Tolerance Check is the process that increase the efficiency and reliability of electric motor by removing or reducing looses incur by low insulation or worn out parts.
A commutator is a moving part of a rotary electrical switch in certain types of electric motors and electric generators that periodically reverses the current direction between the rotor and the external circuit.
Rotating machinery will usually give warning sign before failing we are here to identify does warning sign and warn you before a breaker down might happen.