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Technical Graphics is used to communicate the necessary technical information required for manufacture and assembly of machine components. These drawings follow rules laid down in national and International Organizations for Standards (ISO).

Hence the knowledge of the different standards is very essential. Students have to be familiar with industrial drafting practices and thorough understanding of production drawings to make themselves fit in industries. The following topics have been covered to fulfill the above objectives.

Classification of Machine Drawings, Principles of Drawings, Sectioning, Dimensioning, Limits, Fits and Tolerance, Symbols and Conventional Representation, Screw Fasteners, Key Joints, Coupling and its Types, Riveted Joints, Welded Joints, Structural Applications, Assembly Drawings, Production Drawings, Reproduction of Drawing, Introduction of Computer Aided Drafting, Introduction of Solid 3D Modeling.

 

Lecture No.

Topics

1

Introduction

  • Need of Graphical Language

  • Importance Machine Drawing

  • Tools (from Instruments to Current Softwares)

2

Projections

  • Designation

  • Relative position of views

  • Examples

3

Classification of Machine Drawings (with examples)

  • Assembly Drawing

  • Part Drawing

  • Detailed Drawing

  • Catalogues Drawing

4

Classification of Machine Drawings (with examples)

  • Drawing for Instruction Manuals

  • Schematic Representation

  • Patent Drawing

5

Principles of Drawings

  • Scales as per ISO standards, eg. A3 x 3 (420 x891)

  • Importance of Title Block and Part list

  • Lines types (Lines used in Machine Drawings)

6

Sectioning

  • Cutting Planes and Section

  • Hatching Lines

  • Half Sections

  • Aligned Sections

  • Offset Sections

7

Sectioning

  • Revolved

  • Removed Sections

  • Local Sections

  • Successive Sections

  • Thin Sections

8

Dimensions (with examples)

  • Principle of Dimensioning

  • Counter Sink,

  • Counter Bores

  • Spot Faces

9

Dimensions (with examples)

  • Chamfers

  • Screw Threads

  • Tapered Features

10

Limits, Fits and Tolerance

  • Definitions

  • Classifications of Fits

  • System of Fits`

  • Computations

  • Selection of Fits

  • Method of Indicating Fits on Drawings

11

Limits, Fits and Tolerance

  • Tolerance Grade

  • Computations of Tolerance

  • Positions of Tolerance

  • Fundamental of Deviations

  • Shaft and Hole Terminology

  • Method of Placing Limit Dimensions

12

Limits, Fits and Tolerance

  • Need of Geometrical Tolerance

  • Geometrical Characteristics of Symbols

  • Indication of MMC

  • Interpretation of Indication of Geometrical Tolerance

13

Conventional Representations

  • Common features, Springs, Gear Assemblies

14

Conventional Representations

  • Materials

  • Interrupted views and Braking of Shaft, Pipe, Bar

  • Surface finishing & Machining Symbols

15

Abbreviations and Symbols

16

Screwed Fastenings

  • Screw Thread Nomenclature

  • Threads Form

  • Form of V Threads

  • Form of Square Threads

  • Conventional representations

17

Screwed Fastenings

  • Types of Bolts

  • Designation

  • Types of Nuts

  • Types of Screw

  • Designation of Bolted Joints

  • Stud Joints

  • Types of Nut Locking Arrangements

  • Special Types of Bolts and Nuts.

18

Key Joints

  • Types of Key joints

  • Type of Cotter Joints

  • Types of Pin Joints and knuckle Joints

19

Riveted Joints

  • Introduction Rivet and Riveting

  • Classification of Rivet

  • Terminology of Riveted Joint

  • Types of Joints

20

Welded Joints

  • Introduction of Welding Process

  • Types of Welded Joints

  • Representation of Welds

  • Symbols and its conventions

21

Structural Applications

22

Pipes and Pipe Joints

  • General discussions

  • Types of Pipe Joints

  • Piping Layout and Conventions

23

Pulleys

  • Applications of Pulleys

  • Types of Pulleys

24

Couplings

  • Applications of Couplings

  • Types of Couplings

  • Working Principles

25

Assembly Drawings

  • Introduction

  • Types of Assembly

  • Importance of BOM

  • Assembly procedures

26

Assembly Drawings (Examples)

  • Assembly of Engine Parts: 10

  • Assembly of Machine Tools Parts: 5

27

Production Drawings

  • Definitions

  • Difference with Normal Drawings

  • Method of amendment of Corrections

28

Production Drawings

  • Examples 3 Nos.

29

Reproduction of Drawing

  • Blue printing

  • Ammonia Printing

  • Xeroxing

  • Printing

  • Plotting

30

Introduction of Computer Aided Drafting

  • Computer Aided Drafting and Design

  • Advantages of Computer Aided Drafting and Design

  • CAD Softwares

31

Introduction of Solid 3D Modeling

  1. Bertoline, Wiebe, Miller, Nasma., Technical Graphics Communication, IR WIN Graphic Series

  2. William P. Spence, Engineering Graphics, Printice - Hall Inc, Engle Wood Cliff

  3. S. Bogolyubov. A. Voinov., Engineering Drawing, Van Nostr and Reinhold Company

  4. Brain Griffiths., Engineering Drawing for Manufacture, Kogan Page Science, USA

  5. Hart. K R, Engineering Drawing with Problems and Solutions, Hodder and Stoughton, London Sydney Auckland

  6. David L., Goetsch Williams Chaulk John A., Nelson, Technical Drawing (Drafting and Design) Savee Informatics.

  7. D.E. Hewitt., Engineering Drawing and Design for Mechanical Technicians, The Macmillan Press Ltd, London



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