 # Mechanics of Machine Teacher

##### Kailash Kumar Sahu Category

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# Code(Credit) : DIME 0101 (2-1-0)

## Course Objectives

• Understanding machine as a system consisting of different link assemblies as components
• Comprehending Working principle of machine components such as clutch, brakes, bearings based on friction
• Comprehending working principles related to power transmission systems and predicting the work involved and efficiency
• Comprehending working principles in speed and torque regulating devices such as governor and flywheels
• Determination of amount and position of masses required towards static and dynamic balancing

## Learning Outcomes

• Identify mechanisms in real life applications.
• Perform kinematic analysis of simple mechanisms.
• Perform static and dynamic force analysis of slider crank mechanism.
• Determine moment of inertia of rigid bodies experimentally.
• Perform motions and working of belt, gears and governors.

## Course Syllabus

MODULE I
General Mechanics: Basic Principle of Mechanics:, Moment, Equilibrium, Conditions of equilibrium. work, power , energy, lever

Force: types of forces, laws of forces, lami’s theorem
Centroid: Geometrical properties – Definitions and examples of Symmetrical, Anti-Symmetrical, Asymmetrical shapes - Definitions of centre of gravity and centroid - Centroid of Symmetrical shapes ( solid / hollow square, rectangular, circular, I Sections ) - Centroid of Asymmetrical shapes (I section)
Moment of inertia: Definitions of: Inertia, Moment of Inertia, Polar moment of inertia, Parallel and perpendicular axes theorems - Derivation of expressions for M.I / Polar M I of regular geometrical plane sections (rectangle, circle, triangle) – M.I about centroidal axis / base, Numerical problems.

MODULE II
Simple mechanism
Link, kinematic chain, mechanism, machine. Inversion, four bar link mechanism and its inversion. Lower pair and higher pair.

Cam and followers,Friction Friction between nut and screw for square thread, screw jack. Bearing and its classification, Description of roller, needle roller & ball bearings. Torque transmission in flat pivot & conical pivot bearings. Flat collar bearing of single and multiple types. Torque transmission for single and multiple clutches. Working of simple frictional brakes.

PRACTICE

• Experiment using clutch to calculate torque
• Experiment using brake to calculate braking torque

MODULE III
Power Transmission Concept of power transmission. Type of drives, belt, gear and chain drive. Computation of velocity ratio, length of belts (open &cross) with and without slip. Ratio of belt tensions, centrifugal tension and initial tension. Power transmitted by the belt. V-belts and V-belts pulleys.Concept of crowning of pulleys .Gear drives and its terminology. Gear trains, Working principle of simple, compound, reverted and epicyclic gear trains.
Governors and Flywheel Function of governor, Classification of governor. Working of Watt, Porter, Proel and Hartnell governors. Conceptual explanation of sensitivity, stability and isochronism.
Function of flywheel Comparison between flywheel & governor. Fluctuation of energy and coefficient of fluctuation of speed.

PRACTICE

• Experiment on belt drive to calculate velocity ratio
• Experiment on chain drive to calculate velocity ratio
• Experiment on gear drive to calculate velocity ratio
• Experiment on simple gear train to calculate velocity ratio
• Experiment on compound gear train to calculate velocity ratio
• Experiment on riverted gear train to calculate velocity ratio
• Experiment on epicyclic gear train to calculate velocity ratio
• Experiment on governor to calculate the fluctuation of speed
• Experiment on centrifugal governor to calculate the fluctuation of speed
• Experiment on flywheel to calculate the fluctuation of energy

Text Books:
1.Theory of Machines by R S Khurmi
2.Theory of Machines by R K Rajput
3.Engineering Mechanics by R.K Bansal

## Session 1

LECTURE:
Basic Principle of Mechanics:, Moment, Equilibrium, Conditions of equilibrium. work, power , energy, leverBasic Principle of Mechanics:, Moment, Equilibrium, Conditions of equilibrium. work, power , energy, lever

(These are the simple definitions.by using proper example which is happening day to day life and graph )

Quiz

STUDY MATERIALS:

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 26, 32, 49, 657, 668

## Session 2

LECTURE:

Types of forces, laws of forces

(These are the application of forces.by proper definition, derivation and solved some problem)

STUDY MATERIALS:

Types of Force and laws of force

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 15, 16, 17

## Session 3

LECTURE:

Lami’s theorem

Lecture(These are the application of forces.by proper definition,derivation and solved some problem)

STUDY MATERIALS:

Lamis's Theorem

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 56

## Session 4

LECTURE:

Geometrical properties – Definitions and examples of Symmetrical, Anti-Symmetrical, Asymmetrical shapes - Definitions of the centre of gravity and centroid

(These are the simple definitions.by using a proper example which is happening day to day life)

STUDY MATERIALS:

Centre of Gravity

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 78, 79

## Session 5

LECTURE:

Centroid of Symmetrical shapes ( solid / hollow square, rectangular, circular, I Sections ) - Centroid of Asymmetrical shapes I section

(These are geometrical figure.by calculation and deriving find out centroid)

STUDY MATERIALS:

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 80-90

## Session 6

LECTURE:

Definitions of: Inertia
(These are the simple definitions.by using proper example which is happening day to day life)

STUDY MATERIALS:

Inertia

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 102-110

## Session 7

LECTURE:

Moment of Inertia, Polar moment of inertia moment of Inertia

(These are the simple definitions.by using a proper example which is happening day to day life)

STUDY MATERIALS:

Moment of Inertia

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 102-104

## Session 8

LECTURE:

Parallel axes theorems

(These are the theorems.by deriving and calculating)

STUDY MATERIALS:

Parallel axis theorem

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 16

## Session 9

LECTURE:

Perpendicular axes theorems

Lecturer(These are the theorems.by deriving and calculating)
Assignment

STUDY MATERIALS:

Perpendicular axis theorem

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 104

## Session 10

LECTURE:

Derivation of expressions for M.I / Polar M I of regular geometrical plane sections (rectangle, circle, triangle) – M.I about centroidal axis

(These are the theorems.by deriving and calculating)

Assignment

STUDY MATERIALS:

Moment of Inertia

A Textbook of Engineering Mechanics by R. S. KhurmiPage No: 105-115

## Session 11

LECTURE:

(These are the simple definitions.by using a proper example which is happening day to day life)

quiz

STUDY MATERIALS:
A Text Book of Theory of Machines by Dr.R K Bansal, Page 1,2,3

## Session 12

LECTURE:

Inversion, four bar link mechanism and its inversion

(These are the simple difinitions.by using proper example which is happening day to day life)

Assignment

STUDY MATERIALS:

Inversion of four bar mechanism

A Text Book of Theory of Machines by Dr.R K Bansal, Page 11,12,13,14,15

## Session 13

LECTURE:

Lower pair and higher pair

(These are the simple definitions.by using proper example which is happening day to day life)

Assignment & Presentation

STUDY MATERIALS:

Lower and higher pair

A Text Book of Theory of Machines by Dr.R K Bansal, Page 3

## Session 14

LECTURER:

Cam and followers

(Explain function and application)Lab(how it is working in automobile engine) Presentation

STUDY MATERIALS:

Cam and follower

A Text Book of Theory of Machines by Dr.R K Bansal, Page 889,890,891,892

## Session 15

LECTURE:

Bearing and its classification, Description of roller, needle roller & ball bearings

(Explain function and application)Lab(find out wear and tear)

Assignment

STUDY MATERIALS:

Bearings

## Session 16

LECTURE:

Torque transmission for single and multiple clutches. Working of simple

(Explain function and application)

PRACTICE:

(find out torque)

STUDY MATERIALS:

Clutches

A Text Book of Theory of Machines by Dr.R K Bansal, Page 1,2,3

## Session 17

LECTURE:
Working of simple frictional brakes.
(Explain function and application)

PRACTICE:
Lab(find out torque)

STUDY MATERIALS:
Mechanical Brakes

A Text Book of Theory of Machines by Dr.R K Bansal, Page 300,301,302.

## Session 18

LECTURE:
types of belt drive
(Explain function and applicaation)

PRACTICE:
(find out velocity ratio)

STUDY MATERIALS:
Belt drives

A Text Book of Theory of Machines by Dr.R K Bansal, Page 244,245,246.

## Session 19

LECTURE:
types of chain drive
(Explain function and applicaation)

Assignment & Presentation

PRACTICE:
(find out velocity ratio)

STUDY MATERIALS:
Chain Drive 1

Chain Drive 2

A Text Book of Theory of Machines by Dr.R K Bansal, Page 244,246,247

## Session 20

LECTURE:
types of gear drive
(Explain function and applicaation)

PRACTICE:
(find out velocity ratio)

STUDY MATERIALS:
Types of Gear Drives

A Text Book of Theory of Machines by Dr.R K Bansal, Page 354.355.

## Session 21

LECTURE:
Working principle of simple, gear trains.
(Explain function and application)

PRACTICE:
(find out velocity ratio)

STUDY MATERIALS:
Gear Trains

A Text Book of Theory of Machines by Dr.R K Bansal, Page 410.

## Session 22

LECTURE:
Working principle of, compound, gear trains.
(Explain function and applicaation)

PRACTICE:
(find out velocity ratio)

STUDY MATERIALS:
Working principle of gear trains

A Text Book of Theory of Machines by Dr.R K Bansal, Page 410.

## Session 23

LECTURE:
Working principle of , reverted gear trains.
(Explain function and applicaation)

PRACTICE:
(find out velocity ratio)

STUDY MATERIALS:
Riverted gear train

A Text Book of Theory of Machines by Dr.R K Bansal, Page 411.

## Session 24

LECTURE:
Working principle epicyclic gear trains.
(Explain function and applicaation)

PRACTICE:
(find out velocity ratio)

STUDY MATERIALS:
Epicyclic gear train

A Text Book of Theory of Machines by Dr.R K Bansal, Page 412.

## Session 25

LECTURE:
Function of governor, Classification of governor
(Explain function and applicaation)

PRACTICE:
(find out fluction of speed)

STUDY MATERIALS:
Governors

A Text Book of Theory of Machines by Dr.R K Bansal, Page 719,720,721,722,

## Session 26

LECTURE:
Working principle of centrifugal governor
(Explain function and applicaation)

PRACTICE:
(find out fluctuation of speed)

STUDY MATERIALS:
Centrifugal Governor

A Text Book of Theory of Machines by Dr.R K Bansal, Page 722.

## Session 27

LECTURE:
Function of flywheel
(Explain function and applicaation)

PRACTICE:
(find out fluction of energy)

STUDY MATERIALS:
Flywheel 1

Flywheel 2

A Text Book of Theory of Machines by Dr.R K Bansal, Page 573,574,575,