The balls are in permanent contacts with inner and outer raceways at the same time at the accelerometer PK1 attached location.
It was possible to evaluate micro-defects separately of both inner and outer raceways and balls through vibration measurements using both output vibration signals from PK1 and PK2 transducers.
With grease and preloads F1 = 100 N bearing vibration acceleration magnitudes are 2-2.5 times greater at accelerometer PK1 measurement location in comparison with PK2 data, as ball shocks at outer and inner raceways were more intensive in comparison with outer raceway at PK2 accelerometer location.
4, a) indicated low frequency 700 Hz vibration acceleration amplitudes in the spectra of both PK1 and PK2 transducers output signals.
Vibration intensity is of the same values measured with accelerometers PK1 and PK2.