. Railway mechanical engineer . red by measuring with a gage, hooking underthe bottom crosshead gib and measuring to the under sideof the jig. A special clamp with a hand screw is used forbringing the crosshead and jig into alinement, if common C-clamp is used to hold the taper gib in placeafter adjustment. Graduations shown on the taper gibs areso spaced that movement of the gibs the distance representedbv one graduation will vary the total width 1/32 in. It isthus an easy matter to adjust for any width of guide. Repeated tests have demonstrated that accurate babbittingof alligato
. Railway mechanical engineer . red by measuring with a gage, hooking underthe bottom crosshead gib and measuring to the under sideof the jig. A special clamp with a hand screw is used forbringing the crosshead and jig into alinement, if common C-clamp is used to hold the taper gib in placeafter adjustment. Graduations shown on the taper gibs areso spaced that movement of the gibs the distance representedbv one graduation will vary the total width 1/32 in. It isthus an easy matter to adjust for any width of guide. Repeated tests have demonstrated that accurate babbittingof alligator crosshead gibs is possible with these jigs. Cross-heads have been checked by laying two straight edges alongthe two wearing surfaces and measuring in front of thecrossheads at a distance equal to the stroke. The straightedges were found to be parallel to within 1/64 in. or less. Box Guide Suspended Type Crosshead Arrangements for babbitting the four-guide, or box-guide,suspended type crosshead are made by means of the special. Fig. 2—Pouring Babbitt in Alligator Crosshead Gib jig illustrated in Fig. 3. In this case a somewhat morecomplicated problem is encountered since the crosshead mustbe removed in such a way as not to damage the , the jig is made collapsible, and after thebabbitt has been poured it is possible to remove the twolower plates illustrated and release the crosshead from themandrel. The jig shown in Fig. 3 is adjustable and willaccommodate two classes of crossheads as shown in the adjustment of the box can be made by loosen-ing up two bolts, as shown, correct alinement being main-tained by means of the tongue and groove arrangementindicated. Particular attention is called to the constructionof the mandrel for holding the crosshead. It is made inthree sections, being held on the taper pin by means of a 1 in. steel spring. The taper pin has one threaded end ex-tending through the back plate and held by means of a 2 in. nut
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
