A Manual of Machine Drawing and Design

A Manual of Machine Drawing and Design

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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. 1908 edition. Excerpt: ... the tight and slack sides of a rope corresponding to various values of the coefficient of friction /j and the angle of contact n from the formula: --T Log ppl=-00758 /, -, which has been already given in connection with belt gearing. Tj = tension on tight side, and T2 = tension on slack side. Values of the Ratio of the Tensions on the Tvjlit and Slack Sides of a Rope when on the Point of Slipping. 193. Power Transmitted by Ropes.--Lot T1 be the tension on the tight or driving side of a rope, and T, the tension on the slack side. The driving force is then Tj-T2 = P. Let H be the horse-power transmitted by one rope, and V the velocity of the rope in feet per minute; then The following table has been calculated on the assumption that T fj? = i, and that the greatest stress on the rope is 140 lbs. per square 2 inch of the gross section of the rope, so that the driving force P = Tt-T2, is 105 lbs. per square inch of the gross section of the rope. The formula for the horse-power for one rope then becomes H D2V =-jjr very nearly, where D is the diameter of the rope. If C, the circumference of the rope, he used instead of the diameter, then H = C2V C2V 3949-44 orsay 4000 Mr. Alfred Towler, of Leeds, gives the following formula for power transmitted by ropes: --C2V(y-l) the 5000 Where H = horse-power transmitted. C = circumference of rope in inches. V-velocity of rope in feet per minute. N = number of ropes. CHAPTER XII. WIRE-ROPE GEARING. 194. Telodynamic Transmission.--This is the name given to the method of transmitting power to long distances by means of pulleys and wire-ropes. This method was first introduced by M. Ch. F. Him in the year 1850, and since that time it has been used extensively, chiefly on the Continent of Europe. The ropes used in
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Product details

  • Paperback | 92 pages
  • 189 x 246 x 5mm | 181g
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236596331
  • 9781236596338