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Notes on Lectures in Machine Design

Notes on Lectures in Machine Design


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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. 1891 Excerpt: ...area of the bearing surface varies in thrust bearings with several conditions, as it does in journals subjected to pressure at right angles to the axis. Thus in the pivots of turn-tables, swing bridges, cranes, and the like, the movement is slow and never continuous, often being reversed, and also the conditions are such that ' bath lubrication ' may be used, and the allowable unit pressure is very high; equal often to 1500 pounds per square inch, and in some cases greatly exceeding that value. The following table may be used as an approximate guide in the designing of thrust bearings. The material of the thrust journal is wrought iron or steel, and of the bearing is of bronze or brass (babbitt metal is seldom used for this purpose). Bath lubrication is used, i. e., the running surfaces are submerged constantly in a bath of oil. Allowable unit pressure. Ibs. per Mean velocity of rubbing square inch of projected area surface. Ft permin. of the rubbing surface. Up to 50 IOOO 50 to IOO 600 100 to 150 350 150 to 200 IOO Above 200 50 If the journal is of cast iron and runs on bronze or brass, the values of allowable pressure given should be divided by 2. Examples to illustrate the design of thrust journals. 1st. It is required to design a thrust journal whose outline is a "tractrix," and which is required to support a vertical shaft which, with its attached parts, weighs 2,000 lbs., and runs at a rotative speed of 200 revolutions per minute. The dimensions of the thrust journal are as yet unknown and therefore the velocity of rubbing surface must be estimated. Suppose that the mean diameter'of the journal is 2," then the mean velocity of rubbing surface will be 2 X Tt X N-h 12 = 103 teet per minute. This is so near the limit in the table between a...


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Product Details
  • ISBN-13: 9781235948916
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1235948919
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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