MACHINE DESIGN
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GUJARAT TECHNOLOGICAL UNIVERSITY
MECHANICAL ENGINEERING
B.E. 7TH Semester
Subject Code: 2171909
MACHINE DESIGN
 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.Â
 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.
 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.
 Rolling Contact Bearings: Classification, Static load carrying capacity, Stribeck’s equation, Dynamic load carrying capacity, Equivalent bearing load, LoadLife 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.
 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.
 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

1Introduction

2Classification of Gears

3Selection of Types of Gears

4Condition for Correct Gearing

5Forms of Gear Teeth

6Spur Gear Terminology

7Interference in Involute Gears

8Minimum Number of Teeth to Avoid Interference

9Standard System of Gear Tooth

10Effects of Pressure Angle

11Force Analysis of Spur Gears

12Types (Modes) of Gear Tooth Failure

13Selection of Gear Materials

14Beam Strength of Spur Gear Tooth

15Wear Strength of Spur Gear Tooth

16Effective Load on Spur Gear Tooth

17Safety of Gear Pair

18Objectives in Design of Gear Pair

19Design of Spur Gear Pair

20Power Transmitting Capacity of Spur Gear Pair

21Gear Lubrication

22Multistage Gear Reducer
Helical Gears

23Introduction

24Types of Helical Gears

25Advantages and Limitations of Helical Gears

26Helical Gear Terminology

27Equivalent Spur Gear and Virtual (Formative) Number of Teeth

28Minimum Number of Teeth on Helical Pinion

29Force Analysis of Helical Gears

30Beam Strength of Helical Gear Tooth

31Wear Strength of Helical Gear Tooth

32Effective Load on Helical Gear Tooth

33Safety of Helical Gear Pair
Bevel Gears

34Introduction

35Terminology of Bevel Gears

36Formative Number of Teeth (Tredold's Proximation)

37Minimum Number of Teeth on Bevel Pinion

38Force Analysis of Straight Bevel Gears

39Types (Mode) of Bevel Gear Tooth Failure

40Materials for Bevel Gears

41Beam Strength of Straight Bevel Gear Tooth

42Wear Strength of Straight Bevel Gear Tooth

43Effective Load on Straight Bevel Gear Tooth

44Safety of Bevel Gear Pair

45Types of Bevel Gears
Worm Gears

46Introduction

47Advantages and Limitation of Worm Gear Drives

48Terminology of Worm and Worm Gears

49Designation of Worm and Worm Gear Pair

50Types of Worm and Worm Gears

51Force Analysis of Worm and Worm Gear Pair

52Sliding (Rubbing) Velocity in Worm and Worm Gear Pair

53Coefficient of Friction in Worm and Worm Gear Pair

54Efficiency of Worm and Worm Gear Pair

55Types (Modes) of Failure in Worm Gear Pair

56Worm and Worm Gear Materials

57Design of Worm Gear Drive

58Beam Strength of Worm Gear Tooth

59Wear Strength of Worm Gear Tooth

60Effective Load on Worm Gear Tooth

61Safety of Worm Gear Pair

62Thermal Considerations in Worm Gear Drive

63Arrangements of Worm Gear Reducer

64Lubrication of Worm Gears
Design of Machine Tool Gear Boxes

65Need of MultiSpeed Gear Box in Machine Tools

66Basic Considerations in Design of MultiSpeed Gear Box

67Laws of Stepped Regulation of Speeds in MultiSpeed Gear Box

68Advantages of Geometric Progression

69Selection of Geometric Progression Ratio in MultiSpeed Gear Box

70Parameters in Kinematic Design of MultiSpeed Gear Box

71Kinematic Diagram (Gearing Diagram) of Gear Box

72Structural Formulae

73Structure Diagrams

74Speed Diagram and Ray Diagrams

75General Guideline in Developing Kinematic Diagram (Gearing Diagram) for MultiSpeed Gear box

76Procedure for Kinematic Design of MultiSpeed Gear Box for Machine Tools

77Deviation Diagram for MultiSpeed Gear Box
Hydrodynamic Bearings

78Introduction to Lubrication

79Lubricant

80Physical and Chemical Properties of Lubricants

81Desirable Properties of Lubricants

82Classification of Lubricants

83Lubricating Oil (Liquid Lubricants)

84Greases

85Solid Lubricants

86Selection of Lubricants

87Basic Modes of Lubrication

88Types of Sliding Contact Bearings

89Petroff's Equation for Hydrodynamic Journal Bearings

90Nomenclature of Hydrodynamic Journal Bearing

91Regimes of Hydrodynamic Lubrication

92Reynold's Equation for Hydrodynamic Lubrication

93Design Considerations in Hydrodynamic Journal Bearings

94Relations of Variables for Hydrodynamic Journal Bearenigs (Raimondi and Boyd Method)

95Temperature Rise in Hydrodynamic Journal Bearings with Feed Lubrication

96Temperature Rise in SelfContained or Self Cooled Hydrodynamic Journal Bearings

97Selection of Bearing Design Variables for Hydrodynamic Journal Bearings

98Design Procedure for Hydrodynamic Journal Bearings

99Bearing Materials
Hydrostatic Bearings
Rolling Contact Bearings

107Introduction to Bearings

108Nomenclature of Rolling Contact Bearing

109Types of Loads on Rolling Contact Bearings

110Types of Rolling Contact Bearings

111Designation of Rolling Contact Bearings

112Factors Affecting Selection of Bearing Type

113Basic Static Capacity (Basic Static Load Rating) of bearings (Co)

114Stribeck's Equation for Basic Static Capacity of Bearings

115Equivalent Static Load

116Bearing Life

117Basic Dynamic Capacity (Basic Dynamic Load Rating) of Bearings (C)

118Equivalent Dynamic Load

119LoadLife Relationship

120Selection of Bearing Life

121Selection of Bearing from Manufacturer's Catalogue

122Bearings with Probability of Survival Higher Than 90 Percent

123Adjusted Life of Bearing

124Equivalent Dynamic Load for Bearing under Cyclic Loads

125Equivalent Dynamic Load for Continuously Variable Cyclic Loads

126Mounting of Bearings

127Preloading of Bearings

128Taper Roller Bearing

129Lubrication of Rolling Contact Bearings

130Failure of Rolling Contact Bearings
Design of I.C Engine Components
Design of Cranes

137Introduction to Material Handling

138System Concept for Material Handling

139Types of Loads Handled by Material Handling Systems

140Material Handling Equipment and Guidelines in Selection

141Objectives of Material Handling System

142Classification of Material Handling Equipment

143Hoisting Equipment

144Classification of Cranes

145Components of EOT Crane

146Crane Hook Assembly with Pulleys

147Pulley System

148Wire Rope

149Rope Drum

150Bridge Structure

151Drives (Motors)

152Power Rating of Trolley Motor and Bridge Motor

153Factor of Safety and Permissible Stress
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