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Design of Machine Elements



T.Y.Diploma Sem VI Computer Engineering Group MSBTE

Design of Machine Elements

Author: Rajesh Choudhari

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1. Introduction to Design

1. Basic Design Considerations

1.1 Design Philosophy

1.2 Machine Design

1.3 Types of Loads

1.4 Concept of Stress

1.5 Creep

2. Factors in Design

2.1 Factor of Safety

2.2 Stress Concentration

2.3 Converting Actual Load or Torque into Design Load or Torque using Design Factors

3. Properties of Engineering Materials

3.1 Design Considerations in Selection of Materials

3.2 Mechanical Properties of Materials

3.3 Engineering Materials

3.4 Commercial Designation of Materials

3.5 Standardization in Design

3.6 Design Data Book

3.7 Preferred Numbers

4. Theories of Failure Under Static Loading

5. Modern Design Considerations

5.1 Design for Safety

2. Design of Joints, Levers and Offset Links

1. Introduction

2. Cotter Joint

2.1 Design of Cotter Joint (Socket and Spigot Joint)

2.2 Design of Sleeve and Cotter Joint

3. Knuckle Joint

3.1 Design of Knuckle Joint

4. Turn Buckle

4.1 Design of Turn Buckle

5. Levers

5.1 Types of Levers

5.2 Design of Lever

5.3 Design of First Type of Lever (One Arm Levers)

5.4 Design of Bell Crank Lever

5.5 Design of Lever Safety Valve

5.6 Design of Machine Parts Subjected to Combined Loading

5.7 Design Procedure of Offset Links

6. C-clamp and Overhang Crank

3. Design of Shafts, Keys and Couplings

1. Design of Shafts

1.1 Types of Shafts

1.2 Difference between Shaft and Axle

1.3 Materials for Shafts

1.4 Design Criteria for Shafts

1.5 Design of Shafts on the Basis of Torsional Rigidity

1.6 Causes of Failure in Shaft

1.7 A.S.M.E. Code for Shaft Design (Shafts Subjected to Fluctuating Loads)

1.8 Hollow Shafts

2. Keys

2.1 Functions

2.2 Types of Keys

2.3 Design of Key

2.4 Relation between Stress for a Square Key Equally Strong in Crushing and Shearing

2.5 Effect of Keyways

3. Couplings

3.1 Introduction of Couplings

3.2 Muff or Sleeve Coupling

4. Flange Coupling

4.1 Unprotected and Protected Type of Flange Coupling

5. Bushed Pin Type Flexible Flange Coupling

5.1 Design Procedure of Bushes Pin Type Flexible Coupling

6. Design of Spur Gear

6.1 Classification of Gears

6.2 Spur Gears

6.3 Design Considerations for a Gear Drive

6.4 Lewis Equation for Static Bear Strength of Spur Gear Teeth

6.5 Power Transmission Capacity of Spur Gear in Bending

6.6 Design Procedure for Spur Gear

6.7 Gear Tooth Failure

4. Design of Power Screws

1. Introduction

1.1 Terminology of Power Screw

1.2 Thread Profiles used for Power Screws

1.3 Multiple Threaded Screws

1.4 Analysis of Power Screws

1.5 Self-Locking and Over-Hauling Screws

1.6 Efficiency of Power Screw

1.7 Efficiency of Screw Jack

1.8 Maximum Power Transmission Efficiency

1.9 Types of Stresses Induced in Power Screws

2. Design of Screw Jack

3. Design of Toggle Jack

5. Design of Springs

1. Introduction

2. Applications and Classification of Springs

2.1 Applications and Functions of Springs

2.2 Classification of Springs

2.3 Materials for Helical Springs

2.4 Spring Terminology

2.5 Stresses in Helical Tension and Compression Springs

2.6 Wahl’s Correction Factor (Kw)

2.7 Deflection of Helical Springs

2.8 Energy Stored in Springs

3. Design of Helical Tension and Compression Springs

4. Leaf Springs

6. Design of Threaded and Welded Joint

1. Introduction of Threaded Joints

1.1 Stresses in Screwed Fasteners

1.2 Bolts of Uniform Strength

1.3 Design of Bolted Joints Subjected to Eccentric Loading

2. Design of Welded Joints

2.1 Classification of Welded Joints)

2.2 Design of Transverse Fillet Weld Axially Loaded (Symmetrical section)

2.3 Design of Parallel Fillet Welded Joints

2.4 Design of Combination of Transverse and Parallel Fillet Weld

7. Antifriction Bearings

1. Introduction

1.1 Classification of Bearings

1.2 Applications

1.3 Properties of Sliding Contact Bearing Materials

1.4 Comparisons

2. Terminology of Ball Bearings

3. Selection of Ball Bearing using Manufacturer’s Catalogue

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