Production. Milling machines and machine castings. Fresh from the shakeout pit, where the mold is broken up and the sand sent back for reconditioning, new castings go to the core cleanout room to have the core sand removed with air and sledge hammers, vibrating machines and powerful hydraulic jets. Notice the core arbors sticking out of the sand. They are placed in the cores for the same reason that steel reinforcing bars are put in concrete floors and pillars. Each of these castings has by now become the body of a milling machine working for victory