Technical Mechanics Volume 2

Technical Mechanics Volume 2

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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. 1903 edition. Excerpt: ...to m' ' must be equivalent to the resultant of the centrifugal forces due to the bodies to be replaced (m and m'). Thus, draw AD to represent the centrifugal force of m'; then CD represents the centrifugal force of m' ', and this replacing body should be placed in the direction CD from O at such a distance r" that Thus, balance has been effected by two bodies whose centres of rotation are arbitrarily situated along the axis and whose masses (m' and m") or distances from the axis (r' and r") may also be arbitrarily selected. ' EXAMPLES. 1. Let ml and m, equal 20 and 12 lbs., r, and r, equal 6 and 9 in., and O, O, equal 15 in., and suppose that ml and m, are in the same plane with the axis and on the same side of it. Show how the two bodies might be balanced. 2. If the two bodies of ex. 1 are on opposite sides of the axis, show how they might be balanced. 3. Let m, m, and m, equal 20, 12, and 18 lbs., r, r, and r, equal 6, 9, and 12 in., O1O, and O, O, equal 16 and 18 in. respectively, and suppose that the successive angles between O, m, Ozmz, and Osm3 equal 90. Show how to balance the three bodies with additional ones rotating about O, and O, . 278. Pivot and Journal Friction.--Flat Pivot.--Let fig. 2 15(a) represent the flat end of a shaft which is pressed or "thrust" against a flat bearing and rotates. Let r denote the radius of the end, N the thrust or normal pressure, and f the coefficient of friction for the rubbing surfaces. Regarding the normal pressure as uniform, its value per unit area is N /arr', and the normal pressure on any elementary area as that indicated in fig. 215(a) is (N /1zr')pd0dp while the friction on that area is f times that...show more

Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236950518
  • 9781236950512