Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Ensure proper alignment
Reduce vibration
Ensure uniform loading
Reduce slip

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Theory of Machine
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is

(2/3). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]
(1/2). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]
(2/3). μ W cosecα (r₁ + r₂)
(1/2). μ W cosecα (r₁ + r₂)

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