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Velocity Ratio for Open Belt Drive:
Figure
Consider a simple belt drive (that is one driver and one follower) as shown in the figure given below
Let
D1 = Diameter of driver
N1 = Speed of driver in R.P.M.
D2, N2 = Corresponding values for follower
Length of belt which passes over driver, in 1 minute = P.D1.N1
Likewise,
Length of belt,
That passes over follower, in one minute = P.D2.N2
As the length of belt, which passes over the driver in one minute is equal to length of belt which passes over the follower in one minute, therefore:
P.D1.N1 = P.D2.N2
Or, velocity ratio = N2/N1 = D1/D2
If the thickness of belt 't' is given to us then
V.R = N2/N1 = (D1 + t)/(D2 + t)
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