Machine Design
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

p = D sin (120°/T)
p = D sin (360°/T)
p = D sin (90°/T)
p = D sin (180°/T)

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Machine Design
Spring stiffness is

Its capability of storing energy
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Its ability to absorb shocks

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Machine Design
In a hydrodynamic lubricated bearing

There is a thick film of lubricant between the journal and the bearing
There is a thin film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure

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