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# Tom[unit 1]

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Theory of Machine - Unit1

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### Tom[unit 1]

1. 1. THEORY OF MACHINES By-ranjeetnitj@gmail.com Unit 1 Mechanism:-If a no. of bodies assembled in such a way that the motion of one causes constrained & predictable motion to the others, it is known as mechanism. Eg. Slider Crank Mechanism Figure a illustrates a cross section of a machine—an internal combustion engine. The assembly of the piston, connecting rod, and crankshaft is a mechanism, termed a slider-crank mechanism. The basic schematic drawing of that mechanism, Fig. b, called a skeleton outline, shows only its fundamental structure without the technical details explaining how it is constructed. Machine := A machine is a mechanism or a combination of mechanism which apart from imparting motion to the part , also transmit & modifies the available mechanical energy into some kind of desired work. f For More like us on FB - https://www.facebook.com/IesiasgateQuestionsForMechanicalEngineering Page 1
2. 2. THEORY OF MACHINES By-ranjeetnitj@gmail.com Note :There is a difference between a machine and a mechanism: All machines transform energy to do work, but only some mechanisms are capable of performing work. The term machinery means an assembly that includes both machines and mechanisms, means a machine would be always mechanism(s) but for a mechanism it is not always true, that it would be a machine. Resistant & Rigid Body:Rigid Bodies: - if a body does not suffer any distortion under the action of force or the distance between any two points on it remains constant on applying force or with time, then it would be a Rigid Body. Even though such an object cannot physically exist Resistant Bodies: - A body which only behave as Rigid in some circumstances or bodies which are rigid for the purpose they have to serve for. E.g. Belt Drive, where belt is rigid when subjected to a tensile force. Link:- A link is defined as a Rigid/Resistant body is having two or more pairing elements which connect it to other bodies for the purpose of transmitting force or motion. Means to say a Rigid/Resistant body only would not be a link until it is not attached to another body by a joint. OR A Resistant Body or a group of resistant bodies with rigid connections preventing their relative movement is known as link. A Link may be consisting of one or more resistant bodies. f For More like us on FB - https://www.facebook.com/IesiasgateQuestionsForMechanicalEngineering Page 2