Where should vibration measurements be taken to effectively detect misalignment?

Taking vibration measurements on both sides of the coupling bearings is essential for effectively detecting misalignment. When misalignment occurs between the motor and driven equipment, it creates an imbalance in the rotating parts, which generates additional vibration. By measuring the vibration on both sides of the coupling bearings, it's possible to identify differences in vibration patterns and amplitudes, which can indicate misalignment directly.

This approach allows for capturing the dynamic response of the coupling during operation, and it can help pinpoint the specific direction and severity of the misalignment. Proper analysis of the vibration data collected at this point is crucial, as it provides insights into the alignment condition of the equipment being monitored, aiding in diagnosis and preventing further damage.

In contrast, other measurement points like the machine casing or the base of the machine may not provide specific insights into the alignment condition since they aggregate vibrations from various sources and do not focus directly on the primary point of interest—the coupling between the two rotating components.