Will the 1X vibration return to normal levels if an eccentric sheave is balanced?

When considering whether the 1X vibration will return to normal levels after balancing an eccentric sheave, it’s important to understand the role of rotor dynamics and how imbalance affects vibration levels. An eccentric sheave can lead to an uneven distribution of mass, which creates centrifugal forces that contribute to increased vibration at the 1X frequency, typically associated with the rotation speed of the machinery.

When the eccentric sheave is balanced, it minimizes the uneven forces acting upon the machinery. This balancing process corrects the mass distribution, which reduces the imbalances that cause excess vibration. However, it’s crucial to note that balancing the sheave will primarily address those specific imbalance-induced vibrations. If there are other underlying issues, such as misalignment, damage to bearings, or other sources of mechanical defect, the 1X vibration may not completely return to normal levels. Therefore, balancing alone may not be sufficient to eliminate all sources of vibration, which explains why the answer indicates that the vibration will not necessarily return to normal.