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Machines' Theory Back

Machine : It is an apparatus which is used for applying mechanical power. That has a number of interrelated parts, each having a definite function.

Kinematics of Machines : It deals with relative motion between the parts, neglecting the consideration of the force.

Kinematic Link : It is a resistant body or assembly of resistant bodies which constitutes the part of a mechanism. It is the smallest element of the machine which transmits motion or other links. A resistant body does not change its physical form by the application of forces.

Link : Every part of a machine having motion which is relative to some other part.

Lower Pair : A pair is called lower pair when two links have surface or area contact between them while in motion. The relative motion in a lower pair is either purely turning or sliding.

Higher Pair : A pair is called higher pair when two links have point or line contact between them while in motion. The relative motion in higher pair is a combination of sliding and turning.

Kinematic Pair : A pair is called kinematic pair when two kinematic links are joined in such a way that the relative motion between them is completely or successfully constrained.
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