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Machine-Shop Mathematics

Machine-Shop Mathematics


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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. 1922 edition. Excerpt: ...takes place when the crank is turned, the index plate moving either in the same direction as the crank or in the opposite direction. Therefore, in using differential indexing to obtain a given number of divisions we have to find two factors, (1) the indexing fraction and (2) the change gears which will turn the index plate the required amount in the proper direction during the movements of the index crank. Change Gears. The change gears furnished with a B. & S. dividing head for differential indexing and spiral milling have the following numbers of teeth: 24 24 28 32 40 44 48 56 64 72 86 100 In solving the exercises on differential indexing use only these gears. Illustration of Differential Indexing. For example, let us consider the differential indexing on a B. & S. dividing head for 59 divisions. In simple indexing for 60 divisions the movement of the index crank is $, or J, of a turn for each cut. If the crank is given of a turn 59 times, it makes 39 turns, or of a turn less than the 40 turns required for one revolution of the work. Hence the index plate must move in the same direction as the crank of a revolution while the work revolves once. MECHANISM OF DIVIDING HEAD GEARED FOR DIFFERENTIAL INDEXING A, spindle; B, index plate; C, worm wheel; D, worm; E, shaft; H, index pin; P, stop pin; if, gear on spindle (driving); S, gear on bevel-gear shaft, or worm, (driven); T, intermediate gear; U, first gear on stud (driving); V, second gear on stud (driven) A 32-T gear (driving) is placed on the special differential-indexing center in the spindle of the dividing head, and a 48-T gear (driven) is placed on the bevel-gear shaft which turns the index plate. An intermediate gear is used to make the index plate move in the same direction...


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Product Details
  • ISBN-13: 9781152396555
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1152396552
  • Publisher Date: 12 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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