On a CNC milling center, the moment the tool‑change arm swings into position, a Rexroth pneumatic cylinder extends to lock the new insert against the spindle. The cylinder’s rapid stroke provides the precise holding force required to keep the cutting tool aligned while the machine’s controller initiates the next machining pass. Because the motion is purely pneumatic, the actuator can be cycled thousands of times a day without heating, keeping the tool‑change time to a few hundred milliseconds. In addition to tool changes, the same type of cylinder is often used to open and close workpiece clamps on high‑speed machining stations, delivering the repeatable pressure needed for rigid positioning during heavy milling or drilling operations. A secondary example can be found in tire‑manufacturing plants, where the cylinder drives the clamping plates of a curing press, ensuring the mould stays closed throughout the vulcanisation cycle. In both cases the pneumatic cylinder turns a brief mechanical action into a reliable, automated step that keeps production flowing.