GRAKKED MUPT* 

 engine the throw of the crank u equal to the stroke of the 



Him 47: Wrottfkt-iron OvrAwif Ore**. -Draw the 

 two elevations shown in fig. 47, also a plan. Scale 1J inches to a 



ft) t 



Crmmkt 



D= diameter of *h*ft 

 Unyth of large bo = 1 



I' ' 



Length of *mall bo= II d. 



!- . 



Wldlh of crank arm at centra of abaft I -8 D. 



cnuik.ptn- I-64. 

 The thkkneM of the crank am naj be roughly taken a=-7D. 



48. Dengn a wrought-iron crank tor an 

 having a stroke of 4 feet. The erank-ahaft U 9 inehee in diameter. 

 and the crank- pin ta 4f inehee in diameter and <ty inehee long. 



Cranktd Axle. A* an example of a cranked 

 lie cranked axle for a locomotive with inside 

 \IIM.I.TX S}I..\MI in fig. 48 ; here the crank and shaft or axle 

 ne piece. A is the wheel seat, B the journal, C 

 the crank pin. ami i he crank arms. Only one half of 



the axle U shown in fig. 48, but the other half is . 

 same. The cranks wo halvee arc, however, at 



angles to one another. The ends of the crank arm* are 

 ! n he, the crank pin ends lieing turned at the 



