File:The Street railway journal (1896) (14575014810).jpg

Identifier: streetrailwayjo121896newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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hine bores the motor frame and turns off the pole pieces, and atthe same time, bores out the trunnions forthe yoke. The winding of armatures is carried onin a special department. For all generatorarmatures and for all motor armatures ofover fifty horse power, the Walker Companyuses flat copper ribbons in place of wires ofthe ordinary circular section. The ribbonsare first cut to the length required (qT asingle coil. They are then fitted to theproper shape by a special machine, designedfor the purpose by the manager of the wind-ing department, J. B. Elliott. This ma-chine, which is extremely ingenious in con-struction, can bend the ribbon edgewisethrough an angle of i8o degs. on a very shortradius without making a break in it. Theterminals are then tinned, and the ribbonsare straightened on the flat surface of a table.Several are then tied together, either two orfour, depending on the size of the generator,and are placed in a wooden frame and bentto shape. They are then taped by girls.
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FIG. 11.—TESTING DEPARTMENT. of the shop comes into valuable use in finisliing the parts of theselarge generators, and many of the machine tools in use werebuilt especially for the purpose for which they are now employed.This enables all parts, even the largest, to be finished both quickly FIG. 10.--A ROW OF ARMATURE WORKERS. Samson tape is first used, a double layer ofthis being employed. Linen tape is thenwrapped around the outside. When two par-allel conductors are used in the same coil,fuUerboard is placed between the two, andthe same is then taped twice outside of thelinen. With the seventy-five horse power mo-tors, mica is then wrapped outside of thelinen tape. Fig. 3 shows a 400 k. w. generator arma-ture in the process of winding. The troughin wliich the conductors rest when in thearmature slot is composed as follows: first,fullerboard, then oiled paper, then mica, thenoiled linen, then another trough of fullerboard. The tape is protected by a hardwoodstrip in the top of the

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