1. COMPUTER- AIDED DRAFTING (CAD)

2. DRAFTING The process of representing three- dimensional objects in two-dimensions. The language of industry.

3. CAD ADVANTAGES Faster More accurate Neater

4. CAD SYSTEM COMPONENTS

5. HARDWARE Fast, powerful computer Input devices Monitor Plotters

6. SOFTWARE CAD programs – some are easy to use, others are difficult to use. Make sure that it has all the features you’ll need. Make sure that it’ll work with your hardware.

7. CARTESIAN COORDINATE SYSTEM

8. A system that allows you to plot points on a drawing. Based on an imaginary grid.

9. X axis plots width Y axis plots height Z axis shows depth on 3D drawings

10. Origin : point where X and Y axes meet (=0) Coordinate pair : set of two numbers that locate a point on the grid (X,Y)

11. TWO-DIMENSIONAL AND THREE-DIMENSIONAL CAD DRAWINGS

12. 2D DRAWINGS width and length; width and height; or length and height

13. 3D DRAWINGS Add depth (Z axis) to a 2D drawing

14. Wireframe drawings : look like wire sculptures.

15. Surface models: show solids instead of just lines

16. Solid models : so realistic that they resemble a photograph or the work of a skilled artist.

17. CATEGORIES OF CAD COMMANDS

18. DRAWING Used to create lines, circles, and other geometric shapes. (object/entity) – LINE – CIRCLE – ARC – TEXT – DIMENSIONING

19. EDITING Used to make changes on drawings. – ERASE – MOVE – COPY – ROTATE – MIRROR

20. UTILITY ZOOM PLAN PLOT