Planetary gearboxes are used because they can transmit very high torque in a compact and lightweight design. The load is shared among multiple gears, which increases strength, efficiency, and service life. They also provide smooth operation, low backlash, and high precision, making them ideal for heavy-duty and servo-driven production machines. This is why they are widely used in extrusion, cranes, mixers, wind turbines, and CNC systems. 1. Injection Molding Machines Application: Screw