Quick return mechanisms are used in machine tools such as shapers and power driven saws for the purpose of giving the reciprocating cutting tool a slow cutting stroke and a quick return stroke with a constant angular velocity of the driving crank. Whitworth quick return motion mechanism–Inversion of slider crank mechanism. This mechanism is mostly…
Slider crank chain: This is a kinematic chain having four links. It has one sliding pairand three turning pairs. Link 2 has rotary motion and is called crank. Link 3 has got combined rotary and reciprocating motion and is called connecting rod. Link 4 has reciprocating motion and is called slider. Link 1 is frame (fixed)….
The link connecting the driving crank with the follower crank in a four bar linkage is called the coupler. Similarly, in the case of a single slider crank mechanism the connecting rod is the coupler. During the motion of the mechanism any point attached to the coupler generates some path with respect to the fixed…
A mechanism is one in which one of the links of a kinematic chain is fixed. Different mechanisms can be obtained by fixing different links of the same kinematic chain. These are called as inversions of the mechanism. Inversions of Four Bar Chain One of the most useful and most common mechanisms is the four-bar…
When one of the links of a kinematic chain is fixed, the chain is known as mechanism. A mechanism with four links is known as simple mechanism, and the mechanism with more than four links is known as compound mechanism. When a mechanism is required to transmit power or to do some particular type of work, it then…
The two links or elements of a machine, when in contact with each other, are said to form a pair. If the relative motion between them is completely or successfully constrained (i.e. in a definite direction), the pair is known as kinematic pair. Classification of kinematic pair The kinematic pairs may be classified according to the…
Mechanism Machine Structure 1. There is relative Relative motion exists There is no relative motion between the parts between parts of a motion between the of a mechanism machine. members of a structure. It …
The following differences between a machine and a structure are important from the subject point of view: Structure1. the member of structure do not move relative to one other.2. Structure Do not transform energy in to the useful work.3. the member of structure transmit forces only.4. it dose not have mechanism.5. E,g: Railway Bridge, truss,…
A machine part or a component of a mechanism is called a kinematic link or simply a link. A link is assumed to be completely rigid, or under the action of forces it does not suffer any deformation, signifying that the distance between any two points on it remains constant. Although all real machine parts…
Mechanics: It is that branch of scientific analysis which deals with motion, time andforce. Kinematics is the study of motion, without considering the forces which produce thatmotion. Kinematics of machines deals with the study of the relative motion of machine parts. It involves the study of position, displacement, velocity and acceleration of machine parts. Dynamics of machines involves…