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Design Considerations of Polishing Lap for Computer-Controlled Cylindrical Polishing ProcessThe future X-ray observatory missions, such as International X-ray Observatory, require grazing incidence replicated optics of extremely large collecting area (3 m2) in combination with angular resolution of less than 5 arcsec half-power diameter. The resolution of a mirror shell depends ultimately on the quality of the cylindrical mandrels from which they are being replicated. Mid-spatial-frequency axial figure error is a dominant contributor in the error budget of the mandrel. This paper presents our efforts to develop a deterministic cylindrical polishing process in order to keep the mid-spatial-frequency axial figure errors to a minimum. Simulation studies have been performed to optimize the operational parameters as well as the polishing lap configuration. Furthermore, depending upon the surface error profile, a model for localized polishing based on dwell time approach is developed. Using the inputs from the mathematical model, a mandrel, having conical approximated Wolter-1 geometry, has been polished on a newly developed computer-controlled cylindrical polishing machine. We report our first experimental results and discuss plans for further improvements in the polishing process.
Document ID
20100023064
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Khan, Gufran S. (Oak Ridge Associated Universities, Inc. Huntsville, AL, United States)
Gubarev, Mikhail (NASA Marshall Space Flight Center Huntsville, AL, United States)
Speegle, Chet
Ramsey, Brian (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 24, 2013
Publication Date
May 25, 2010
Subject Category
Computer Systems
Report/Patent Number
M10-0874
M10-0369
M10-0716
Meeting Information
Meeting: DGaO 2010
Location: Wetzlar
Country: Germany
Start Date: May 25, 2010
End Date: May 29, 2010
Distribution Limits
Public
Copyright
Public Use Permitted.

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