. Railway mechanical engineer . Fig. 3 cylinders. However, if the jaws have not become wornenough to recjuire much filing or milling, scribe a line acrossEF true with the face of the front jaw, and from the point/, its intersection with the line EF, lay off on the line EF,a distance equal to one-half the standard width of the drivingbox, plus the standard thickness of the shoe. Prick-punchthis center, which is L. .other method to be used when the jaws are worn, is tolocate the jaw centers midway between the points / and point K is obtained by scribing perpendicular to theline EF from a p
. Railway mechanical engineer . Fig. 3 cylinders. However, if the jaws have not become wornenough to recjuire much filing or milling, scribe a line acrossEF true with the face of the front jaw, and from the point/, its intersection with the line EF, lay off on the line EF,a distance equal to one-half the standard width of the drivingbox, plus the standard thickness of the shoe. Prick-punchthis center, which is L. .other method to be used when the jaws are worn, is tolocate the jaw centers midway between the points / and point K is obtained by scribing perpendicular to theline EF from a point on the face of the back jaw threeinches from the top of the jaw. Whichever method is. Fig. -Inlshing the Face of a Shoe center, and with the trams set any convenient distance scribetwo arcs intersecting the line EF at P and Q. Then withF and Q as centers scribe intersecting arcs on the shoe neat-each end and lightly prick-punch the intersection of the arcs. Set the dividers from either .V or O to the line GH, andusing as a center the prick-punch first made on the inside-of the front jaw, lay off this dimension on the inside ofthe shoe, and lightly prick-punch. The shoe is now laidoff, and it should be planed to within 1 in. of these marks, agage being used to test the work after planing. After thefinish cut has been taken, the point of the gage should enterthe prick-punch mark without crowding. The shoes on the other jaws may be laid off by trammingfrom the main jaw centers on each side of the engine, withthe trams set to the length of the side rods and proceedingas with laying out the main shoes. If the firebox orsome other obstruction prevents doing this, tram from a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
