Development Of A One-Microinch (250 A) Spindle For Diamond Turning Of Optics

J. M. Casstevens

doi:10.1117/12.956831

27 October 1978 Development Of A One-Microinch (250 Å) Spindle For Diamond Turning Of Optics

J. M. Casstevens

Proceedings Volume 0159, Precision Machining of Optics; (1978) https://doi.org/10.1117/12.956831
Event: 22nd Annual Technical Symposium, 1978, San Diego, United States

Abstract

A submicroinch spindle accuracy is a requirement in achieving the capability to machine large-diameter optics to better than a 125-nm (5-μin) 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-μtin) 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.

Citation Download Citation

J. M. Casstevens "Development Of A One-Microinch (250 Å) Spindle For Diamond Turning Of Optics", Proc. SPIE 0159, Precision Machining of Optics, (27 October 1978); https://doi.org/10.1117/12.956831

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