1. ENGINEERING GRAPHICS 1E9
Lecture 1: Introduction
Lecturer: Dr. Bidisha Ghosh

2. Course Structure Graphics CAE Hand Drawing (part 1) -Dr. B. Ghosh
Hand Drawing (part 2) -Dr. G. O’Donnell
Graphics
AutoCAD-Dr. S. Pavia
CAE

3. Assessment Examination: 75% 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. Ghosh : Sections A and B
Dr G. O’Donnell : Section C
Labs 25% - assessed by coursework
10 % AutoCAD
10% D.O. Tutorials Dr B. Gosh
5 % D.O. Assignment Dr G. O’Donnell

4. Time Table

5. Syllabus – Hand Drawing 1
Basic Construction
Orthographic Projections
Isometric Projections
Auxiliary Views
Perspective

6. Evaluation Examination (Sections A & B) Continuous Assessment
(2/3 of the total examination marks)
Continuous Assessment
(10% of the total course marks)
four drawing office tutorials

7. Aim of the Course Knowledge of engineering drawing instruments
Understanding and interpretation of technical drawings
Ability to develop projections of a 3D object

8. 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

9. Technical drawing is the language of engineers and designers
Waterfall
M. C. Escher

10. Topics of Interest Drawing Instruments Lines Dimensioning
Basic construction

11. Drawing Board DRAWING INSTRUMENTS 1
Layout of a typical drawing shet should be same as the background of this presentation. Nameplate at the bottom right corner.

12. Drawing Sheets A Series Formats (mm) A0 841 × 1189 A1 594 × 841 A2
DRAWING INSTRUMENTS
Drawing Sheets
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

13. Layout of a Drawing Sheet
DRAWING INSTRUMENTS
Layout of a Drawing Sheet
Layout of a typical drawing sheet

14. Tee square/ Drafting Machine
DRAWING INSTRUMENTS
Tee square/ Drafting Machine

15. DRAWING INSTRUMENTS
Set squares (a pair)

16. Irregular/ French curves
DRAWING INSTRUMENTS
Irregular/ French curves

17. Compasses Divider Protractor Ruler/Scale Pencil, Eraser
DRAWING INSTRUMENTS
Compasses
Divider
Protractor
Ruler/Scale
Pencil, Eraser

18. TYPES OF LINES 3 Main Types DRAWING LINES 1
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

19. Lines to aid understanding
DRAWING LINES
Lines to aid understanding

20. DIMENSIONING
Dimension Lines (DL)
Position of DL

21. Alignment of DL DL of Small Features Dimensioning Angles
Dimensioning Circles

22. DIMENSIONING

23. Correct Practice of Dimensioning
Drawing should only carry dimensions needed to manufacture

24. Drawing Parallel Lines
DRAWING LINES
Drawing Parallel Lines

25. Drawing Perpendicular Lines
DRAWING LINES
Drawing Perpendicular Lines

26. DRAWING LINES
Bisection of A Line
Place your compass point on A and stretch the compass MORE THAN half way to point B.
With this length, swing a large arc that will go BOTH above and below segment AB. 
Without changing the span on the compass, place the compass point on B and swing the arc again.  The new arc should intersect the previous one above and below the segment AB.
With your scale/ruler, connect the two points of intersection with a straight line.
This new straight line bisects segment AB.  Label the point where the new line and AB cross as C.
Segment AB has now been bisected and AC = CB. 
A B

27. Divide A Line into Multiple Sections
DRAWING LINES
Divide A Line into Multiple Sections
From one end of the given line AB (say, A) draw a line AC at a convenient angle
Using a scale/ruler divide the BC into the required number of parts making them of any suitable length.
Join the last point on line AC (say, C) to B
Draw construction lines through the other points on the line AB which are parallel to CB

28. DRAWING LINES
Bisection of An Angle
Place the point of the compass on the vertex of angle BAC (point A).
Stretch the compass to any length so long as it stays ON the angle.
Swing an arc with the pencil that crosses both sides of angle ABC.  This will create two intersection points (E and F) with the sides of the angle.
Place the compass point on E, stretch your compass to a sufficient length and draw another arc inside the angle - you do not need to cross the sides of the angle.
Without changing the width of the compass, place the point of the compass on F and make a similar arc.  These two small arcs in the interior of the angle should be crossing each other.
Connect the point of intersection of the two small arcs to the vertex A of the angle with a straight line.

29. Find the Centre of an Arc
DRAWING LINES
Find the Centre of an Arc
Select three points A, B and C on the arc and join AB and BC
Bisect AB and BC.
Fine the intersection point of the bisecting lines/bisectors. That is the centre of the arc.

30. Inscribe a Circle in a Triangle
DRAWING LINES
Inscribe a Circle in a Triangle
Bisect angle ABC and angle BAC.
Fine the intersection point of the bisecting lines/bisectors. That is the centre of the circle.
The radius of the circle is the length of a perpendicular line on any of the sides of the triangle drawn from the centre of the circle.

31. Circumscribe a Circle on a Triangle
DRAWING LINES
Circumscribe a Circle on a Triangle
Bisect sides AC and BC.
Fine the intersection point of the bisecting lines/bisectors. That is the centre of the circle.
The radius of the circle is the length of a line joining any one of the vertices of the triangle to the centre of the circle.

32. Notes for Tutorials
The tutorials start next Monday in drawing office in museum building
Each tutorial is worth 2.5%
Bring your own drawing instruments
Drawing sheets will be provided
Students will not be allowed in the tutorial without instruments