Babendreier, Arthur O. [from old catalog], Maryland institute for the promotion of mechanic arts and design, Baltimore. [from old catalog] · Baltimore, Md., The Maryland institute for the promotion of mechanic arts and design · leaf 28
rkPower in ft.-lbs. (P) = weight (W) X distance infeet (D) neglecting friction. Now, as a wrench or lever L (Fig.12c) is necessary to turn either thescrew or its engaging nut, the lengthof such wrench or lever in feet mul-tiplied X 2 X 3.1416 would givethe distance the lever arm hasmoved to do the… … Pl =Pl = ZX2X3.1416200 or 12.5664 = 16 lbs. about But on account of the friction between the threads thepower (Pl) would have to be increased. Also the frictioneither at the end of the screw or the bottom surface ofthe nut would have to be considered, depending uponwhich one is turned. For purposes…
Mechanics
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