. Automotive industries . ined,are dropped into the pan of the automatic completelyfabricated except for grinding. These Gridley and Na-tional Acme automatic machines comprise the bulk ofthe machining department at the Timken factory. In theautomatic screw machine processes where the rods arefabricated into a variety of sizes of rolls, the machiningtolerances are not in excess of .003 of an inch. Thetolerances on the cups and cones are .004 of an inch. After the machining processes are complete and theparts have been gauged to size to find that they arewithin the limitations of the tolerances
. Automotive industries . ined,are dropped into the pan of the automatic completelyfabricated except for grinding. These Gridley and Na-tional Acme automatic machines comprise the bulk ofthe machining department at the Timken factory. In theautomatic screw machine processes where the rods arefabricated into a variety of sizes of rolls, the machiningtolerances are not in excess of .003 of an inch. Thetolerances on the cups and cones are .004 of an inch. After the machining processes are complete and theparts have been gauged to size to find that they arewithin the limitations of the tolerances given, the prod-ucts are placed in carburizing furnaces where the rolls,cups and cones remain from 16 to 48 hours, the time vary-ing in accordance with the size of the part. Here thecarbon content of the surface of the steel is increased bythe aid of bone meal. The small parts are placed inrotary retort hardening furnaces where they are hard-ened after carburization. April 28, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 913.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
