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 . ^ ?at -bs jad?sqi OOOS —-i ii PS« S «t-* 3 8 ?-3 *n S-^ S S — oD tjj g S a •nj -bs .lad?sqi 0O0> SS^SSSS ;:SSSSSS|;||||3|£||g|g 3^ bl £ c •nj -bs jad?sqi OOOOI °n! -bs jad ?sqi OOOi 4^nviAt-S9 9>^S>-in^lsS^^^OXA3$-; •ni bs aad?sqi 0009 SSBSSSS — — — — *iM«p3^if:tn«t-a6» — cj *nT bs aad?sqi OOOS 2SSS8S3eS5£gSgf.!iggSS3SffiSiJ •ni -bs jad•sqi OOOf- 3PS28S3S StS •pB»jqiJO r
Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . ^ ?at -bs jad?sqi OOOS —-i ii PS« S «t-* 3 8 ?-3 *n S-^ S S — oD tjj g S a •nj -bs .lad?sqi 0O0> SS^SSSS ;:SSSSSS|;||||3|£||g|g 3^ bl £ c •nj -bs jad?sqi OOOOI °n! -bs jad ?sqi OOOi 4^nviAt-S9 9>^S>-in^lsS^^^OXA3$-; •ni bs aad?sqi 0009 SSBSSSS — — — — *iM«p3^if:tn«t-a6» — cj *nT bs aad?sqi OOOS 2SSS8S3eS5£gSgf.!iggSS3SffiSiJ •ni -bs jad•sqi OOOf- 3PS28S3S StS •pB»jqiJO raoiioa •-spoaiioa 83Sg228 gS!8SS!S?iS<-rSgS Ji^S S38 SSSiSSig ? -M»- OTU:-e t-aa = 2=S2ri ssragss ?SiS8a5l:S3S2SSSS§ 83K 5S0SgS nwa dt!X 3fSSi;S!55^»rSX^Sg;^;X;| JO inoiioa -qom J9dspBajni saqoni•ja^araBia ift « :R a? i« s!^?tt°;5? :;?«» Ists* ? 360 MACHINE DESIGN 151 lations assume. From numerous experiments on the friction ofscrews and nuts, it has been found that tlie efficiency may be aslow as 10 per cent. Introducinir the efficiency in above equation,it may be written: Pp ___ 1 Assuming that 50 pounds is exerted by a workman in. p-1 i B i Fig. up the nut on a 1-inch bolt, the equation above showsthat P = 4,021 pounds; or the initial tension is somewhat lessthan the tabular safe load shown for a 1-inch bolt, with S assumedat 10,000 pounds per sq. inch. For shearing stresses the bolt should be fitted so that the bodyof the bolt, not the threads, resists the force tending to shear offthe bolt perpendicular to its axis. The internal strength of thebolt to resist shear is the allowable stress S times the area of the bolt in shear, or Stt(P If W represents the external force tending to shear the bolt the equality of the external force to the internalstrength is : WOTTf/ / . = —!-? (»Ol) Ml 150 MACHINE DESIGN Reference to the table on page 154 for the shearing strength ofbolts, raay be made to save the labor of c
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