The Practical Model Calculator for the Engineer Mechanic Machinist Manufactu
The Practical Model Calculator for the Engineer Mechanic Machinist Manufactu
Byrne, Oliver
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The dimensions may be determined from the formula/ b d 2 = 6 W I. To apply the formula to cranks, we may assume the depth at the shaft to be equal to n times the diameter of the shaft ; hence, if m X D be the diameter of the shaft, the depth of the crank will be n X m x D. Substituting this in the formula fb d 2 6 W ?, and it becomes fb X n 2 X m 2 X D 2 = 6 W I. Now, as before, W = -7854 X P x D 2, so that the formula becomes / x b X ri z x m 2 = 4-7124 X P x I. The value of n is arbitrary. In... practice it may be made equal to 1J or 1-5. Taking this value, then, for 250 THE PRACTICAL MODEL CALCULATOR. cast iron, the formula becomes 15300 x b x f X w 2 = 4-7124 x P X I, or 7305 m 2 b = P I ; but if L denote the length of the crank in feet, the formula becomes 609 m z b = PL, and . *. B = P x L -T- 609 m 2 . This formula may be put into the form of a rule, thus : RULE. To find the breadth at the shaft when the depth is equal to 1J times the diameter of the shaft. Divide the square of the diameter of the shaft in inches by the square of the diameter of the cylinder ; multiply the quotient by 609, and reserve the pro- duct for a divisor ; multiply the greatest elastic force of the steam in Ibs.
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