. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM MOTORS 323 ient to attach, but are not so durable as those made of metal. Metal pulleys are sometimes covered with leather in order to increase the friction of contact with the belt. Pulleys from which belts are not to be shifted should have a crowned face. This will cause the belt to keep in the center of the pulley, owing to the fact that the belt always tends to run to the highest part of the pulley
. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM MOTORS 323 ient to attach, but are not so durable as those made of metal. Metal pulleys are sometimes covered with leather in order to increase the friction of contact with the belt. Pulleys from which belts are not to be shifted should have a crowned face. This will cause the belt to keep in the center of the pulley, owing to the fact that the belt always tends to run to the highest part of the pulley. The pulley which supplies the power is generally spoken of as the driver, and the one receiving the power is designated as the driven pulley. Calculating the Speed. It is an easy Fig. 203^ a plain matter to calculate the speed or the diam- cast"iron Puller- eter of the pulley, when it is remembered that the diameter of the driving pulley multiplied by its revolutions per min- ute is equal to the diameter of the driven pulley multiplied by the number of its revolutions per minute. If any three of the four quantities involved are known, the fourth may be easily obtained. Link Belting. A common method of transmitting power in agricultural machinery is by means of link belting running on sprockets. Link belting is positive in its action, as there can not be any slippage. It is very strong, but its use is often objectionable on account of the noise which it makes and because Fig. 204. a spnt it cannot be operated at high speed. There are several styles in use; in some the links or sections are made of malleable iron, and in others of pressed steel. Again, some expensive chains are made of steel rollers with short steel links riveted on the side. Rope Transmission. Where power is to be transmitted some distance and where the shafts are not parallel. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1919
