Proceedings of the Engineers' Society of Western Pennsylvania Volume 21, No. 1

Proceedings of the Engineers' Society of Western Pennsylvania Volume 21, No. 1

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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. 1905 edition. Excerpt: ...velocity of the rope. In figures 6 to 11 we see the difference in the length of compensating motion instrands required by reason of the difference in the diameter of two sheaves. Fig. 6 represents a sheave of 60 inch diameter and Fig. 9 one of 30 inches diameter. Figures 8 and 10 show in exaggerated scale the relative differences between outer and inner arcs of a rope, in a length of six diameters; and Figures 7 and 11 show the amount of compensation required in each case. By the use of a scale we find that those lengths are inversely as the diameters of the sheaves. In connection with the bending act it is to be said that the straightening of the rope does not require any external force, because in the act of bending the elastic resistance of the strands must be overcome, whereby energy is stored in those strands in the same manner as by compressing or stretching a spring which resumes its original state upon being released. Therefore, the energy required to straighten the rope is imparted to the rope while it is being bent. It stands to reason that there is a limit to the compensating capacity of the strands in a rope, but where that limit lies can be determined only by actual trials under working conditions. This task by right falls upon the manufacturers of wire rope, in whose interest it is to furnish their customers reliable information concerning the proper use of wire rope. DISCUSSION. Mr. C. B. Albree, M. Eng. So. W. Pa.--Mr. Diescher tells us that "The intensity of this friction depends upon the pressure applied and the co-efficient of the materials in contact. The coefficient of a steel rope upon the cast iron finished surface, is 0.13. To be entirely safe, let us assume it to be 0.15. Now if I have not misconceived the...
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Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • United States
  • English
  • black & white illustrations
  • 1236898427
  • 9781236898425