We Balanced a Fan on Our Balancing Machine, but Detected a Heavy Spot on the Fan Using a Static Balancing Fixture. What’s the Issue?

In this case, the dynamic balancing machine compensates for both static and dynamic imbalances in the fan, whereas the static balancing fixture only detects static imbalance. A fan balanced on a dynamic balancing machine may show a heavy spot when tested on a static balancing fixture, due to the inability of static fixtures to measure dynamic imbalances. During operation, the fan is balanced and does not cause performance issues.