The gearshift mechanism employs a two-stage stacked configuration for compact spatial efficiency. It offers optional configurations: either separate lever and seat operation or an integrated horn-style handle control structure. Fully gear-driven transmission delivers low energy consumption and high torque. Gears are made of premium alloy steel with surface-hardened teeth and precision-ground tooth surfaces, ensuring low noise and exceptional wear resistance. The bed guideways undergo quenching and precision grinding with a central convex profile for enhanced wear resistance. The spindle support employs medium-series tapered roller bearings for high load-bearing rigidity; the ends feature cam-locking connections to the chuck or face plate. Separate feed rod and thread cutting rod provide a broader range of feed rates and pitch selections, while delivering enhanced thread pitch precision.
