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The production task for very large metal mirrors by micromachining has been addressed by various manufacturors on this SPIE forum. We as a machine tool builder have since years focussed on providing air-bearing turn-tables of diameters from lm up to 5m diameter. With less than 1μm departure from planarity and roundness these - tables are used not only for metrology but for machining of such large mirrors specifically.
H. Geppert
"About Very Large Air-Bearing Tables (3M O.D.) For Micromachining Of Aspherical And Fresnel Mirrors.", Proc. SPIE 0645, Optical Manufacturing, Testing and Aspheric Optics, (3 November 1986); https://doi.org/10.1117/12.964481
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H. Geppert, "About Very Large Air-Bearing Tables (3M O.D.) For Micromachining Of Aspherical And Fresnel Mirrors.," Proc. SPIE 0645, Optical Manufacturing, Testing and Aspheric Optics, (3 November 1986); https://doi.org/10.1117/12.964481