Rolling Element Bearing Problems
Note: X = rotating frequency
ftf = fundamental train frequency (approx. = .38X to .42X)
bsf = ball spin frequency (approx. = 1.5X to 3X)
bpfi = ball pass frequency, inner race (approx. = 4X to 10X)
bpfo = ball pass frequency, outer race ( approx. = 2X to 7X)
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Defective Inner Race single defect , small |
Non-synchronous peaks |
Radial load |
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Defective Inner Race single defect, moderate |
bpfi, with harmonics and 1X sidebands |
Amplitude modulated |
Non-synchronous peaks with 1X sidebands |
Radial load increases levels |
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Defective Inner Race two or three defects, small |
bpfi and prominent harmonics |
broad band |
Broadband noise level increases |
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Defective Inner Race multiple small defects with rough-ness around entire race |
Non-synchronous peaks |
Broadband noise level increases |
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Defective Outer Race single defect, small |
Non-synchronous peaks |
Harmonics higher in level than fundamental |
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Defective Outer Race single defect, moderate |
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Defective Ball or Roller single defective ball |
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multiple defective balls |
bsf and harmonics |
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