The axial vibration was negligible (low 1x), but the phase difference across the coupling was 178°. The shaft was bent by 0.002 inches TIR (Total Indicator Reading) near the inboard bearing.
Practical Case Studies on Vibration Analysis: A Real-World Guide to Machine Health Practical Case Studies On Vibration Analysis Pdf
These companies publish Application Case Studies documents (usually free registration). Their PDFs focus heavily on bearing defect frequencies with actual vibration signatures from their testing rigs. The axial vibration was negligible (low 1x), but