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Proceedings Paper

Simulation Of Free-Abrasive Grinding Of Grazing-Incidence Mirrors With Vertical-Honing And Flexible Blades
Author(s): Frederic D. Powell
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Paper Abstract

Vertical honing is in use at Itek for free-abrasive grinding of grazing-incidence mirrors for the Advanced X-Ray Astronomical Observatory (AXAF) Technology Mirror Assembly (TMA) program as a demonstration for the High-Resolution Mirror Assembly (HRMA) flight hardware. Software has been developed to enable exploring, by numerical simulation, the consequences of various options of this fabrication technique. The tolerances allowed for these mirrors are such that the flexibilities of the workpiece, of the vertical-honing blades, and of the mechanism that supports the blades and the work-piece must be taken into account, as well as the hydrodynamic properties of the slurry and the relative wear of the blades and the workpiece. Two policies of formation of the blades are considered: (1) an initially flat profile with face width proportional to the desired figure, or (2) a curved profile proportional to the desired figure with straight-edged face. It is shown that both policies can form the desired figure, but that the latter has more attractive properties as the end of grinding approaches. Using the latter policy, it is demonstrated by simulation that it is possible to preform vertical-honing blades to take into account the system flexibility and the effects of wear (both of the blades and the workpiece) so that grinding in principle ends with a workpiece ready for polishing. The principles of the software model will be outlined. Some of the results to date and grinding control policies that become possible will be discussed.

Paper Details

Date Published: 21 October 1986
PDF: 6 pages
Proc. SPIE 0640, Grazing Incidence Optics, (21 October 1986); doi: 10.1117/12.964359
Show Author Affiliations
Frederic D. Powell, Itek Optical Systems (United States)

Published in SPIE Proceedings Vol. 0640:
Grazing Incidence Optics
John F. Osantowski; Leon P. Van Speybroeck, Editor(s)

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