Method and apparatus for producing a radially and circularly con

Details Method and apparatus for producing a radially and circularly con Method and apparatus for producing a radially and circularly con

1994-08-29

1995-12-26

Briggs, William

Metal working

Method of mechanical manufacture

Assembling or joining

359851, 409132, 409162, 451 41, B23P 1302, B23C 316

Patent

active

054776023

ABSTRACT:
A method and apparatus are provided for the production of panels for a large segmented parabolic telescope reflector, using a simple adaptation of a technique common to a lathe. The reflective surface of each panel is contoured both radially and circularly by oscillating a platen supporting the panel about a fixed axis relative to a tool which is fixed during platen oscillation. The tool is repositionable between oscillations along an x axis to achieve the radial contour and along a z axis to achieve the desired parabolic or spherical contour. Contrary to the normal contouring of such a surface with a 5-axis CNC machine, tool positioning along either axis is independent of tool location along the other axis, simplifying the machine structure as well as its computerized operation. A unique hinge is provided to restrain the platen in a radial direction while allowing floating action of the platen on an air cushion during its oscillation.

REFERENCES:
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patent: 4629378 (1986-12-01), Parsons
patent: 4802309 (1989-02-01), Heynacher
patent: 4840095 (1989-06-01), Nussbaumer et al.
patent: 5351376 (1994-10-01), Kitamura

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