. The street railway review . in which passesthrough the frame and receives anut on the inside of the will be seen from the sketch,the core mold has a projectionsinking a short distance into theside of the frame, bringing itsFIG. 3. center into the same plane as the frame side, so that, should tliesurface of the core mold become roughened, the piece can be un-bolted, placed in a lathe and turned true. As the best metal in a casting is always found at the bottom thebearings are poured with the shoulder end down, giving the bettergrade of metal at the end where it is most needed. When t
. The street railway review . in which passesthrough the frame and receives anut on the inside of the will be seen from the sketch,the core mold has a projectionsinking a short distance into theside of the frame, bringing itsFIG. 3. center into the same plane as the frame side, so that, should tliesurface of the core mold become roughened, the piece can be un-bolted, placed in a lathe and turned true. As the best metal in a casting is always found at the bottom thebearings are poured with the shoulder end down, giving the bettergrade of metal at the end where it is most needed. When the armis swung into place for the pouring, it is held there by a smallhand clamp placed over the top. An iron half-ring (Fig. 3) at-tached to a handle is placed at the bottom of the shell to raiseit and give the proper depth to the this frame two men have poured 75 boxes in eight to a short time ago this company did not bore its babbittbearings, but as armature shafts are beginning to show signs of wear. it was thought best to commence boring the bearings to insure amore accurate fit. On placing some of the bearings in the latheMr. H. P. Clark, the master mechanic, discovered that owing tothe successive cooling and heating to which they had been subjectedin service and when pouring the babbitt linings, there was consid-erable variation in the diameter, some of the shells having spread1-32 in. out of true, and in order to obtain an accurate bore it wouldbe necessary to have a diiiferent sized chuck for nearly every shellon the road. He therefore devised a practically universal chuckwith screw adjustment by which he can bore any of the bearings,regardless of the variation in diameters. A sketch of this jig is shown in Fig. 4. Its interior diameter■s slightly larger than that of the bearing boxes, and the box tobe bored is supported on the points of eight micrometer set-
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
