Benjamin, Charles Henry, 1856- [from old catalog], Hoffman, James David, 1868- [from old catalog] joint author · New York, H. Holt and company · leaf 306
lustration. Find the weight of the fly-wheel also from some acceptableformula based upon the fluctuation of speed, using for the allow-able fluctuation 20 to 25 per cent, and check with the above. Arm.—The fly-wheel arm may be calculated as follows:estimate the time required in punching one hole,… … Fig. 138. four seconds. Assuming the velocity of the punch duringaction to be the same as that of the cam center we have 3.1416X 1.5-T-4 = 1.1781 in. per second. The time occupied in punchingis I ^ 1.1781 = .318 second. The velocity of the rim of the wheelis 1413.7 ft. per minute = 23.56 ft. per…
Machine design
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