Method of making rolls for forming radar reflective surfaces

Claim 1

A process for forming apparatus for making radiant energy reflectors from reflective thin strips comprising the steps of cutting in successive passes of a cutter having a cutting edge defined by faces diverging symmetrically from the central plane of cutter motion at an angle of 35.26438 degrees along the periphery of a first roller whose circumference is a multiple of the edge measure of a cube corner reflective surface; each of the passes of a first group being parallel to the axis of rotation of the first roller, each of the passes of a second group being at an angle of 120 degrees to the passes of the first group, and a third group of passes each of which is along a path at 120 degrees to the passes of the first and second pass groups; imposing upon a second roller of differing circumference from the first roller a reverse concave pattern of that pattern achieved on the first roller; said second roller having a circumference equal to a multiple of the edge measure of a cube corner reflective surface; mounting on parallel axes the first and second rollers such that the convex cube corner rows of one roller impinge exactly in the concave cube corner rows of the other roller; and connecting drive means between the first and second rollers such that the ratio of rotational speeds of the rollers are commensurate with the ratio of their respective circumferences.