introduction to engineering graphics and instruments used

1. Engineering graphics

2. Contents
• Introduction to drawing
• Orthographic projection
• Isometric projection
• Building drawing
• Building by laws and standard norms
• Development of a line plan of a building

3. 1.Introduction to Drawing
• What is engineering drawing?
Engineering drawing is language of an engineer

4. Effectiveness of graphics language
Try to write a description of this object
Tell your friend to draw the
Same figure with the help of
Your description.
You can easily understand that…………
By words you cant explain an object exactly in
terms of size and shape.

5. Introduction
• An engineering drawing is a type of technical
drawing ,which says clearly about all the data
necessary for constructing/manufacturing the
engineering object, e.g. building ,machine and
machine components etc.

6. 1.1 Drawing instruments
1.Drawing boards and drawing table
2.T square 17.Drawing pins ,clips or adhesive tape
3.Set square 18.Paper box
4.Protractor
5.Scale
6.Roll N draw
7.Mini drafter
8.Drawing instrument box
9.Drawing Paper
10.French curves
11.Templates
12.Drawing paper
13.Drawing pencils
14.Pencil sharpener
15.Eraser
16.Duster

7. Drawing board and drawing table
Drawing table
Drawing board

8. Size of drawing board
Designation Size(mm) Name
B0 1500*1000 Antiquarian
B1 1000*700 Double elephant
B2 700*500 Imperial
B3 500*350 Half imperial

9. T-square
1.T SQYARE IS THE INSTUMENTS USED FOR
DRAWING EXACT PERPENDICULAR LINES
2.IT IS ALSO USED FOR DRAWING HORIZONTAL
LINES

10. Mini drafter
1.The most commonly used drawing instrument.
2.horizontal,verical and inclined parallel lines of desired
length can b e drawn anywhere on the drawing sheet.

11. Drawing instrument box

12. Drawing papers
different sizes of drawing papers
Sr.
no.
Designation Length(mm) Width(mm)
1. A0 1189 841
2. A1 841 594
3. A2 594 420
4. A3 420 297
5. A4 297 210
6. A5 210 148

13. Surface area of A0 size is one square meter. Successive format sizes e.g.(A1,A2) are obtained by
halving along the length. The areas of two sizes are in ratio of 1:2

14. French curves
• French curves are used for drawing smooth
curved lines that are not arcs or circles ,such
as ellipses, parabolas and spirals.
• The French curve is used to draw a smooth
line through predetermined points.

15. H pencils
Are
Mostly used
For drawing
Dark lines
4 H pencils are used for drawing projections