Abstract: The speed of a driverless vehicle is controlled along the length of the module from an incoming high speed to an outgoing low speed or vice versa. The module includes first, second and third aligned drive tubes between tracks adapted to support a vehicle. A first motor is coupled to the first drive tube for driving the same at a first (high) speed. The second drive motor is coupled to the third drive tube for driving the same at a second (low) speed. The second drive tube is maintained out of mechanical engagement with the first and third drive tubes. A variable speed motor is coupled to the second drive tube to drive the second tube between the first (high) and second (low) speeds, independently of the first and second motors.

Abstract: Ingot yield is improved by changing teeming practice to pouring ingot body and hot top by weight rather than by volume to a mark on a hot top casting. Correct weight addition to the ingot hot top is calculated by a computerized weight-loss weigher system using either a value related to ingot mold body size or a precentage of body weight. Calculation is initiated either manually or automatically when hot metal level is detected at the bottom of the hot top casting.