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Lecture 1 Wednesday 12 April 2023 1
ENGINEERING GRAPHICS1E7
Lecture 1: Introduction
Lecturer: Dr. Bidisha Ghosh ([email protected])
Course Structure
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
Time Table
Lecture 1 Wednesday 12 April 2023 5
Syllabus – Hand Drawing 1
• Basic Construction
• Orthographic Projections
• Isometric Projections
• Auxiliary Views
• Perspective : One-Point
• Perspective : Two-Point
Lecture 1 Wednesday 12 April 2023 6
Aim of the Course
• Knowledge of engineering drawing instruments
• Understanding and interpretation of technical drawings
• Ability to develop projections of a 3D object
Lecture 1 Wednesday 12 April 2023 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
Lecture 1 Wednesday 12 April 2023 8
WaterfallM. C. Escher
Technical drawing is the language of engineers and designers
Lecture 1 Wednesday 12 April 2023 9
Topics of Interest
•Drawing Instruments
•Lines
•Dimensioning
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1. Drawing Board
DRAWING INSTRUMENTS 1
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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
Lecture 1 Wednesday 12 April 2023 12
DRAWING INSTRUMENTS 3
•Layout of a Drawing Sheet
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• Tee square/ Drafting Machine
DRAWING INSTRUMENTS 4
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• Set squares (a pair)
DRAWING INSTRUMENTS 5
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• Irregular/ French curves
DRAWING INSTRUMENTS 6
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• Compasses
• Divider
• Protractor
• Ruler/Scale
• Pencil, Eraser
DRAWING INSTRUMENTS 7
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TYPES OF LINES
• 3 Main Types
DRAWING LINES 1
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• Lines to aid understanding
DRAWING LINES 2
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DIMENSIONING 1
Dimension Lines (DL)
Position of DL
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DIMENSIONING 2
Alignment of DL DL of Small Features
Dimensioning Angles Dimensioning Circles
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DIMENSIONING 3
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DIMENSIONING 4
Correct Practice of Dimensioning
Drawing should only carry dimensions needed to manufacture
Lecture 1 Wednesday 12 April 2023 23
Reference Books• Technical DraughtsmanshipBy Eanna O’Broin
• Engineering Drawing with Worked Examples
By M.A. Parker & F. Pickup
• Technical DrawingBy F. E. Giesecke, A. Mitchell,
H. C. Spencer, I. L. Hill, J. T. Dygdon, J. E. Novak
Lecture 1 Wednesday 12 April 2023 24
Assignment for Thursday!
• Get your instruments sorted- buy them
or borrow them