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Table 1 Characteristics of bearings health conditions in the first bearing dataset

From: Connected Components-based Colour Image Representations of Vibrations for a Two-stage Fault Diagnosis of Roller Bearings Using Convolutional Neural Networks

Condition Characteristic
NO The bearing is brand new and in perfect condition
NW The bearing is in service for some time but in good condition
IR Inner race fault. This fault is created by cutting a small groove in the raceway of the inner race
OR Outer race fault. This fault is created by cutting a small groove in the raceway of the outer race
RE Roller element fault. This fault was created by using electrical etcher to mark the surface of the balls, simulating corrosion
CA Cage fault. This fault is created by removing the plastic cage from one of the bearings, cutting away a section of the cage so that two of the balls were not held at a regular space and free to move