Bearing principle is very simple: objects rolling easier than slide.
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it is a mechanical equipment to reduce friction. It is used in moving parts very often.
Any bearing ball or race that is not in good shape, worn, cracked, insufficiently lubricated.Over tightening the bearing can cause overheatingMissalignment is a fault (thoug not of the bearing itself)Dirt
The bearing number can be checked out depends on the size of ID (Inner Diameter), OD (Outer Diameter) and H (Height) of this bearing.
It is not known who specifically invented the roller ball bearing. There are examples of their use by the ancient Egyptians. However, it is thought that they may have been invented before the wheel.
The type of bearing that would be fitted to a fractional kW electric motor will depend on the model and maker of the motor. Deep grove ball bearings are the most common bearings used.