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. 1906 Excerpt: ...d=the diameter of journal in inches. N= number of revolutions per minute. v=velocity of rubbing in feet per minute. F= friction at surface of journal in lbs. = W tan i/' nearly, whose is the angle of repose for the two materials. If a journal is properly fitted in its bearing and does not bind, the value of F will not ...
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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. 1906 Excerpt: ...d=the diameter of journal in inches. N= number of revolutions per minute. v=velocity of rubbing in feet per minute. F= friction at surface of journal in lbs. = W tan i/' nearly, whose is the angle of repose for the two materials. If a journal is properly fitted in its bearing and does not bind, the value of F will not exceed W tan $ and may be slightly less. The value of tan varies according to the materials used and the kind of lubrication, from.05 to.01 or even less. See experiments described in Art. 48. The work absorbed in friction may be thus expressed: Fv= Wtan x"dN=dNWtar-l, u lu per min (W) 46. Limits of Pressure. Too great an intensity of pressure between the surface of a journal and its bearing will force out the lubricant and cause heating and possibly "seizing." The safe limit of pressure depends on the kind of lubricant, the manner of its application and upon whether the pressure is continuous or intermittent. The projected area of a journal, or the product of its length by its diameter, is used as a divisor. The journals of railway cars offer a good example of continuous pressure and severe service. A limit of 300 pounds per square inch of projected area has been generally adopted in such cases. In the crank and wrist pins of engines, the reversal of pressure diminishes the chances of the lubricant being squeezed out, and a pressure of 500 lbs. per sq. in. is generally allowed. The use of heavy oils or of an oil bath, and the employment of harder materials for the journal and its bearing allow of even greater pressures. Professor Barr's investigations of steam engine proportions show that the pressure per square inch on the cross-head pin varies from ten to twenty times that on the piston, while the intensity of pressure on ...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.