Successful farming : a ready reference on all phases of agriculture for farmers of the United States and Canada . or fourhundred revolutions per minute. A shaft should be driven from thecenter if possible and between two bearings, and transmit its power to aseries of pulleys on either side of the main drive. If possible, heavy shaftsshould have their bearings or hangers rest upon posts which are directlyconnected with the ground, because there is always more or less give ENGINES, MOTORS AND TRACTORS 749 in the average floor, especially if heavy storage should be above. Lineshafting hangers sho
Successful farming : a ready reference on all phases of agriculture for farmers of the United States and Canada . or fourhundred revolutions per minute. A shaft should be driven from thecenter if possible and between two bearings, and transmit its power to aseries of pulleys on either side of the main drive. If possible, heavy shaftsshould have their bearings or hangers rest upon posts which are directlyconnected with the ground, because there is always more or less give ENGINES, MOTORS AND TRACTORS 749 in the average floor, especially if heavy storage should be above. Lineshafting hangers should not be over 8 feet apart and if the shaft is light,not more than 6 feet apart. The horse power of a good shaft may befigured in the following manner: Multiply the cube of its diameter by the number of revolutions perminute and divide the result by 82 for steel and 110 for iron. In otherwords, The amount of power that can be transmitted by two shafts ofsimilar quality varies directly with the speed and with the cubes of theirdiameters. The twisting strain on a shaft is greatest near the main drive; there-. Engine Operating Pump fore, the nearer the main drive is to the hanger, the more nearly willits strain be counteracted. A disregard of any of the above principlesis calculated not only to waste power, but gives an unsteady energy to themachine driven and affects both the efficiency and life of the machine beingdriven by it. Speed of Shafting.—If only one machine is to be driven by a shaftthe problem of shaft speed is very simple. With the operation of a creamseparator at a speed of 60 revolutions per minute and a wood saw at aspeed of 400 to 600 revolutions per minute as well as other varied speeds,the problem is more difficult. It is at this point that many very large,expensive pulleys and a number of very small pulleys upon which belts 1 Courtesy of The Christensen Engineering Company, Milwaukee, Wis. 750 SUCCESSFUL FARMING do not work very successfully are used
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
