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Gerd Fischer ist Autor der bekannten Lehrbücher "Lineare Algebra" und "Analytische Geometrie" und Professor am Mathematischen Institut der Universität Düsseldorf.
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Radius of the centre of gravity of the balance weight. weight of the crank pin plus half the weight of the connecting rod. the radius of the crank. weight of the piston, piston rod and crosshead. for horizontal engines W W IT for vertical engines = for locomotives it may (W 2 be taken that W = W -. CRANKS, CRANK DISCS, AND CRANK SHAFTS. 47 in the same plane in which the it is wrong to balance the crank, connecting rod, piston, and crosshead by applying the balance weight The employment of crank discs, figs.
Figs. show the section of a crank shaft brass when new 132, 133, and after the lower many fig. years wear, how the 7/T- shows 132 and 133. * Crank shaft and other similar brasses have a tendency to close in and pinch the shaft as they become warm, to avoid this trouble two- part brasses should be bored out 0'5 per cent, and four-part brasses 0-8 per cent, larger than the diameter of the shaft, attention to thi* point would often save trouble in ordinary shafting, the brasses of which are often sent out a tight fit on the shaft and have generally to be filed or scraped out until they are a comparatively loose fit.
Figs. 117 123. Fig. 113. i>arts for small engines. Bearings witli brasses in three parts for medium-sized engines. - Bearings with brasses in four parts for large engines. 38 DETAILS OF STEAM ENGINES. Figs. 124 and Figs. 12C 125. and 127. 127 show two different designs of bearings ; in one, Fig. Figs. 124 124, the adjusting wedge is difficult to fit in, and in fig. 126, if desirable to cover up the wedge at the sides, the flanges of the brasses require to be very deep. Fig. 128 shows the bearings of cast iron or cast steel lined with white metal.