To a repeatability measured in single-figure microns, the optical measuring equipment automatically determines the length of a free- form loop of coiled spring to determine what its circumference will be when it is circular, after which dividing by pi produces a precise result for the diameter. Clifford Springs now plans to use the iNEXIV VMA-4540 to count automatically the number of coils per unit length of spring, looped or unwelded, which

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