Pole: this is the centre of finite rotation of the coupler.Relative Pole: this is the pole of coupler associated to other moving link.Accuracy Points: The points at which generated functions and desired function meet.Structural Error: The difference among generated and desired functions is called structural error.
Chebyshev’s Spacing of: It is a technique of finding accuracy points.Freudenstein’s Equation: this is an equation for a dimensional synthesis of a mechanism.