Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . ,(H)() foot-pounds per minute. Hence,to lind tlie borse-])ower that a shaft will transmit, we must firstiiiid the work done, and then relate it to the speed. Take, for ex-ample, the case of a pulley, the symbols being the same as before namely, P ^^ driving force at rim of pulley (lbs.); Tl — radiuB of ])ulleY (inches); N = nuniber of revolutions per minute; andH =; liorse-power.
Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . ,(H)() foot-pounds per minute. Hence,to lind tlie borse-])ower that a shaft will transmit, we must firstiiiid the work done, and then relate it to the speed. Take, for ex-ample, the case of a pulley, the symbols being the same as before namely, P ^^ driving force at rim of pulley (lbs.); Tl — radiuB of ])ulleY (inches); N = nuniber of revolutions per minute; andH =; liorse-power. Then, Work := force distance ^ P X f27rRN) N ;{;{,()(iO X 12;(54). This is one of the most useful eipiations for calculations involvinghorse-power. By it the number of inch-pounds torsion for anyhorse-power can be at once ascertained. It should be clearly noted, however, that in this e(|uation thebendintr moment does not enter at all. Hence any shaft based in size on home-jxiwer alone^ is based on furxionril nuiment alone, ibending ujoment being entirely neglected. In many cases the ibending moment is the controlling one as to limiting fiber empirical shafting formulge depending upon the horse-])ower relation are unsafe, unless it is definitely known just whattorsional and bending moments have been assumed. The only safe way to figure the size of a shaft is to iind |accurately what torsional moment and bending moment it has tosustain, and then combine them according to equation 11 or 42 MACHINE DESIGN 111 iutroJucing the element of speed as basis for assumption of a highor low workiiiit tiher stress. PRACTICAL MODIFICATION. The practical
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