Development of a one-microinch (250 A) spindle for diamond turning of optics
Conference
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OSTI ID:6863129
A submicroinch spindle accuracy is a requirement in achieving the capability to machine large-diameter optics to better than a 125-nm (5-..mu..in.) contour accuracy. A 100-mm (4-in.)-radius air-bearing spindle with the capacity to carry a load of 880 N (200 lbf), centered at a distance of 305 mm (12-in.) from the spindle faceplate, has been assembled and tested. Performance of the upgraded spindle has been evaluated. A 152-mm (6-in.)-radius air-bearing spindle, capable of carrying a 2640-N (600-lbf) load centered 152 mm (6-in.) from the spindle faceplate, has been fabricated and is now being assembled. Diamond machining of journal-bearing surfaces to better than a 125-nm (5-..mu..in.) roundness error was used to achieve the desired spindle accuracy. A disc-type eddy-current motor has been designed, fabricated, and tested in efforts to improve the spindle drive system.
- Research Organization:
- Oak Ridge Y-12 Plant, TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6863129
- Report Number(s):
- Y/DA-7751; CONF-780829-7
- Country of Publication:
- United States
- Language:
- English
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