Low Cost Very Large Diamond Turned Metal Mirror

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX10CB49C
Agency Tracking Number: 084074
Amount: $596,534.00
Phase: Phase II
Program: SBIR
Awards Year: 2010
Solicitation Year: 2008
Solicitation Topic Code: S2.04
Solicitation Number: N/A
Small Business Information
Dallas Optical Systems, Inc.
1790 Connie Lane, Rockwall, TX, 75032-6708
DUNS: 868448655
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 John Casstevens
 Principal Investigator
 (972) 564-1156
 c0029156@netportusa.com
Business Contact
 John Casstevens
Title: President
Phone: (972) 564-1156
Email: c0029156@netportusa.com
Research Institution
N/A
Abstract
Electrolytic plating of high phosphorus nickel phosphorus alloy will encapsulate a machined mirror substrate master made of fine cell plastic foam such as polystyrene that has been sealed and made electrically conductive with painted-on coatings. After encapsulation with up to one millimeter of NiP metal holes will be drilled and the plastic master will be dissolved with a solvent such as acetone and removed. Prior to encapsulation plating round or other cross section tubes are inserted thru holes in the plastic foam so that they are incorporated into the electroformed mirror structure when the master is encapsulated with more NiP. The tubes which connect the front and back surfaces of the mirror are made by electroforming with the same NiP alloy. The finished mirror substrate will be diamond turned and the very low cutting force diamond turning process will allow fabrication of a very thin mirror face plate without print through since there is only a very low pressure on the mirror from diamond turning. Machining of plastic foam is accomplished very quickly and the foam material is very low cost. In a production mode the expendable foam plastic masters could themselves be molded. The size of the mirrors is only limited by the capacities of the plating bath and the diamond turning machine. The process is applicable to any optical contour and to the manufacture of off-axis segments.

* information listed above is at the time of submission.

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