Abstract: A spin casting apparatus, method of manufacture for producing a molded article from a polyurethane material, shown as a non-pneumatic tire, where a mold that is formed in sections or halves and has an inner cavity formed to have the shape of the article to be manufactured and is separable to release that article after manufacture. The mold is secured to a support plate of the apparatus that is journaled to turn axially imparting a centrifugal force into the mold. The support plate is connected to or is arranged to be connected to a motor assembly for turning, and includes a clamping arrangement for maintaining the mold halves together on the support plate. An annular trough is formed in the mold immediately adjacent to a mold interior cavity inner circumference to receive a polyurethane material liquid passed thereto, and to, in turn, pass that liquid through a trough annular opening or ports into the mold cavity.