Canadian transportation & distribution management . necessary for cast the flask is filled, and rammed full tothe level of the top of the flask, the surfaceis treated with a layer of separating sand,and the cope placed on top and similarlyrammed full of sand. At the outer end ofthe slabbed portion of the frame, the pour-ing gate is located, with four risers or sprueholes at intervals along the length of theframe. The construction of the cope and flasksthat hold the moulds is in itself a heavy saturation of molasses and this treatment of the flask, thecope is carried a
Canadian transportation & distribution management . necessary for cast the flask is filled, and rammed full tothe level of the top of the flask, the surfaceis treated with a layer of separating sand,and the cope placed on top and similarlyrammed full of sand. At the outer end ofthe slabbed portion of the frame, the pour-ing gate is located, with four risers or sprueholes at intervals along the length of theframe. The construction of the cope and flasksthat hold the moulds is in itself a heavy saturation of molasses and this treatment of the flask, thecope is carried across and placed on topof the flask and treated in a like two are then placed in the oven fora thorough baking. The resultant mouldmust be much harder and more solid thanfor cast iron moulds. Following the bakingof the moulds, the halves are secured to-gether as shown to the left in fig. 1. Gates,as indicated, are built up around the pour-ing hole and risers. Next in order comes the pouring of themould, illustrated in fig. 2. One of the. -Frame Immediately after being Cast Fig. 4.—Section of Frame, Showing Test Bar. The point that impresses the writer mostforcibly is the striking difference in weightsbetween the casting as it comes from themould, and the same casting as it is finallyready to be built into the locomotive; thelatter is less than half the original of the various steps in theproduction of the frame will explain thereasons for the big difference. As a typicalexample, the frame for a small six wheelswitching engine has been selected for de-scriptive purposes, it being the intention tofollow this frame through from the patternstate to the time when it is ready for de- rather interesting, being of an exceptionallygood design. The handling of moulds forlong thin castings, is a more or less diffi-cult task unless both cope and flask areparticularly solid, for on account of thegreat length the whole sags in the precludes the u
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherdonmi, bookyear1913
