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Vibration analysis can be used to determine if a soft foot condition exists on a machine that is running. If you cannot shut the machine down to check for soft foot, using the simple procedure outlined in this article will help determine if soft foot is your problem:
When corrections are not made to eliminate a soft foot condition, the foot will deflect when tightened. This will affect the alignment and the motor air gap, and can cause significant vibration at rotational speed. By loosening the foot while running, the force deflecting the foot is removed.