Accession Number : ADD013216

Title :   Machining Process for Metal Mirror Surfaces.

Descriptive Note : Patent, Filed 18 Sep 81, patented 3 Jan 84,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Decker, Donald L ; Porteus, James O ; Grandjean, Darrell J

Report Date : 03 Jan 1984

Pagination or Media Count : 4

Abstract : A method of producing uniform metal mirror surfaces which are harder than the starting material. A three step machining process produces uniform metal mirror surfaces without polishing defects or lack of spatial uniformity from previous polishing methods. The surface is first machined in the normal manner for diamond turning. The second machining process requires the rake angle to be made negative to the extent of approximately 30. This machining process creates plastic deformation in the surface material. The final step requires machining material in the top rake angle of from -5 to +5 which provides the uniform surface of regular diamond machining. An alternate method only needs a single cut at an intermediate rake angle.

Descriptors :   *PATENTS, *MIRRORS, *METALS, *MACHINING, REFLECTANCE, SURFACE FINISHING, LASER MATERIALS, HARDENING, SURFACES, COLD WORKING, COPPER, GOLD, SILVER, ALUMINUM, ALLOYS, CRACKS, VOIDS, ANGLES

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE