Theory of Machine
In higher pair, the relative motion is

Purely sliding
Purely rotary
Combination of sliding and turning
Purely turning

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Theory of Machine
Pitch point on a cam is

Any point on pitch circle
Any point on pitch curve
The point on cam pitch curve having the maximum pressure angle
The point on cam pitch curve having the minimum pressure angle

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Theory of Machine
Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is

l₁ + l₂ + l₃
l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³
l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴
(l₁ + l₂ + l₃)/3

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