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Moment of Force

Definition: It is the Turning effect produced by a force, on the body, on which it acts. The moment of force is equal to the product of force and the perpendicular distance of the point about which the moment is required and the line of action of the force. Mathematically: Moment of force=F x L Read More »

Mass Moment of Inertia

Definition: It has been established since long that a rigid body is composed of small particles. if the mass of every particle of a body is multiplied by the square of its perpendicular distance from a fixed live, then the sum of these quantities (for the whole body) is known as mass moment of inertia of the body. it is ... Read More »


Definition: It may be defined as the product of force and the perpendicular distance of its line of action from the given point or axis. A little consideration will show that the torque is equivalent to a couple acting upon a body. Read More »

Kinematic Link or Element

Definition: Each part of a machine, which moves relative to some other part is known as a kinematic link ( or simply link ) or element. A link may consists several parts, which are rigidly fastened together, so that they don’t move relative to on an other. Types of Links 1. Rigid Links 2. Flexible Links 3. Fluid Links for ... Read More »

Types of Links

In order to transmit motion, the driver and the follower may be connected by the following three types of links. 1. Rigid Link: A rigid link is one which does not undergo any deformation while transmitting motion, strictly speaking rigid links do not exists. However, as the deformation of a connecting rod, crank etc of a reciprocating steam engine is ... Read More »

What is Structure? (Definition)

Definition: It is an assemblage of a number of resistance bodies (known as member) having no relative motion b/w them and meant for carrying loads having straining action. A railway bridge, a roof trues machine frames etc are the example of structure. Read More »

Difference between a Machine and a Structure

The following differences between a machine and a structure are important from the subject (Machine Design) point of view.   1. The parts of machine move relative to one another, whereas the members of a structure do not move relative to one another. 2. A machine transforms the available energy into some useful work, whereas in a structure no energy ... Read More »

Kinematic Pair (Definition)

Definition: 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. source: Thermodynamics by Youns A. Cengel Read More »

Classifications of Machine Design

The machine design may be classified as follows : 1. Adaptive design. In most cases, the designer’s work is concerned with adaptation of existing designs. This type of design needs no special knowledge or skill and can be attempted by designers of ordinary technical training. The designer only makes minor alternation or modification in the existing designs of the product. ... Read More »

General Considerations in Machine Design

General Considerations in Machine Design

General Considerations in Machine Design Following are the general considerations in designing a machine component: 1. Type of load and stresses caused by the load. The load, on a machine component, may act in several ways due to which the internal stresses are set up. 2. Motion of the parts or kinematics of the machine. The successful operation of any ... Read More »

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