Making Paper Volume 5

Making Paper Volume 5

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...other is the pull in the belt which is the cause of the tendency to slip. Therefore, when a belt slips on a pulley, assuming that the belt is pli able and conforms readily to the face of the pulley, it may be either because the coefficient of friction between the belt and the pulley is too low, or because the belt pull is too great. In probably nine hundred and ninety-nine cases out of a thousand, it is because the belt pull is too great, and manifestly the logical and rational thing to do is to decrease the belt pull, not only because it constitutes the removal of the cause of the trouble, but because it decreases the wear on the belt and decreases the friction in the bearings, and as a consequence reduces the demand on the coal pile and the drain on the money box, while increasing the coefficient of friction accomplishes none of these advantages. The amount of power a belt transmits is calculated by multiplying the belt pull by the belt speed, so it will be seen that if the belt speed is increased the belt pull can be decreased, and the same power will result. For instance: If the belt pull is 800 lbs. and the speed 3000 ft. per minute, the same amount of power is being transmitted as if the pull were 600 lbs. and the speed 4000 ft. per minute, and when you stop to figure that in addition to the amount of pull which is involved in the transmission of power there is a tension in the belt on both the pulling and slack side when the drive is standing still, which throws a side pull on the bearings of pretty close to twice the working pull, it will be seen that cutting down the belt pull means a great deal. In this illustration the total reduction in the side pull on the bearings is something like 600 lbs., while the pull tending to more

Product details

  • Paperback | 194 pages
  • 189 x 246 x 10mm | 354g
  • United States
  • English
  • black & white illustrations
  • 1236772210
  • 9781236772213