DIDION | Rotary Sand / Casting Separators - DIDION InternationalThe cleaned castings travel to the casting discharge end of the drum, where they exit and move to the next stage of processing in the cleaning room. The tumbling action in the DIDION crushes sand lumps, removes core butts, and empties sand pockets. The apertures in the patented lining act as a rotary screen to prevent.rotary screen sand casting separator,DIDION Sand Casting Equipment and Foundry EquipmentThese machines crush, scrub, screen, and classify large mold lumps to reusable grain size sand. sanding screen · Rotary Sand Screens DIDION Rotary Sand Screens blend . DIDION Rotary Carbon Separator / Thimble Cleaners utilize a highly efficient tumbling action for thorough cleaning of carbon from cast iron thimbles.