Calculate bearing, gearbox, and machine defect frequencies.
Accurately calculate bearing defect frequencies, gear mesh frequencies, belt pass frequencies, and motor electrical frequencies with professional-grade calculators designed for vibration analysts. Enter your machine parameters including RPM, bearing geometry, gear tooth counts, or motor specifications to instantly determine the exact frequencies where faults will appear in your vibration spectra.
These free fault frequency calculators cover all major machinery types including rolling element bearings (BPFO, BPFI, BSF, FTF), simple and multi-stage gearboxes, epicyclic/planetary gears, blade/vane pass frequencies, belt drive systems, and induction motor electrical frequencies. Essential tools for setting up monitoring parameters, validating diagnostic findings, and training vibration analysts. Calculate fault frequencies instantly and improve your diagnostic accuracy.
Contact angle is 0° for most radial bearings
Use 15-25° for angular contact bearings
Check bearing manufacturer data for exact geometry
Results show fundamental frequencies - harmonics occur at multiples
GMF sidebands at shaft speeds indicate wear
Multi-stage: each stage has unique GMF
Planetary gears show complex frequency patterns
Hunting tooth frequency = shaft speed / LCM ratio
Belt length auto-calculates from geometry
BPF harmonics indicate belt defects or tension issues
Blade/vane pass frequency = RPM × number of blades
Use for fans, pumps, compressors, turbines
2× line frequency (100/120 Hz) is most common
Slip frequency sidebands indicate rotor bar issues
Pole pass frequency relates to motor design
Use actual measured RPM for accurate slip calculation
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