introduction to engineering graphics

Engineering graphics

Contents

• Introduction to drawing

• Orthographic projection

• Isometric projection

• Building drawing

• Building by laws and standard norms

• Development of a line plan of a building

1.Introduction to Drawing

• What is engineering drawing?

Engineering drawing is language of an engineer

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.

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.

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

Drawing board and drawing table

Drawing table

Drawing board

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

T-square

1.T SQYARE IS THE INSTUMENTS USED FOR DRAWING EXACT PERPENDICULAR LINES

2.IT IS ALSO USED FOR DRAWING HORIZONTAL LINES

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.

Drawing instrument box

Drawing papersdifferent 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

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

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.

Drawing pencil

H pencils AreMostly used For drawing Dark lines

4 H pencils are used for drawing projections