Where should shims be added to correct a soft foot condition on a motor mount?

When correcting a soft foot condition on a motor mount, the proper approach is to add shims to the highest foot of the motor. A soft foot condition occurs when one or more of the feet of a motor do not make uniform contact with the base or mounting surface. This situation can lead to misalignment, excessive vibration, and premature equipment failure.

Adding shims to the highest foot ensures that the motor base is level and correctly aligned. The goal is to raise the foot that is making less contact so that it aligns with the other feet, ensuring even support across all motor mounts. This method keeps the motor stable and minimizes stress on the components, which can enhance performance and longevity.

Considering the other options, shimming all four feet might lead to unnecessary adjustments and complexity without resolving the specific issue at hand. Shimming one foot often does not address the overall imbalance, and placing shims on two opposite feet could also introduce additional misalignment rather than correcting the primary issue with the soft foot. Thus, focusing on the highest foot optimally targets the problem while ensuring the motor mount is properly aligned.