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(2) Check continuity between commutator and shaft with ohmmeter. Replace armature if there is continuity. (3) Place armature on V-blocks, and measure runout with a dial indicator. if runout is not within specification, repair armature with a lathe or replace armature. Runout : 0.002in (0.05mm) (4) Replace armature if diameter or commutator mutator is at, or less than, grind limit. (5) If commutator surface is dirty, wipe it with a cloth ; if it is rough, repair it with a lathe or fine sandpaper. Grind limit : 1.22in (31mm) (6) If depth of mold between segments is at, or less than minmum, replace armature. Depth : 0.02~0.03in (0.5~0.8mm) |