. The railroad and engineering journal . y the -iuidth 0/ the face and the diameter of the ptilley together, and divide by the number of spokes. Take the cube root ofthe quotient and, for single belt pulleys, multiply it by ;for double bells multiply ^ ; the product will be the diameterIV of the circle at the center. The diameter w at the lim shouldbe s of W. The thickness of the arms should be i their may be laid off at a and b fig. 180, a being equal to J wand / equal to J ff. A rib r /• is cast on the inside of the rim between the spokes,to strengthen the rim. This r
. The railroad and engineering journal . y the -iuidth 0/ the face and the diameter of the ptilley together, and divide by the number of spokes. Take the cube root ofthe quotient and, for single belt pulleys, multiply it by ;for double bells multiply ^ ; the product will be the diameterIV of the circle at the center. The diameter w at the lim shouldbe s of W. The thickness of the arms should be i their may be laid off at a and b fig. 180, a being equal to J wand / equal to J ff. A rib r /• is cast on the inside of the rim between the spokes,to strengthen the rim. This rib is of the same thickness asthe spokes, and its projection c from the rim is also equal totheir thickness. The radii d and e, fig, 179 of the curves whichjoin the spokes to the rim and to each other are entirely arbi-trary, and may be left to the judgment and taste of ihe drafts-man. Alter locating the center of one of each of these curves,arcs of circles should be drawn from the center O through each BELT PULLEY. Scale fr^.in.^ Fig. 181. FULL SIZE SECTION OF SPOKE ON LINE point, where a center must be located. This facilitates thefinding of the exact position of the centers, which will be in thearcs thus drawn. Vol. LXIV, No. II.] ENGINEERING JOURNAL. 517 The length L ai the hub, fig. 180, is usually made three-quarters the width of the face, and the thickness of the metaloutside the shaft may be calculated as follows : Mulliply the di- Fig. 182SADDLE KEY. Fig-. ON FLAT.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
