1. Introduction to AutoCAD
Dr. G. Karuppusami
(Contributions from Dr. Raddy and
Prof. Farooq are acknowledged with thanks)

2. Graph the following points and join them with lines
Absolute X Y 1 30 20 2
-20 3 4
-50 5
-30 6 50 7
-10 8

3. Exercise on Graph sheet

4. What is AutoCAD? CAD – Computer Aided Design/Drafting
AutoCAD is a Computer Aided Drafting program used by every Engineering and Design office in the world
Mechanical and Electrical Engineers
Civil Engineers
Architects
Aeronautical Engineers plus many other disciplines

5. What is AutoCAD?
Accurate drawings can be created and published using AutoCAD’s powerful features
3D 'models' can also be created giving the designer absolute control over the design from start to finish
An object can be rendered on screen to give an idea of the finished Product

8. Entering Points in AutoCAD
Absolute Coordinates
Relative Rectangular Coordinates
Relative Polar Coordinates

9. RELATIVE RECTANGULAR COORDINATE
A RELATIVE RECTANGULAR COORDINATE allows you to specify a position along the X-axis, Y-axis, and Z-axis (if needed) to locate a point relative to the last point you specified.
To locate a point using the Relative Rectangular Coordinate system, and then the X-value, Y-value, and, if needed, the Z-value, separated by commas and no spaces.

10. RELATIVE RECTANGULAR COORDINATE
If your last point was at 12,8 (see FIGURE below), you can and AutoCAD will locate an entity or point 11 along the x axis and 7 along the y axis from the 12,8 point.

11. Absolute and Relative co-ordinates
Points
Absolute X Y
Relative 1 30 20 2
-20
-50 3 4
-30 5 6 50
100 7
-10 8

12. RELATIVE POLAR COODINATES
RELATIVE POLAR COODINATES allow you to select a point that is a specific length and at a specific angle to the last point indicated.
To locate a point using a Relative Polar Coordinate: the length of the line, more than symbol (< ) followed by the desired angle of the line. DO NOT add spaces between the line length value, the < symbol, and the angle value. (SEE EXAMPLES BELOW)

13. RELATIVE POLAR COODINATES
Example: 1
If you are in the Line command and AutoCAD selects a point that is 11mm long and at a 45 degree angle from the last point given.

14. RELATIVE POLAR COODINATES
Example: 2 If you are in the Line command and AutoCAD selects a point that is 8 mm long and at a negative 45 degree angle from the last point given.

15. Steps for Creating a Template for drawing
Step#1 Setting Limits
Step#2 Setting Units
Step#3 Setting Text Style & Size
Step#4 Setting Grid and Snap
Step#5 Drawing Border Lines & Title Block
Step#6 Add Text to The Title Block
Step#7 Save your Template Drawing

16. The AutoCAD Screen Components

17. Invoking Commands in AutoCAD
Through TYPED commands
Through Pull-down Menus
Through TOOL Bars
Standard Toolbar - Dimension –Draw - Modify - Object Properties – Object Snap

18. AutoCAD's Coordinate systems
Linear Measurement
WCS: World Coordinate System

19. AutoCAD's Coordinate systems
Angular Measurement

20. Starting ACAD 2D Drawing
Click the ‘Workspaces toolbar’ located just below ‘File’ menu and
Set to ‘2D Drafting & Annotation’

21. Starting ACAD

22. Template Exercise – A3 Sheet

23. THANK YOU