POWER TRANSMISSION ELEMENTS AND MECHANISMS 177 



SHORT -CENTER BELT DRIVES 



A in Inches 



A III I I I I I I I 



X 



X 



X 



O'l 5 



20 



I I I I I r 



I I I 



a 



I I 



20' 



10 9 8 7 6 5 4 



Procedure:- 



Connec+ I on A-scale with 12 on B-scale 

 follow the ray on C-scale to Y-scale and connect 

 to value of A on X"Sccile giving A = 4.5deq. 

 Connect point on Y-scale with (CI+D2) 

 on Z-scale giving (^+A) = 33deg. 



y 



/ 



y 



0.15 



y 



y 



y 



y 



y 



^T- 



| NII | IIIIIIII I I I I I I \y\ I I 



30 20 10 y 2 



Angle AyAxx Degrees 



Example:-d = 5in., D2= 8 in.^ 

 A = (-lln.')or less than tin., 

 B= 12 in., C= 50 in., and 

 D=30in. 



0.4 10 \ 



20 



04 



I 

 \ 



loi 



Va^+b^ 



\ 30 

 \ 

 \ 



\^ Angle f^+.4) in Degrees 



I |illlllTtl|IIIIIMII|lllll II I I I I I I 1: 



50 40 30N, 



20 



10 



20 



30 



B iiiii 1 1 1 1 1 I I I I I I I I I I I I I I I \r 



ni o • i__i ^ 



40 



55 



I I I 



04 



B in Inches 



60 50 



40 



(d + D2)in Inches 

 30 20 



^1 N I I I I I I I III I II I I I I I I I I I I I I I I I I \ I I 



