Relative Proportions of the Steam-Engine
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. 1879 edition. Excerpt: ... = 630 degrees Fahr..000006689x5 B More accurately, 4.98 should have been used in the place of 5 inches. Knowing that at a temperature of 977 degrees Fahr. iron is just visibly red, we may use the following formula to determine the difference in the diameters of the eye of the crank and of the inserted part of the crank-pin: Let dc--diameter of inserted part of pin, "d, -required diameter of eye; we have, with sufficient approximation, de-d and d..994024-(101) 1.0060201 V Should this formula give a greater difference than is necessary in practice, reduce it according to judgment by using less heat, unless a particularly strong grip of the eye upon the pin is desired. A high heat is apt to warp a forging, and no more should be used than is necessary. This formula cannot be regarded as accurate, and should be used as a guide only; it applies with sufficient approximation to machinery steel. If the entering part of the crank-pin be made very slightly taper and larger than the eye of the crank, and the pin be forced in by strong hydraulic pressure, we avoid the risk of warping occasioned by heat, and secure almost as good a result so far as strength of grip is concerned. Crank-pins are sometimes fastened by a key " cutter" at the back, and sometimes held by a nut. Special care must be taken to have a sufficient thickness of metal around the eye to hold the pin firmly. In practice the thickness of the ring around the eye is usually taken equal to one-half the diameter of the eye. The depth of the eye is usually from 1 to 2 times its diameter, thus giving a cross-section of ring around the eye of from lfo to 2 greater area than that of the inserted part of the crank-pin at right angles to its axis. In some cases the pin, crank and...
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