Useful Rules and Tables; Relating to Mensuration, Engineering, Structures, and Machines

Useful Rules and Tables; Relating to Mensuration, Engineering, Structures, and Machines

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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. 1883 edition. Excerpt: ...or equal to the difference of those obliquities if one screw is right-handed and the other left-handed. N.B.--The angular velocities of two gearing screws are inversely as their numbers of threads. 5. Pulley and Sand (whether belts, cords, or chains).--Rule XVI.--To find the ratio of the speed of turning of two pulleys connected by a band. Measure the effective radii of the pulleys from the axis of each to the centre line of the baud; then the speeds of turning will be inversely as the radii. Rule XVII.--To design a pair of tapering speed-cones, so that the belt may fit equally tight in all positions. Case I.--Belt crossed (fig. 98). Use a pair of equal and similar cones tapering opposite ways. Case II.--Belt uncrossed (fig. 99.) Use a pair of equal and similar conoids tapering opposite ways, and bulging in the middle according to the following formula: --Let c denote the distance between the axes of the conoids; rv the radius at the larger end of each; r2, the radius at the smaller end; then the radius in the middle, rR, is found as follows: --6. Xiinkwork.--"When two pins are connected together by a link or connecting-rod, to find their velocity-ratio at any instant, use Rule X. of the preceding Section (see page 230), taking the centres of the pins as a pair of rigidly-connected points. When the points thus connected move in one plane, use Rule VIII. of the preceding Section to find the instantaneous axis of the link; the velocities of the connected points will be proportional to their perpendicular distances from that axis. Should the triangle formed by the connected points and their instantaneous centre be inconveniently large, proceed as follows: --Rule XVIII.--Draw any triangle having one side parallel to the line of connection more

Product details

  • Paperback | 112 pages
  • 189 x 246 x 6mm | 213g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236640160
  • 9781236640161