File:Railway master mechanic (microform) (1895) (14761247792).jpg

Identifier: railwaymastermec33newy (find matches)
Title: Railway master mechanic (microform)
Year: 1895 (1890s)
Authors:
Subjects: Railroads Railroads
Publisher: New York : (Simmons-Boardman Pub. Corp.)
Contributing Library: MIT Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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making runs of from 291,400 to 339,760miles; (3) other things being equal, the crank axles of en-gines of the 4:4:2 class gave less service than those onengines of the 4:4:0 class, and on the former enginesaxles of annealed open-hearth steel have developed cracksafter runs of from 45,800 to 124,000 miles. The axles crack always in the filleted angles A or B. Fig.1, under the influences of the violent shocks in service, thedynamic effects of the shocks being concentrated at thesepoints, where they cannot be absorbed by the elasticity of themetal. Permanent deformation is set up, and in time a crackappears; its development is often facilitated by defects inthe metal resulting from the segregation of metal in theingot. In order to avoid the formation of these cracks. Mr.Fremont, chief of works at the School of Mines, has devised Mr. Cremeans portrait appears on page 198. *From a paper by E. Hallard, Asst Mechanical E-ngineer.Southern Ry. of France. 240 RAILWAY MASTER MECHANIC June, 1909.
Text Appearing After Image:
Weir & Craig Turntable Tractor at Work. the plan of culling away the crank web in the part betweenthe journal and the crankpin, as shown in Fig. 2. With thisarrangement, the dynamic effects are not concentrated at apoint, but are distributed around C and D, over the largestpossible amount of metal, and the elasticity of which canabsorb them. This method also removes the defective metalthat may occur in the axis of the ingot. Fig. 2 shows thearrangement for double-web cranks on straight axles, aswell as for single-web cranks on bent or oblique axles. Five axles of the oblique type, which showed cracks afterruns of 106,480 to 213,195 miles (on engines of the 4 : 4 : 0class) had the webs slotted out in the Fremont plan so asto remove all traces of the cracks. Since then (and up toOctober, 1908) they had run for from 29,080 to 92,253 miles,and had shown no signs of cracks. Four new crank axles with slotted webs were put in serv-ice on engines of the 4 : 4 : 2 class (with which cracks

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