Movement No. 105 demonstrates the screw stamping press — a powerful machine that converts circular motion into forceful rectilinear motion for stamping, coining, or pressing operations. A large threaded screw passes through a fixed nut mounted in the press frame. At the top of the screw, a horizontal flywheel or cross-arm with weighted ends is attached. When the operator swings the flywheel, the rotational momentum is transferred to the screw, driving it rapidly downward through the fixed nut and delivering a powerful impact blow to the workpiece below. The heavy flywheel stores kinetic energy and releases it all at once upon impact, multiplying the striking force far beyond what the operator’s hands alone could produce. After the stroke, the screw is reversed and raised for the next cycle. This mechanism was widely used for metal coining, embossing, and forming operations.
105. Screw stamping-press. Rectilinear motion from circular motion.