This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ... W is the load and R the mean radius of the coils, the torque on the wire will be WR. The length of the wire is 1rR. Hence, from (2), 32"/R2 6 = Gd' s where d is the diameter of the wire. The extension of this portion of the spring due to 0 is OR, therefore the extension for n coils will be FIG. 101. ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ... W is the load and R the mean radius of the coils, the torque on the wire will be WR. The length of the wire is 1rR. Hence, from (2), 32"/R2 6 = Gd' s where d is the diameter of the wire. The extension of this portion of the spring due to 0 is OR, therefore the extension for n coils will be FIG. 101. The formulae also apply to springs in compression, but must not be used for springs made of wire not circular in cross-section. See Duncan's Applied Mechanics for Engineers (Macmillan). Helical springs are also called cylindrical or cylindrical spiral springs. It should be noted carefully that none of the formulae given in this cha ter for the strength and rigidity of shafts and springs should e employed for cases in which the elastic limit is exceeded. Ex. 1. Find the diameter of a cylindrical solid shaft to transmit 100 horse-power, revolutions 50 per minute, the angle of torsion is limited to 1 per 10ft. length. G=107 lb. per sq. in. B.E. 1 Ex. 2. A solid cylindrical steel shaft, 4 in. diameter, revolutions 200 per minute, transmits 150 horse-power. What will be its angle of twist in degrees in a length of 40 ft? Modulus of rigidity, 11-5 10' lb. per sq. in. Ex. 3. A solid steel shaft, 3 in. diameter, when transmitting power, is observed to twist through 17% degrees on a length of 40ft. The modulus of rigidity of the steel is 5500 tons per square inch. What is the-twisting moment in inch-tons? What horse-power is the shaft transmitting it is revolving at 90 rev. per mini B.E. Ex. 4. A shaft running at 150 rev. per min. has to transmit 120 horse-power. The shaft must not be subjected to a greater stress than 5500 lb. per sq. in., and must not twist more than 1 degree in 10 ft. Determine the minimum diameter....
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