Automated optical fabrication

First results from the new "Precessions" 1.2m CNC polishing machine

D. D. Walker, A. T.H. Beaucamp, V. Doubrovski, C. Dunn, R. Evans, R. Freeman, J. Kelchner, G. McCavana, R. Morton, D. Riley, J. Simms, G. Yu, X. Wei

Research output: Chapter in Book/Report/Conference proceedingConference contribution

20 Citations (Scopus)

Abstract

The requirements of space and defence optical systems and ground-based astronomy (especially extremely large telescopes) are providing optical fabricators with new challenges. These challenges particularly concern process speed, determinism and automation, and tighter tolerances on surface form and texture. Moreover, there is a growing demand for complex off-axis and 'freeform' surfaces and for larger components of the ~lm scale. With this in view, we first report on form-correction on a smaller analogue of the LRP1200 - an IRP400 in service in industry. We then report on the design, commissioning and preliminary process-development results from the first of the scaled-up 1.2m capacity CNC polishing machine from Zeeko, Ltd. This machine delivers the 'Classic' bonnet-based process, together with two new processes - fluid-jet polishing and the hybrid soft-grinding/polishing process called 'Zeeko-Grolish.' We indicate how this trio of processes running on the same machine platform with unified software can provide an unprecedented dynamic range in both volumetric removal rate and removal spot-size. This leads into a discussion of how these processes may be brought to bear on optimal control of texture and form. Preliminary performance of the 1.2m machine is illustrated with results on both axially-symmetric and more complex removal regimes. The paper concludes with an overview of the relevance of the technology to efficient production of instrumentation-optics, space optics and segmented telescope mirrors.

Original languageEnglish
Title of host publicationOptomechanical Technologies for Astronomy
Subtitle of host publicationSPIE Astronomical Telescopes and Instrumentation 2006
EditorsEli Atad-Ettedgui, Joseph Antebi, Dietrich Lemke
PublisherSPIE
Number of pages8
Volume6273
ISBN (Print)9780819463388
DOIs
Publication statusPublished - 27 Jul 2006
Externally publishedYes
EventOptomechanical Technologies for Astronomy - Orlando, United States
Duration: 24 May 200631 May 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6273
ISSN (Print)0277-786X

Conference

ConferenceOptomechanical Technologies for Astronomy
CountryUnited States
CityOrlando
Period24/05/0631/05/06

Fingerprint

Optical Fabrication
Polishing machines
Polishing
precession
polishing
Fabrication
Telescopes
fabrication
textures
Textures
telescopes
optics
fluid jets
Space optics
Antenna grounds
Astronomy
optimal control
grinding
automation
bears

Cite this

Walker, D. D., Beaucamp, A. T. H., Doubrovski, V., Dunn, C., Evans, R., Freeman, R., ... Wei, X. (2006). Automated optical fabrication: First results from the new "Precessions" 1.2m CNC polishing machine. In E. Atad-Ettedgui, J. Antebi, & D. Lemke (Eds.), Optomechanical Technologies for Astronomy: SPIE Astronomical Telescopes and Instrumentation 2006 (Vol. 6273 ). [627309] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6273 ). SPIE. https://doi.org/10.1117/12.671098
Walker, D. D. ; Beaucamp, A. T.H. ; Doubrovski, V. ; Dunn, C. ; Evans, R. ; Freeman, R. ; Kelchner, J. ; McCavana, G. ; Morton, R. ; Riley, D. ; Simms, J. ; Yu, G. ; Wei, X. / Automated optical fabrication : First results from the new "Precessions" 1.2m CNC polishing machine. Optomechanical Technologies for Astronomy: SPIE Astronomical Telescopes and Instrumentation 2006. editor / Eli Atad-Ettedgui ; Joseph Antebi ; Dietrich Lemke. Vol. 6273 SPIE, 2006. (Proceedings of SPIE - The International Society for Optical Engineering).
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Walker, DD, Beaucamp, ATH, Doubrovski, V, Dunn, C, Evans, R, Freeman, R, Kelchner, J, McCavana, G, Morton, R, Riley, D, Simms, J, Yu, G & Wei, X 2006, Automated optical fabrication: First results from the new "Precessions" 1.2m CNC polishing machine. in E Atad-Ettedgui, J Antebi & D Lemke (eds), Optomechanical Technologies for Astronomy: SPIE Astronomical Telescopes and Instrumentation 2006. vol. 6273 , 627309, Proceedings of SPIE - The International Society for Optical Engineering, vol. 6273 , SPIE, Optomechanical Technologies for Astronomy, Orlando, United States, 24/05/06. https://doi.org/10.1117/12.671098

Automated optical fabrication : First results from the new "Precessions" 1.2m CNC polishing machine. / Walker, D. D.; Beaucamp, A. T.H.; Doubrovski, V.; Dunn, C.; Evans, R.; Freeman, R.; Kelchner, J.; McCavana, G.; Morton, R.; Riley, D.; Simms, J.; Yu, G.; Wei, X.

Optomechanical Technologies for Astronomy: SPIE Astronomical Telescopes and Instrumentation 2006. ed. / Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke. Vol. 6273 SPIE, 2006. 627309 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6273 ).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Evans, R.

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AU - Kelchner, J.

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Walker DD, Beaucamp ATH, Doubrovski V, Dunn C, Evans R, Freeman R et al. Automated optical fabrication: First results from the new "Precessions" 1.2m CNC polishing machine. In Atad-Ettedgui E, Antebi J, Lemke D, editors, Optomechanical Technologies for Astronomy: SPIE Astronomical Telescopes and Instrumentation 2006. Vol. 6273 . SPIE. 2006. 627309. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.671098