MACHINE DESIGN

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GUJARAT TECHNOLOGICAL UNIVERSITY

MECHANICAL ENGINEERING

B.E. 7TH Semester

Subject Code: 2171909

MACHINE DESIGN

  1. Gear Design: Recitation: Classification of gears, Selection of type of gears, Law of Gearing, Gear terminology, Standard system of gears tooth, force analysis, Interference and undercutting, number of teeth, gear tooth failures, selection of material. Spur and Helical Gears: Stress in gear tooth, Lewis’s formula, AGMA bending stress equation and AGMA pitting resistance formula, Gear quality and selection aspects. Bevel and Worm gear: Specification and design of bevel and worm gears. 
  2. Design of Gear Box for Machine Tools: Comparison and Choice of progression (Arithmetic, Geometric, Harmonic and Logarithmic), general design procedure, determination and fixation of spindle speeds, selection of the best structure diagram, selection of gear layout and ray diagram, determination of number of teeth on gears.
  3. Journal Bearings: Classification of bearings. Journal bearing Types, Lubrication: type of lubrication, Lubricants, Effect of pressure and temperature on viscosity, Stable lubrication, thin and thick film lubrication. Hydrostatic Bearing: Viscous flow through rectangular slot, step bearing, energy losses. Hydrodynamic Bearing: Lubrication theory (Petroff’s Equation, Reynold’s Equation), Design of bearing with Raimondi and Boyd method, power and heat generation, bearing materials.
  4. Rolling Contact Bearings: Classification, Static load carrying capacity, Stribeck’s equation, Dynamic load carrying capacity, Equivalent bearing load, Load-Life relation, Selection of bearing life, Load factor, Selection of bearing from catalogue, Design for cyclic loads and speeds, bearing with probability of survival other than 90%, Selection of taper roller bearing, Bearing failure, Lubrication of rolling contact bearing.
  5. IC Engine Components: Design of cylinder and Cylinder head, Design of piston, Design of connecting rod, Design of crankshaft and Design of valve gear mechanisms.
  6. Design of Cranes: Basic objective of material handling system, Types of loads, Classification and application of various Material handling equipment, Basic principles in selection of material handling system, Classification of cranes, Stress analysis and selection of Hooke (IS 15560,2005), Pulley System (hoisting tackle analysis), Steel wire ropes: Classification and coding, Stress analysis and selection, Design of Sheave and drums.

Spur Gears

1
Introduction
2
Classification of Gears
3
Selection of Types of Gears
4
Condition for Correct Gearing
5
Forms of Gear Teeth
6
Spur Gear Terminology
7
Interference in Involute Gears
8
Minimum Number of Teeth to Avoid Interference
9
Standard System of Gear Tooth
10
Effects of Pressure Angle
11
Force Analysis of Spur Gears
12
Types (Modes) of Gear Tooth Failure
13
Selection of Gear Materials
14
Beam Strength of Spur Gear Tooth
15
Wear Strength of Spur Gear Tooth
16
Effective Load on Spur Gear Tooth
17
Safety of Gear Pair
18
Objectives in Design of Gear Pair
19
Design of Spur Gear Pair
20
Power Transmitting Capacity of Spur Gear Pair
21
Gear Lubrication
22
Multi-stage Gear Reducer

Helical Gears

1
Introduction
2
Types of Helical Gears
3
Advantages and Limitations of Helical Gears
4
Helical Gear Terminology
5
Equivalent Spur Gear and Virtual (Formative) Number of Teeth
6
Minimum Number of Teeth on Helical Pinion
7
Force Analysis of Helical Gears
8
Beam Strength of Helical Gear Tooth
9
Wear Strength of Helical Gear Tooth
10
Effective Load on Helical Gear Tooth
11
Safety of Helical Gear Pair

Bevel Gears

1
Introduction
2
Terminology of Bevel Gears
3
Formative Number of Teeth (Tredold’s Proximation)
4
Minimum Number of Teeth on Bevel Pinion
5
Force Analysis of Straight Bevel Gears
6
Types (Mode) of Bevel Gear Tooth Failure
7
Materials for Bevel Gears
8
Beam Strength of Straight Bevel Gear Tooth
9
Wear Strength of Straight Bevel Gear Tooth
10
Effective Load on Straight Bevel Gear Tooth
11
Safety of Bevel Gear Pair
12
Types of Bevel Gears

Worm Gears

1
Introduction
2
Advantages and Limitation of Worm Gear Drives
3
Terminology of Worm and Worm Gears
4
Designation of Worm and Worm Gear Pair
5
Types of Worm and Worm Gears
6
Force Analysis of Worm and Worm Gear Pair
7
Sliding (Rubbing) Velocity in Worm and Worm Gear Pair
8
Coefficient of Friction in Worm and Worm Gear Pair
9
Efficiency of Worm and Worm Gear Pair
10
Types (Modes) of Failure in Worm Gear Pair
11
Worm and Worm Gear Materials
12
Design of Worm Gear Drive
13
Beam Strength of Worm Gear Tooth
14
Wear Strength of Worm Gear Tooth
15
Effective Load on Worm Gear Tooth
16
Safety of Worm Gear Pair
17
Thermal Considerations in Worm Gear Drive
18
Arrangements of Worm Gear Reducer
19
Lubrication of Worm Gears

Design of Machine Tool Gear Boxes

1
Need of Multi-Speed Gear Box in Machine Tools
2
Basic Considerations in Design of Multi-Speed Gear Box
3
Laws of Stepped Regulation of Speeds in Multi-Speed Gear Box
4
Advantages of Geometric Progression
5
Selection of Geometric Progression Ratio in Multi-Speed Gear Box
6
Parameters in Kinematic Design of Multi-Speed Gear Box
7
Kinematic Diagram (Gearing Diagram) of Gear Box
8
Structural Formulae
9
Structure Diagrams
10
Speed Diagram and Ray Diagrams
11
General Guideline in Developing Kinematic Diagram (Gearing Diagram) for Multi-Speed Gear box
12
Procedure for Kinematic Design of Multi-Speed Gear Box for Machine Tools
13
Deviation Diagram for Multi-Speed Gear Box

Hydrodynamic Bearings

1
Introduction to Lubrication
2
Lubricant
3
Physical and Chemical Properties of Lubricants
4
Desirable Properties of Lubricants
5
Classification of Lubricants
6
Lubricating Oil (Liquid Lubricants)
7
Greases
8
Solid Lubricants
9
Selection of Lubricants
10
Basic Modes of Lubrication
11
Types of Sliding Contact Bearings
12
Petroff’s Equation for Hydrodynamic Journal Bearings
13
Nomenclature of Hydrodynamic Journal Bearing
14
Regimes of Hydrodynamic Lubrication
15
Reynold’s Equation for Hydrodynamic Lubrication
16
Design Considerations in Hydrodynamic Journal Bearings
17
Relations of Variables for Hydrodynamic Journal Bearenigs (Raimondi and Boyd Method)
18
Temperature Rise in Hydrodynamic Journal Bearings with Feed Lubrication
19
Temperature Rise in Self-Contained or Self Cooled Hydrodynamic Journal Bearings
20
Selection of Bearing Design Variables for Hydrodynamic Journal Bearings
21
Design Procedure for Hydrodynamic Journal Bearings
22
Bearing Materials

Hydrostatic Bearings

1
Introduction to Hydrostatic Lubrication
2
Hydrostatic Lubrication System
3
Flow of Viscous Fluid Through Rectangular Slot
4
Hydrostatic Step Bearing
5
Power Losses in Hydrostatic Step Bearing
6
Optimum Design of Hydrostatic Step Bearing
7
Temperature Rise in Hydrostatic Bearing

Rolling Contact Bearings

1
Introduction to Bearings
2
Nomenclature of Rolling Contact Bearing
3
Types of Loads on Rolling Contact Bearings
4
Types of Rolling Contact Bearings
5
Designation of Rolling Contact Bearings
6
Factors Affecting Selection of Bearing Type
7
Basic Static Capacity (Basic Static Load Rating) of bearings (Co)
8
Stribeck’s Equation for Basic Static Capacity of Bearings
9
Equivalent Static Load
10
Bearing Life
11
Basic Dynamic Capacity (Basic Dynamic Load Rating) of Bearings (C)
12
Equivalent Dynamic Load
13
Load-Life Relationship
14
Selection of Bearing Life
15
Selection of Bearing from Manufacturer’s Catalogue
16
Bearings with Probability of Survival Higher Than 90 Percent
17
Adjusted Life of Bearing
18
Equivalent Dynamic Load for Bearing under Cyclic Loads
19
Equivalent Dynamic Load for Continuously Variable Cyclic Loads
20
Mounting of Bearings
21
Preloading of Bearings
22
Taper Roller Bearing
23
Lubrication of Rolling Contact Bearings
24
Failure of Rolling Contact Bearings

Design of I.C Engine Components

1
Introduction
2
Cylinder and Cylinder Head
3
Piston
4
Connecting Rod
5
Crankshaft
6
Valve Gear Mechanism

Design of Cranes

1
Introduction to Material Handling
2
System Concept for Material Handling
3
Types of Loads Handled by Material Handling Systems
4
Material Handling Equipment and Guidelines in Selection
5
Objectives of Material Handling System
6
Classification of Material Handling Equipment
7
Hoisting Equipment
8
Classification of Cranes
9
Components of EOT Crane
10
Crane Hook Assembly with Pulleys
11
Pulley System
12
Wire Rope
13
Rope Drum
14
Bridge Structure
15
Drives (Motors)
16
Power Rating of Trolley Motor and Bridge Motor
17
Factor of Safety and Permissible Stress

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