After resolving soft foot, what should be checked?

• A. End Float
• B. Vibration
• C. Run-out
• D. Alignment

Answer: (C)

Soft foot means the machine isn’t sitting flat, which can distort alignment readings. Once you’ve corrected the soft foot, the next essential check is run-out because it measures how true the rotating element’s axis is as it spins. If run-out is present, even a perfectly aligned pair of machines can still produce vibration and wear due to eccentric rotation, so you need to confirm the shaft, coupling, and mounting are true before finishing alignment. End float is an axial bearing movement check, and vibration is a symptom you’d observe, but run-out is the immediate step to verify the rotating accuracy after the soft-foot correction, ensuring subsequent alignment measurements are valid.