Links, Mechanism, Machine, Machine Tools, Equipments and Instruments

Link: Part of a machine which moves relative to some other parts is known as link or element. Link may be rigid or flexible or it can be a fluid link.

Rigid Link:  Link or element which is capable of transmitting the motion with negligible deformation in it. In general we can say there is no link which is perfectly rigid. For example: crank, piston, cylinder, etc.

Flexible Link: this link is also capable of transmitting the power or motion with slight deformation in it. In practical machines we can say most of them links which are used are flexible links. For example,: spring, belt, etc.

Fluid Link: Fluid link is just of fluid element by which power or motion is transmitted from one element to another element.

The basic concept for transmitting motion with the help of fluid link will be the exerted pressure. With the help of the pressure the motion is transmitted from one point to another point. For example: hydraulic presses, hydraulic jacks, accumulators, etc. 

Mechanism: When one link is fixed in a kinematic chain then it becomes a mechanism.

Machine: A mechanism which is basically used to convert available energy into useful work is known as machine.

Each machine is a machine but all mechanisms are not machines.

Machine tools: A machine tool is a powered mechanical device, used to fabricate metal components or machines by machining. Examples are: broaching machine, drill press, gear shaper, lathe, screw machines, milling machine, shaper, saws, planer, grinding machines, etc. 

Equipment: The tools, machines, or the other things that we need for a particular job or activity. For example: safety equipments, electrical equipments, etc. 

Instrument: A tool or implement, esp. one used for delicate work (or mild task) or for scientific or artistic purposes. For example: scientific instrument such as microscopes, artistic instruments such as guitar, violin, etc.
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