. Electric railway journal . Vertical Commutator Milling a Commutator forRepair Armature Leads are squared and the clamps tightened, after which the assembledcommutator is placed on a lathe chuck to bore out the latter are then tested for short-circuits. Next, the com-mutator bars are secured on the commutator core and a sec-ond short-circuiting test is made after the removal of theclamps. The commutator is then baked over gas to soften themica, after which it is tightened again and allowed to it is taken to a lathe to have the face turned and the barsslotted for the armatur
. Electric railway journal . Vertical Commutator Milling a Commutator forRepair Armature Leads are squared and the clamps tightened, after which the assembledcommutator is placed on a lathe chuck to bore out the latter are then tested for short-circuits. Next, the com-mutator bars are secured on the commutator core and a sec-ond short-circuiting test is made after the removal of theclamps. The commutator is then baked over gas to soften themica, after which it is tightened again and allowed to it is taken to a lathe to have the face turned and the barsslotted for the armature leads. Following this, a third short-circuiting test is made, and the commutator is shellacked at bothends. Finally, the commutator is pressed on the armatureshaft at three to seven tons pressure. The hydraulic press used. Commutator Slotter with Side and Upward Adjustment for this purpose also serves to remove the commutators. Notrouble has ever been experienced from loose are made with a taper of about 3/16 in. and are held by ajam nut between the oil deflector and the commutator end andby a collar shrunk on with a holding pin or dowel to preventturning. Instead of using a milling machine for cutting the bars forthe armature leads, the shops have devised a special tool post,which is employed for this work in connection with a cutterwheel on the arbor of a lathe. The general arrangement isshown in an accompanying illustration. It will be observedthat the commutator is set on the tool post, which, in turn, isset on the lathe carriage. The post is furnished with adjustable COST OF COMPLETE COMMUTATORS. WEST. 3 MOTOR. Commutator bars, 47^ lb., at 27}^ cts $* Mica, 3)4 lb., at $ * Four mica circles, at 75 cts. each One flat mica ring, at 70 cts. each 7» One vulcabeston rin
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
