechanical Engineering

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  1. San Jose State University Department of Mechanical Engineering Large Optics Diamond Turning Machine Presented by Vu Dao Gilbert Wong ME 250 Precision Machine Design

  2. Agenda • Introduction • Advantages • Precision • Design • Summary • Q&A ME 250 Precision Machine Design

  3. Introduction • LODTM • Large Optics Diamond Turning Machine • High precision two axis vertical lathe • Diamond cutting tool • 64 in diameter, 20 in height, 3000lb • Most precise vertical axis lathe currently available. ME 250 Precision Machine Design

  4. ME 250 Precision Machine Design

  5. Advantages of LODTM • Produce complex geometries • Achieve high accuracy and repeatability • Produce mirror finish surface ME 250 Precision Machine Design

  6. Precision • Radial • 28 nm (280Å) • Surface finish • 4.3 nm (42Å) • Analogy 280Å is ~ 3500 times smaller than diameter of human hair ME 250 Precision Machine Design

  7. Metrology System • Metrology frame • Kinematically mounted to LODTM frame by three blade flexures • Super Invar • Very low CTE, 0.63*10-6/°C • Liquid Cooling • Double-walled panels surrounding the metrology frame • Uniform temperature of 0.001°F ME 250 Precision Machine Design

  8. Motion Control • Interferometer • Resolution .618nm • Closed loop • Relative measurement Baird, 1999 ME 250 Precision Machine Design

  9. Motion Control Baird, 1999 ME 250 Precision Machine Design

  10. Motion Control • Bearings • Fluid-film for smooth friction free motion • Radial, Thrust • Water cooled to prevent heat generation • Analog Servos • One for X and Z axis • 25.4 mm/sec machining speed • Fast Tool Servo ME 250 Precision Machine Design

  11. Cutting Motion Donaldson, 1983 ME 250 Precision Machine Design

  12. Environmental Control • Four pneumatic isolators • Acoustic vibration isolation • Air Flow (External) • Uniform temperature of 0.01°F Patterson, 1987 ME 250 Precision Machine Design

  13. Summary • Highest accuracy turning machine • Strict temperature control • Primarily used to produce precision lens ME 250 Precision Machine Design

  14. References • Baird, E.D., Patterson, S.R, Donaldson, R.R., “The Laser Interferometer System for the Large Optics Diamond Turning Machine,” UCRL-ID-134693, Lawrence Livermore National Laboratory, 1999. • Donaldson, R.R., Patterson, S., “Design and Construction of A Large Vertical Axis Diamond Turning Machine,” UCRL-89738, Lawrence Livermore National Laboratory, 1983. • McCue, H., “The Motion Control System for the Large Optics Diamond Turning Machine,” UCRL-86438, Lawrence Livermore National Laboratory, 1981. • Patterson, S., “Inspection of the Large Optics Diamond Turning Machine,” UCRL-97696, Lawrence Livermore National Laboratory, 1987. • Hamilton, Jim., “Large Optics Diamond Turning Machine,” UCRL-TB-147593, Lawrence Livermore National Laboratory, 2002. ME 250 Precision Machine Design

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