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Elementary Machine Design

Elementary Machine Design


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About the Book

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. 1894. Excerpt: ... CHAPTER IV. PARALLEL OR STRAIGHT LINE MOTIONS. 37. Rectilinear motion in machines is usually obtained by means of prismatic guides. It is sometimes necessary, however, to accomplish the same result by linkages. A general method of design, which is applicable in many cases, will be given. In Fig. 32, d is the fixed link, and a is connected with it by a sliding pair, a, 6, c, and e are connected by turning pairs, as shown. The constrainment is not complete because B is free to move in any direction, and its motion would, therefore, depend upon the force producing it. It is required that the point B shall move in a straight line parallel to a. Suppose that B is caused to move along the required line; then any point of the link c, as A, will describe some curve, FAE. If a pin be attached to c, with its axis at A, and a curved slot fitting the pin, with its sides parallel to FAE, be attached to d, as in Fig. 33, it follows that B can only move in the required straight line. This is the mechanism of the Tabor Steam Engine Indicator. The curve described by A might approximate a circular arc whose centre could be located, say at 0, Fig. 33. Then the curved slot might be replaced by a link, attached to d and c by turning pairs at 0 and A. This gives B approximately the required motion. This is the mechanism of the Thompson Steam Engine Indicator. If, while the point B is caused to move in the required straight line, a point in b, as P, Fig. 32, were chosen, it would be found to describe a curve which would approximate a circular arc, whose centre, 0, and radius, --r, could be found. Let the link whose length = r be attached to d and b by turning pairs whose axes are at 0 and P, and the motion of B will be approximately the required motion. This is the mechanism of ..


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Product Details
  • ISBN-13: 9781459044012
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1459044010
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr

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