| Step 1: Select Bearing Number |
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| Bearing Number: | |
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| Bearing Type: | |
| Number of Balls/Rolling Elements: | |
| Ball Diameter: | |
| Pitch Diameter: | |
| Contact Angle (PHI): | |
| Ball Passing Frequency Outer Race (BPFO): | Orders |
| Ball Passing Frequency Inner Race (BPFI): | Orders |
| Fundemental Train Frequency (FTF) | Orders |
| Ball Spin Frequency (BSF): | Orders |
| Step 2: Enter Machine Running Speed (RPM): | |
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| (Click Button and/or Hit Enter to Generate Frequencies) |
| 1X - Machine Running Speed | Hz |
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| BPFO - Ball Passing Frequency of Outer Race | Hz |
| BPFI - Ball Passing Frequency of Inner Race | Hz |
| FTF - Fundemental Train Frequency | Hz |
| BSF - Ball Sping Frequency | Hz |
Faults in any of the four bearing components will generate specific frequencies dependent upon the bearing geometry and rotating speed. These four fault frequencies are commonly termed: BPFO - Ball Pass Frequency, Outer Race BPFI - Ball Pass Frequency, Inner Race BSF - Ball Spin Frequency FTF - Fundamental Train Frequency.
In this calculator, the bearing geometries for more than 2,700 bearings including: SKF, NTN, Cooper, and Dodge are available. Simply select the bearing from the database, then enter the machine running speed, to generate the desired fault frequencies.
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