. Locomotive engineering : a practical journal of railway motive power and rolling stock . o a new guideyoke, and new guide blocks are necessary. have it just flush with the head. Then,with the dividers set to any convenientradius, scribe the arcs I and 2 across theline tt b. Make a small center punch markat the intersections of the line and arcs;then with these intersections as centers,and a little longer radius than arcs i and 2were drawn with, draw arcs 3 and 4. Calltheir intersection point g. With a straight-edge draw the line c d through g and thecenter of stuffing box, when it will be at
. Locomotive engineering : a practical journal of railway motive power and rolling stock . o a new guideyoke, and new guide blocks are necessary. have it just flush with the head. Then,with the dividers set to any convenientradius, scribe the arcs I and 2 across theline tt b. Make a small center punch markat the intersections of the line and arcs;then with these intersections as centers,and a little longer radius than arcs i and 2were drawn with, draw arcs 3 and 4. Calltheir intersection point g. With a straight-edge draw the line c d through g and thecenter of stuffing box, when it will be atright angles to a b. Now draw e f throughthe center of stuffing and parallelwith o b. The width of the guides is .5inches, and the distance between them 5^inches. Hence the distance from 0 to hand i, Fig. 15, is 4/i inches, which is equalto half the distance between the guidesplus half the width of guide. Draw h Iand 1 ni parallel with c d and 4J4 inches oneach side of it. The centers of the guide-block holes will lie in these lines, and acertain distance above the line e f, which. ^-<3t^ Fig. J6 Fig. 17 Before putting the guides up they shouldbe faced to a face-plate and at right anglesto the edge. The ends should be planedslightly below the wearing surface. Steelguides can usually be made nearlystraight by springing them under a press,after which they can be finished by filing,using a coarse file first, then finishing bydraw-filing with a fine file. It is notnecessary to use a scraper. The guides are now ready to be put up,but as we are to have a new back cylinderhead and new guide yoke, the holes for theguide-blocks must first be laid out anddrilled. To lay out the holes in head,fasten it in place, then by means of astraight-edge across the frames scribe theline a b. Fig. 15, then draw c d at rightangles to a b. and through the center 0 ofstuffing box. It is sometimes inconvenient to use asquare for drawing line cd; hence we willuse dividers and small straight-edge.
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Keywords: ., bookcentury1800, bookdecade1890, bookidlocomotiveen, bookyear1892
