. The Locomotive . a secure manner in theposition that has thus been determined for them. The line may thenbe removed from and replaced on these metal center points, wheneverit is found necessary to do so, without the necessity of relocating eachtime it is replaced. The alignment of the cross-head guide of the barrel type is a com-paratively easy matter. The joint between the cross-head guide cast-ing and the cylinder casting is usually made with a shoulder andcounterbore so that the two parts are automatically centered whenbolted together. All that is necessary with a new engine, therefore, i
. The Locomotive . a secure manner in theposition that has thus been determined for them. The line may thenbe removed from and replaced on these metal center points, wheneverit is found necessary to do so, without the necessity of relocating eachtime it is replaced. The alignment of the cross-head guide of the barrel type is a com-paratively easy matter. The joint between the cross-head guide cast-ing and the cylinder casting is usually made with a shoulder andcounterbore so that the two parts are automatically centered whenbolted together. All that is necessary with a new engine, therefore, isto set the guide level and bolt it tight to the cylinder. In the case of anold engine the surfaces of the slide itself should be tested for parallel-ism. This may readily be done with a pair of inside calipers, pre-ferably of the micrometer type. If they are found parallel the sameprocedure may be followed as in the case of a new engine. If notparallel, the surfaces should be machined to bring them into the proper. Fig. 7. 1921.] THE LOCOMOTIVE 205 relation with each other and with the faces of the flanges at the endsof the casting. As in the case of the reboring of a cylinder, onlya competent person should be entrusted with this work. After the cross-head guide has been firmly fastened in positionthe main frame, carrying the inboard bearing, may be moved intoplace. Since the joint between the cross-head guide casting and themain frame is similar to the joint at the cylinder end of the guide,the alignment of the two parts in question is readily attained. Do not,however, attempt to pull the main frame into place by tightening upon this joint as such procedure would strain the cross-head slide cast-ing if the two parts were not in exact alignment. The main framecasting should first be brought into perfect contact with the flange onthe cross-head slide, secured in that position by the wedges and founda-tion bolts, and the flange joint then made tight. The center line should now b
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