. The Street railway journal . d by the eccentric sleeve to take off the proper cut,and the grinding wheel slowly fed across the commutator bythe hand wheel shown in the figure. It will be seen that the commutator is thereby trued withreference to its true center of rotation, which may or may notcorrespond with the centering marks in the ends of the shaft,and in this respect the device does a truer job than if the com-nuitator were turned in a lathe. The wheel used is of a special composition, and contains no June 3, 1905.] STREET RAILWAY JOURNAL. 999 emery or other mineral matter wliich would
. The Street railway journal . d by the eccentric sleeve to take off the proper cut,and the grinding wheel slowly fed across the commutator bythe hand wheel shown in the figure. It will be seen that the commutator is thereby trued withreference to its true center of rotation, which may or may notcorrespond with the centering marks in the ends of the shaft,and in this respect the device does a truer job than if the com-nuitator were turned in a lathe. The wheel used is of a special composition, and contains no June 3, 1905.] STREET RAILWAY JOURNAL. 999 emery or other mineral matter wliich would injure the insula-tion between commutator segments. The cut which the wheelmakes is peculiarly clean and satisfactorily cut, there being notendency to drag the copper across from segment to the job is complete, every segment will show the fullwidth of the mica between bars. It is well known that it isvery difficult to do a good job where a commutator is insulated SINGLE-PHASE LOCOMOTIVE FOR HEAVY RAILROAD SERVICE. FIG. 1.—DETAILS OF COMMUTATOR TRUING DEVICE with hard India mica, on account of the action ofthe mica on the tool, no tool point being able to re-sist it. The Jordan commutator grinding device grindsdown both copper and mica alike to the same height,and the commutator is as true when the work is com-plete as if it were turned in a lathe out of one pieceof metal. The device is thoroughlv well made; the shaft re-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
