. American engineer and railroad journal . s P- d= (2) d equals D / (3) P equals- d= fD= Under repeated alternate strains allow the compressive stressesgiven in Table V, (From Pencoyd experiments,) TABLE V. 1 41 r d 20 13,360 30 9,540 40 8,380 .50 7,760 60 7,120 Steel(70,000 lbs.) 70 6,520 80 90 TOO 4,680 no 4,220 inch. CROSSHEADS. The formulae for cast-steel crosshead hubs used in connectionwith the above piston rods are shown in diagram Fig. 4, The allowable working fiber stresses arc as follows • Rod at key-way 12,500 pounds per square d , „ , „ Key = —r- bearing value 40,000 Ke
. American engineer and railroad journal . s P- d= (2) d equals D / (3) P equals- d= fD= Under repeated alternate strains allow the compressive stressesgiven in Table V, (From Pencoyd experiments,) TABLE V. 1 41 r d 20 13,360 30 9,540 40 8,380 .50 7,760 60 7,120 Steel(70,000 lbs.) 70 6,520 80 90 TOO 4,680 no 4,220 inch. CROSSHEADS. The formulae for cast-steel crosshead hubs used in connectionwith the above piston rods are shown in diagram Fig. 4, The allowable working fiber stresses arc as follows • Rod at key-way 12,500 pounds per square d , „ , „ Key = —r- bearing value 40,000 Key = l,4d shear Hub diameter = i,6d 28,000 X = ,6d shear hub 12,000 Y = ,5d shear rod 9,400 The following GROUP III, PISTON RODS. formulae for piston rods are expressed in August, 19H. AMERICAN ENGINEER AND RAILROAD JOURNAL. 327 terms of tlic diameter of rod at root of thread on piston end. Let P = area of piston X boiler pressure. A = area of piston rod at root of thread d ~ minimum diameter of piston rod at root of TABLE nDiMEIiSIOnS POK PISTON EHB OF PISTON HOD. /? B c D E F G N J K L />7 IV p W s 2| 3i 3 2| *i 3| 4 7^ 5| 3j 3j f 2 -1 s 3 3i 34 ^^ *i 3i 3j 2| 5| -♦i fi ? -i 2 ^i 6 3i 3| 3i 3 5? K ^i ^1 ^1 r^ ^j f 2 *i d 3i 4 3| 3i ^i ^f ^i 2J 1 5~ 4 ■■ i 2i « 6 3f 4 3| 3i *i rl ■z *i i »5 5 ^i ■ 2 2| 6 6 n -»£ 4 35 ^F Ji *r 4 8a 1 ^i ?■ zi 4 6 A ^i 4 i ijf *i ^fl- ^l 8i 5| ^f 2 2f ^1 6b 4 4 *i H 7 6 4 ^l 6l ^5 ^1 5 25 6^ *i 4 4 4 t i ^1 3| 5s «s 6 2 3 ri 6 i s 1 ■>i 7 6 ^1 3| 9^ 65 !l ? 3 1 6 S — working fiber stress equals io,ooo pounds per (i) A _ p — ^^_^ (2) d = /_A_ V .7854 Width of key to be less than d X I-275-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
