A Treatise on Belts and Pulleys; Embracing Full Explanations of Fundamental Principles

A Treatise on Belts and Pulleys; Embracing Full Explanations of Fundamental Principles

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: ...belt-width of b = 22 inches. 11. Leather Belts oyer Leather.covered Pulleys. As we have demonstrated in the foregoing pages, the average leather belt will not transmit a force equal to its strength, for the reason that it will slip upon its pulley before it will break. If we can conveniently increase the adhesion between the belt and pulley, --i.e., increase the coefficient of friction, --and in this way prevent slipping, the belt can be made to do more work without increasing its size. Various methods have been from time to time proposed for obtaining a greater coefficient of friction, such as coating the pulley-faces with gum, rosin, etc.; but these methods have more often than otherwise proved useless, from the fact that the belt is soon rendered stiff and clumsy by the substance placed upon the face of the pulley. Probably the best of all contrivances in use for this purpose is the pulley with a leather.covered face. The leather is easily fastened securely upon the pulley, and we have then practically a leather belt running over a leather pulley. A series of carefully tried experiments has given the coefficient of friction for leather belts over leather.covered pulleys equal to 0.45-0.05 greater than that for leather belts over cast.iron pulleys. If we substitute cp = 0.45 successively in formulas (40), (41), and (42), and reduce, we shall obtain for leather belts over leather.covered pulleys the following expressions: T log--= 0.1953a;.... (238) when a is expressed in circular measure, ' T logj = 0.00341-;.... (239) T Reuleaux says: "For a covering entirely new the value of--is between 6 and 7; after some service this value decreases, but still does not become less than 4 to 5; the arc embraced by the belt being equal T to it....
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Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236621131
  • 9781236621139