How is coupling runout detected?

Coupling runout is detected by placing a dial indicator on the rim and checking the readings. This method involves measuring the variation in the distance from the center of the coupling to its outer edge as it rotates, which can reveal any misalignment or imbalance. The dial indicator provides precise measurements, allowing the technician to see how much the coupling deviates from a true circular motion.

Using a straight edge, as mentioned in other methods, may not provide the accuracy needed to determine runout since it primarily checks for flatness or alignment rather than the rotational dynamics of the coupling. Similarly, using a level focuses on ensuring that surfaces are horizontal or vertical, not on the specifics of rotational alignment. Measuring the distance across the coupling might give a general idea of size but wouldn't indicate how well the coupling is aligned or if there are issues with runout. Thus, the dial indicator method is the most effective for accurately detecting coupling runout.