In the body‑in‑white assembly line, the indexing turntable that rotates chassis sections from one welding station to the next is driven by a pneumatic double‑acting rotary actuator. The actuator provides the torque needed to turn the table precisely to the programmed angle and holds the position until the next command, allowing each weld cell to receive the workpiece in exact alignment. By integrating limit stops directly on the drive, the system automatically detects the start and end of each rotation, eliminating the need for separate sensors and reducing cycle time. This reliable positioning is also used on door‑hinge assembly stations, where the actuator swings the door frame into the correct opening angle for bolt insertion. Because the drive is powered by compressed air already present on most automotive plants, it fits seamlessly into existing utility networks and can be controlled by the line’s PLC without additional electrical wiring. The result is a compact, maintenance‑light solution that keeps the production flow continuous while delivering repeatable motion for critical fit‑up operations.