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Practical Essays on Mill Work and Other Machinery Volume 1

Practical Essays on Mill Work and Other Machinery Volume 1


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAP II. CLASS II. Of Couplings having one Bearing. SECTI0N I. 232. This class of couplings when properly constructed, has, to a certain degree, the property of being flexible in all directions, like the well known contrivance invented by Dr. Hook (Fig. 11.) called the universal joint. This joint is sometimes constructed by a cross, as represented in the figure, and sometimes with its four pivots fastened at right angles upon the circumference of a hoop, or on the surface of a solid ball. The moving parts are evidently alike in all these cases. 233. It is sometimes applied to communicate motion, instead of beveled gear, when the angle does not exceed 30 or 40degrees, and where the number ofrevolu- tions is to be continued the same; also where equality of motion is not required, for as it recedes from a right line, its motion becomes irregular. The property of the universal joint to which I allude, of conveying angular motion, is of great use when it can be attained in couplings, in order to allow for the inaccuracy which arises from the settling of the framing or the wearing of the brasses. It need not, however, yield further than what is really necessary for that purpose, which is so little, that no irregularity of motion that can be hurtful in practice can arise. 234. The disadvantage of the universal joint, as represented by Fig. 10, and as commonly made, is, that it has not sufficient strength to resist great strains. I shall, however, afterwards describe a modification of it, well adapted to bear very considerable stress, (see Fig. 18. Art. 247-) 235. Most part of the couplings de- scribed in Chap. I. may with some small addition or alteration, be converted into couplings having one bearing, of this description is the square coupling. COUPLING IX. T...


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Product Details
  • ISBN-13: 9780217034869
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217034861
  • Publisher Date: 26 Jun 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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