The maximum size is limited by the height of the tower, because larger shot sizes must fall farther to solidify. To make larger shot sizes, a copper sieve with larger holes is used. A slightly inclined table is used for checking roundness. The now fully cooled balls are checked for roundness and sorted by size those that are "out of round" are remelted. The partially cooled balls are caught at the floor of the tower in a water-filled basin. The liquid lead forms tiny spherical balls by surface tension, and solidifies as it falls. In a shot tower, lead is heated until molten, then dropped through a copper sieve high in the tower. The shot is primarily used for projectiles in shotguns, and for ballast, radiation shielding, and other applications for which small lead balls are useful. How a shot tower works The Dubuque, Iowa shot towerĪ shot tower is a tower designed for the production of small-diameter shot balls by free fall of molten lead, which is then caught in a water basin. Tower used for the production of lead balls
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