Apparatus for finishing surface of commutator of motor

An apparatus for finishing an end surface of a commutator having an axis of rotation including a shaft, a core provided on the shaft, a coil wound around the core and a flat type commutator pressed onto the shaft and to which the coil is connected comprising:

• a) support means for supporting said commutator from opposite sides of the axis of rotation,
• b) measuring means for measuring an initial longitudinal distance between the end surface in unfinished condition and a reference position,
• c) data storage means for storing data measured by said measuring means, including a final longitudinal distance between the end surface in a finished condition and the reference position,
• d) tool means including a finishing tool for finishing the end surface on the basis of the measured data from said data storage means, said finishing tool being disposed at the final longitudinal distance from the reference surface for engagement with the end position,
• e) means for laterally moving said finishing tool with respect to the end surface while maintaining said finishing tool at the final longitudinal distance from the reference position to remove material of the commutator from the end surface such that all portions of the end surface in the finished condition are at the final distance from the reference position,
• f) means for rotating the end surface about said axis of rotation while said finishing tool engages said end surface,
• g) means for buffing said end surface, and
• h) a protective member for covering a portion of the commutator that is not required to be finished during buffing by the buffing means.