POWER TRANSMISSION ELEMENTS AND MECHANISMS 171 



FLAT-BELT SPEED -HORSEPOWER CHARTS 



The fransmission copac/iy of a be/f or chain drive is ca/cula'iecl 

 from ihe relaiionship 



Nei i-urning force in lb. x speed in fi per min 



Horsepower 'V, ,, ■ — ; 



Ft Id. per mm per hp. 



_(T|-T2)V_(T|-T2)TrclN 



33,000 



33,000 



^ ( T| - T2I = The iension on Ihe lighl side minus Ihe lension 

 ys °" ^'he loose side of a chain or bell. If is Ihe 



^ J effeclive pull. 



■^ ' V= The bell or chain velocily in ff per min. and is 

 V equal lo Ihe producf ofrr limes D, Ihe diameler 

 ,^ "-^ of Ihe pulley in feel, limes N^ lis r p.m. 



\° °-^ for a given flaf belf Ihe values of(^^-Tq\ 



c^^ per inch of widlh is usually known. For 



^ V lype belfs il is given per bell In chain 



^ fransmission, T^ is usually zero, hence 



"5 CTj-T^) is Ihe a/lowable working load 



■ chain as in roller chains or per 



■ nominal widlh, as m silenf 



line indicafes Ihalfor 

 N= 600 and TfT2=60, 

 5. 7 per in. widlh of belf 



Belt Speed in Fee+ per Minute 



