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Write down different relations used in belt drive.

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 D1 = Diameter of the driver 

N1 = Speed of the driver in R.P.M. 

D2 = Diameter of the driven or Follower 

N2 = Speed of the driven or follower in R.P.M. 

R1 = Radius of the driver 

R2 = Radius of the driven or Follower 

t = Belt thickness (if given) 

X = Distance between the centers of two pulleys 

α = Angle of lap (Generally less than 10º) 

θ = Angle of contact (Generally greater than 150º) (always express in radian.) 

µ = Coefficient of friction s = Total slip in percentage(%) L 

= Total length of belt Formula For Open Belt Drive

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