## Articles Posted in the " Machine Design " Category

• ### DEGREES OF FREEDOM-1

DEGREES OF FREEDOM -1 PRACTICAL EXAMPLES FOR VARIOUS DEGREES OF FREEDOM  1. EXAMPLES SYSTEMS WITH ONE DEGREE OF FREEDOM A single mass spring system A disc and a shaft system A simple pendulum A crank has only one degree of freedom A four bar linkage has only one degree of freedom 2. EXAMPLES SYSTEMS WITH TWO […]

• ### DEGREES OF FREEDOM -3

DEGREES OF FREEDOM – 3 KINEMATIC CONSTRAINTS The motion of the independent rigid bodies can be controlled with kinematic constraints.A Kinematic constraint  between two or more rigid bodies decreases the degrees of freedom for the connected rigid bodies.Main classification of kinematic pairs falls in three categories. However these three categories are further sub divided as described […]

• ### DEGREES OF FREEDOM-2

DEGREES OF FREEDOM-2 One particle in space has Degrees of freedom = 3 A body has Degrees of freedom in space =6 Thus analysis of a particle and rigid body is entirely different. Single plane degrees of freedom Rigid body in one plane has three degrees of freedom=One rotational + two transnational Single rigid body in […]

• ### Flywheel design

Flywheel design (a) DESIGN OF RIM Stresses in a rim Tensile stress due to centrifugal force σt = ρv2 Tensile stresses due to bending of arms σb = M/Z BENDING MOMENT M = wL2/12 w = UDL =Centrifugal force between two arms per unit length w = mRω2 =ρbtLR ω2/L w = mRω2 =ρbtR ω2 […]

• ### Flywheel Theory

Flywheel Theory  FLYWHEEL Flywheel is an energy storage device where more power is available in the working stroke. It supplies back this energy to the machine in the remaining strokes of the cycle and maintains a constant speed of the machine. Four stroke internal combustion engines develop power only during the working stroke which is […]

• ### INTERVIEW SHORT QUESTION ANSWERS ON MACHINE DESIGN

INTERVIEW SHORT QUESTION ANSWERS ON MACHINE DESIGN Definition of design It is a process to create an object/machine to perform the required function satisfactorily over a reasonable period of time (life) with minimum cost. Definition of design synthesis It is a process to find various alternatives of a product/mechanism  to achieve the desired function satisfactorily […]

• ### Mcq: levers

Mcq: levers Class 1 levers have Effort between the load and the fulcrum Fulcrum placed between the effort and load Load in-between the effort and the fulcrum None Ans: (ii) Class 2 levers have Effort between the load and the fulcrum Fulcrum placed between the effort and load Load in-between the effort and the fulcrum […]

• ### INTERVIEW SHORT QUESTION ANSWERS- couplings

INTERVIEW SHORT QUESTION ANSWERS-couplings Q. What is a flexible coupling, give examples and their practical applications? A. A coupling is used to connect two power transmitting shafts having same RPM. It also accommodates misalignment and axial end movement of the shaft. Hence these are also called flexible couplings or compensating couplings. Small misalignment may be linear, […]

• ### INTERVIEW SHORT QUESTION ANSWERS – levers and couplings

SHORT INTERVIEW QUESTION ANSWERS – levers and couplings Q. What are the differences between the hand and the foot levers? A. Sr. No. Hand lever Foot lever 1. Operated by hand Operated by foot 2. Longer in size requiring less effort Smaller in size requiring more effort 3. Response time is less. Response time slightly […]

• ### INTERVIEW SHORT QUESTION ANSWERS: RIVETED JOINTS

INTERVIEW SHORT QUESTION ANSWERS: RIVETED JOINTS Q.Write down the important terms used in the design of riveted joints. A. (i) nominal pitch or short pitch (ii) Medium pitch Long pitch Row pitch or back pitch or transverse pitch Diagonal pitch Margin Marginal distance Strap thickness Plate thickness  shank diameter  tail  head Types of rivets Caulking […]