. The railroad and engineering journal . f ,! if 293l lij 1 1/. l/j ih u\ I3V h\, 1| 1 ] I m i]ii 1.; lis drical, as shown in figs. 323 and 324, with grooves cut on theoutside to hold a wrench. Question 517. Why is it often essential to adopt some meansto prevent nit Is from turning or unscrewing ? Answer. When bolts and nuts are exposed to vibration, it isfound that a slackening is very liable to occur, so that the ex-cessive vibration on locomotives requires that many of the nutsshould be locked in some way. Question 51S. How are nuts prevented from turning? Answer. The simplest plan, a
. The railroad and engineering journal . f ,! if 293l lij 1 1/. l/j ih u\ I3V h\, 1| 1 ] I m i]ii 1.; lis drical, as shown in figs. 323 and 324, with grooves cut on theoutside to hold a wrench. Question 517. Why is it often essential to adopt some meansto prevent nit Is from turning or unscrewing ? Answer. When bolts and nuts are exposed to vibration, it isfound that a slackening is very liable to occur, so that the ex-cessive vibration on locomotives requires that many of the nutsshould be locked in some way. Question 51S. How are nuts prevented from turning? Answer. The simplest plan, and the one which is most fre-quently employed, is that shown in figs. 325 and 326, which issimply a second nut screwed on over the first and tighteneddown upon it. Lock nuts are usually made thinner than themain nut, and when that is the case, it is argued that the thin- Fig- 319- Fig. 323. Fig. Fig. 320. Fig. 322. Fig. 324. Fig. ^2b^ nest nut should be screwed on the bolt first, because if the secondnut is screwed down hard on the first one, the strain on the boltis borne by the one last screwed on. When lock nuls are used, if the total thickness of the two nutsis equal to about one half more than the ordinary proportionfor the thickness of nuts, it will be found that sufficient hasbeen done to insure a perfect locking. When the object is merely to prevent nuls from unscrewingand being lost, what are called split keys or cotters are are sometimes round, tapered pins, shown in figs. 319and 320, which are divided or split so that the two parts can bebent into the form shown in fig. 320. In other cases they aremade of flat pieces of metal, as shown in figs. 321 and 322, whichare beat as shown in fig. 322, Question 519. What are the shapes of bolt-heads ? Answer. They are made in a variety of forms according totheir use, but usually they are either square or hexagonal
Size: 1974px × 1265px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookidrailroadengi, bookyear1887
