In the study of THEORY OF MACHINE we need to understand some important definitions, and these are-
1] Link- Each part of a machine which moves relative to the other is called a link. It is also defined as, a resistance body or a group of resistance bodies with rigid connection preventing their relative movement is known as a link. A slider crank mechanism consists of four links: frame and guides, crank, connecting rod and slider.
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2] Pair- A pair is joint of two links having relative motion between them. If the relative motion between them is completely or successfully constrained i.e. in a definite direction, the pair is known as kinematic pair.
For example; In a slider crank mechanism the link 2 rotate relative to the link 1 and constitute a turning pair. Similarly, links 2,3 and 3,4 constitute turning pairs. Link 4 [slider] reciprocates relative to the link 1 and is a sliding pair.
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3] Mechanism- A combination of number of bodies[links] assembled in such a way that the motion of one causes constrained and predictable motion to the other is known as mechanism. and the function of a mechanism is to transmit and modify a motion.
A slider crank mechanism {Fig. 1.1} converts the reciprocating motion of a slider into rotary motion of the crank or vice-versa. Some other examples of mechanisms are typewriters, clocks, spring toys etc.
4] Machine- A machine is a mechanism or a number of mechanism combined together which apart from imparting definite motions to the parts, also transmits and modifies the available mechanical energy into some kind of desired work. It is neither a source of energy nor a producer of work but helps in proper utilization of the same. The motive power has to be derived from external sources.
2] Pair- A pair is joint of two links having relative motion between them. If the relative motion between them is completely or successfully constrained i.e. in a definite direction, the pair is known as kinematic pair.
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| Fig. 1.1 |
For example; In a slider crank mechanism the link 2 rotate relative to the link 1 and constitute a turning pair. Similarly, links 2,3 and 3,4 constitute turning pairs. Link 4 [slider] reciprocates relative to the link 1 and is a sliding pair.
Click here for more information about pairs
3] Mechanism- A combination of number of bodies[links] assembled in such a way that the motion of one causes constrained and predictable motion to the other is known as mechanism. and the function of a mechanism is to transmit and modify a motion.
A slider crank mechanism {Fig. 1.1} converts the reciprocating motion of a slider into rotary motion of the crank or vice-versa. Some other examples of mechanisms are typewriters, clocks, spring toys etc.
4] Machine- A machine is a mechanism or a number of mechanism combined together which apart from imparting definite motions to the parts, also transmits and modifies the available mechanical energy into some kind of desired work. It is neither a source of energy nor a producer of work but helps in proper utilization of the same. The motive power has to be derived from external sources.
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