introduction to engineering graphics
TRANSCRIPT
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