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roller nip inspection","scene":"Two differently sized smooth feed rollers sit parallel in a print-shop maintenance fixture, viewed along their axes. Anodized end faces, shaft collars and bearing blocks establish real machinery while the exposed circular rims meet exactly once. A paper roll and maintenance gloves remain behind the fixture, leaving the nip clear. Arrange the measured circular rims at the exact source radii and centers. Their single contact point stays unobstructed, and an inspection circle marks only that point while both objects remain stationary.","domain_shift":"Industrial feed equipment makes circular contact mechanically meaningful; shafts and supports explain the geometry instead of enlarging unrelated balls to force the source radii.","mechanism":"Use rigid, smooth circular rim meshes with exact center separation equal to summed radii. Add shallow supporting fixtures outside the measured contact and a calibrated answer overlay.","fidelity_note":"Contact is between ideal rigid circular rims in the measurement plane. 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