Make tools, fittings, and small metal pieces used in other products.
Tests electrical units, such as lamps, coils, armatures, and commutators to determine shorts, grounds, or efficiency of unit, using test lamp, meter, or growler: Clamps test wires to electrical unit, screws unit into socket, or inserts lead wires into mercury tube to make contact with testing device. Turns dials to set controls of test equipment and observes meter or test lamp which indicates acceptability of unit. Places armature in growler and manually rotates armature under steel strip. Listens for growling sound and watches for attraction of steel strip to armature surface indicating short circuit. May inspect unit and remove excess solder, mica, or copper chips, using buffing machine, pick, or brush. May demagnetize coils, using demagnetizing equipment. May test carbon pellets with attached shunt wires to determine current flow through pellets, during production of carbon brushes. May be designated according to unit tested as Armature Tester II; Carbon Brushes Tester; Coil Tester; Commutator Tester; Electric-Switch Tester; Light-Bulb Tester; Resistor Tester.