Engineering Drawing Basics

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  • Layout of a typical drawing shet should be same as the background of this presentation. Nameplate at the bottom right corner.
  • Layout of a typical drawing sheet
  • HIDDEN LINES WHERE EXTENSION OF VISIBLE LINES SHOULD HAVE A GAP BETWEEN THE TWO Lines
    Single centre line for longitudinal view and crossed centre lines for cross sectional view
  • Engineering Drawing Basics

    1. 1. Lecture 1 Friday 25 April 2014 1 ENGINEERING GRAPHICS 1E7 Lecture 1: Introduction Lecturer: Dr. Bidisha Ghosh (bghosh@tcd.ie)
    2. 2. Course Structure
    3. 3. Assessment • Examination: 65% of the overall mark – 3 sections (A, B and C) – 2 questions per section – 3 questions to be answered, one from each section • Dr B. Gosh : Sections A and B • Dr G. O’Donnell : Section C • Labs 35% - assessed by coursework – 10 % AutoCAD – 10 % Pspice – 10% D.O. Tutorials Dr B. Gosh – 5 % D.O. Assignment Dr G. O’Donnell
    4. 4. Time Table
    5. 5. Lecture 1 Friday 25 April 2014 5 Syllabus – Hand Drawing 1 • Basic Construction • Orthographic Projections • Isometric Projections • Auxiliary Views • Perspective : One-Point • Perspective : Two-Point
    6. 6. Lecture 1 Friday 25 April 2014 6 Aim of the Course • Knowledge of engineering drawing instruments • Understanding and interpretation of technical drawings • Ability to develop projections of a 3D object
    7. 7. Lecture 1 Friday 25 April 2014 7 Evaluation • Examination (Sections A & B) (2/3 of the total examination marks) • Continuous Assessment (10% of the total course marks) – four drawing office tutorials
    8. 8. Lecture 1 Friday 25 April 2014 8 Waterfall M. C. Escher Technical drawing is the language of engineers and designers
    9. 9. Lecture 1 Friday 25 April 2014 9 Topics of Interest •Drawing Instruments •Lines •Dimensioning
    10. 10. Lecture 1 Friday 25 April 2014 10 1. Drawing Board DRAWING INSTRUMENTS 1
    11. 11. Lecture 1 Friday 25 April 2014 11 DRAWING INSTRUMENTS 2 A Series Formats (mm) A0 841 × 1189 A1 594 × 841 A2 420 × 594 A3 297 × 420 A4 210 × 297 A5 148 × 210 A6 105 × 148 A7 74 × 105 2. Drawing Sheets
    12. 12. Lecture 1 Friday 25 April 2014 12 DRAWING INSTRUMENTS 3 •Layout of a Drawing Sheet
    13. 13. Lecture 1 Friday 25 April 2014 13 • Tee square/ Drafting Machine DRAWING INSTRUMENTS 4
    14. 14. Lecture 1 Friday 25 April 2014 14 • Set squares (a pair) DRAWING INSTRUMENTS 5
    15. 15. Lecture 1 Friday 25 April 2014 15 • Irregular/ French curves DRAWING INSTRUMENTS 6
    16. 16. Lecture 1 Friday 25 April 2014 16 • Compasses • Divider • Protractor • Ruler/Scale • Pencil, Eraser DRAWING INSTRUMENTS 7
    17. 17. Lecture 1 Friday 25 April 2014 17 TYPES OF LINES • 3 Main Types DRAWING LINES 1
    18. 18. Lecture 1 Friday 25 April 2014 18 • Lines to aid understanding DRAWING LINES 2
    19. 19. Lecture 1 Friday 25 April 2014 19 DIMENSIONING 1 Dimension Lines (DL) Position of DL
    20. 20. Lecture 1 Friday 25 April 2014 20 DIMENSIONING 2 Alignment of DL DL of Small Features Dimensioning Angles Dimensioning Circles
    21. 21. Lecture 1 Friday 25 April 2014 21 DIMENSIONING 3
    22. 22. Lecture 1 Friday 25 April 2014 22 DIMENSIONING 4 Correct Practice of Dimensioning Drawing should only carry dimensions needed to manufacture
    23. 23. Lecture 1 Friday 25 April 2014 23 Reference Books • Technical Draughtsmanship By Eanna O’Broin • Engineering Drawing with Worked Examples By M.A. Parker & F. Pickup • Technical Drawing By F. E. Giesecke, A. Mitchell, H. C. Spencer, I. L. Hill, J. T. Dygdon, J. E. Novak
    24. 24. Lecture 1 Friday 25 April 2014 24 Assignment for Thursday! • Get your instruments sorted- buy them or borrow them

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