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(i) Coefficient of fluctuation of speed: Coefficient of fluctuation of speed is defined as the ratio of the maximum fluctuation of speed to the mean speed. It is denoted by C s.
C s = (N 1 – N 2 ) /N
Where, N 1 = maximum speed in rpm;
N 2 =minimum speed in rpm; N = mean speed in rpm
Classification of drives:
(i) Belt drives.
(ii) Chain drives.
(iv) Gear drives.
(i) Pressure angle: It is the angle between the direction of the follower motion and a normal to the pitch curve. This angle is very important in designing a cam profile. If the pressure angel is too large, a reciprocating follower will jam in its bearing.
(ii) Pitch point: It is point on pitch curve having the maximum pressure angle.
Types of constrained motion:
(i)Completely constrained motion.
(ii)Incompletely constrained motion.
(iii)Successfully constrained motion.