Abstract

The Precessions™ process polishes complex surfaces from the ground state preserving the ground-in form, and subsequently rectifies measured form errors. Our first paper introduced the technology and focused on the novel tooling. In this paper we describe the unique CNC machine tools and how they operate in polishing and correcting form. Experimental results demonstrate both the ‘2D’ and ‘2½D’ form-correction modes, as applied to aspheres with rotationally-symmetric target-form.

© 2006 Optical Society of America

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References

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  1. D. D. Walker, D. Brooks, A. King, R. Freeman, R. Morton, G. McCavana, and S.-W. Kim, "The ‘Precessions’ tooling for polishing and figuring flat, spherical and aspheric surfaces," Opt. Express 11, 958-964 (2003).
    [CrossRef] [PubMed]
  2. H. M. Martin, D. S. Andersen, J. R. P. Angel, R. H. Nagel, S. C. West, and R. S. Young, "Progress in the stressed-lap polishing of a 1.8m f/1 mirror," in Advanced Technology Optical Telescopes IV, L.D. Barr, ed., Proc. SPIE 1236, 682-690 (1990).
    [CrossRef]
  3. T. Korhonen and T. Lappalainen "Computer controlled figuring and testing," in Advanced Technology Optical Telescopes IV, L. Barr, ed., Proc. SPIE 1236, 691-695 (1990).
    [CrossRef]
  4. R. A. Jones "Fabrication of a large, thin, off-axis aspheric mirror," Opt. Eng. 33,4067-4075 (1994).
    [CrossRef]
  5. V. W. Kordonski, D. Golini, P. Dumas, S. J. Hogan, and S. D. Jacobs, "Magnetorheological-suspension-based finishing technology," in Smart Structures and Materials 1998: Industrial and Commercial Applications of Smart Structures Technologies, J. M. Sater, ed., Proc. SPIE 3326, 527-535 (1998).
    [CrossRef]
  6. O. W. Fähnle, H. van Brug, and H. Frankena, "Fluid jet polishing of optical surfaces," Appl. Opt. 37, 6771-6773 (1998).
    [CrossRef]
  7. D. D. Walker, R. Freeman, G. McCavana, R. Morton, D. Riley, J. Simms, D. Brooks, and A. King, "The first aspheric form and texture results from a production machine embodying the precession process," in Optical Manufacturing and Testing IV, H. P. Stahl, ed., Proc. SPIE 4451, 267-276 (2001).
    [CrossRef]

2003

1998

1994

R. A. Jones "Fabrication of a large, thin, off-axis aspheric mirror," Opt. Eng. 33,4067-4075 (1994).
[CrossRef]

Brooks, D.

Fähnle, O. W.

Frankena, H.

Freeman, R.

Jones, R. A.

R. A. Jones "Fabrication of a large, thin, off-axis aspheric mirror," Opt. Eng. 33,4067-4075 (1994).
[CrossRef]

Kim, S.-W.

King, A.

McCavana, G.

Morton, R.

van Brug, H.

Walker, D. D.

Appl. Opt.

Opt. Eng.

R. A. Jones "Fabrication of a large, thin, off-axis aspheric mirror," Opt. Eng. 33,4067-4075 (1994).
[CrossRef]

Opt. Express

Other

V. W. Kordonski, D. Golini, P. Dumas, S. J. Hogan, and S. D. Jacobs, "Magnetorheological-suspension-based finishing technology," in Smart Structures and Materials 1998: Industrial and Commercial Applications of Smart Structures Technologies, J. M. Sater, ed., Proc. SPIE 3326, 527-535 (1998).
[CrossRef]

D. D. Walker, R. Freeman, G. McCavana, R. Morton, D. Riley, J. Simms, D. Brooks, and A. King, "The first aspheric form and texture results from a production machine embodying the precession process," in Optical Manufacturing and Testing IV, H. P. Stahl, ed., Proc. SPIE 4451, 267-276 (2001).
[CrossRef]

H. M. Martin, D. S. Andersen, J. R. P. Angel, R. H. Nagel, S. C. West, and R. S. Young, "Progress in the stressed-lap polishing of a 1.8m f/1 mirror," in Advanced Technology Optical Telescopes IV, L.D. Barr, ed., Proc. SPIE 1236, 682-690 (1990).
[CrossRef]

T. Korhonen and T. Lappalainen "Computer controlled figuring and testing," in Advanced Technology Optical Telescopes IV, L. Barr, ed., Proc. SPIE 1236, 691-695 (1990).
[CrossRef]

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Figures (12)

Fig. 1.
Fig. 1.

The IRP200 CNC polishing machine

Fig. 2.
Fig. 2.

Close-up of the IRP200 virtual pivot and H axis (left), and the work-piece on the C axis (right)

Fig. 3.
Fig. 3.

Precessed polishing bonnet, showing the precession angle about the local normal to the part.

Fig. 4.
Fig. 4.

Close-up of precessed tool on the 200mm machine

Fig. 5.
Fig. 5.

PGI 1240 Form Talysurf ™ profilometry of the part, directly off the grinder

Fig. 6.
Fig. 6.

Form measured after ~ 100 mins pre-polish on IRP200 ™

Fig. 7.
Fig. 7.

Form after first correction run of 90 mins

Fig. 8.
Fig. 8.

Form after second correction run of 45 mins

Fig. 9.
Fig. 9.

Data as per Fig. 10, but plotted to design radius of 44.398 mm

Fig. 10.
Fig. 10.

Form after third correction run of 18 mins with base radius adjusted to 44.401 mm

Fig. 11.
Fig. 11.

Surface form measurement before 2½D processing (~1λ p-to-v excluding edge)

Fig. 12.
Fig. 12.

Surface form after 8 runs and 3 hours of 2½D processing (0.12λ p-to-v)

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