2.2 Computer Aided Drawing

• CAD software used in building drawing
• Setting up a CAD drawing environment on a digital device
• Drawing plane shapes using CAD software
• The importance of CAD in building drawing

• identify types of CAD software used in building drawing
• set up a CAD drawing environment on a digital device
• draw plane shapes using CAD software
• appreciate the importance of CAD in building drawing

“How important is CAD in building construction?”

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1. Computer Aided Drawing (CAD)
   40 min · 1 practice tasks · quiz
   What CAD is and the software used, how to set up a CAD drawing environment and draw plane shapes, and why CAD is so important in modern building construction.
2. CAD versus drawing by hand
   40 min · 1 practice tasks · quiz
   How CAD compares with instrument drawing on speed, accuracy, changes, storage and cost, using a Kenyan site change as the test.
3. CAD software for building drawing
   40 min · 1 practice tasks · quiz
   Types of CAD software used for building drawing in Kenya: 2D drafting, 3D modelling, and free school options.
4. Setting up CAD units, scale and limits
   40 min · 1 practice tasks · quiz
   How to start a new drawing, set millimetre units, choose a working scale and sheet limits, and save the file so a Kenyan plan prints at the right size.
5. Grid, snap and coordinates
   40 min · 1 practice tasks · quiz
   How the CAD X,Y grid, snap, ortho and typed coordinates place plane shapes at exact millimetres instead of by eye.
6. CAD layers
   40 min · 1 practice tasks · quiz
   What layers are, how to name them for a Kenyan house plan, and how colour, on/off and lock keep a drawing organised.
7. Drawing lines and rectangles in CAD
   40 min · 1 practice tasks · quiz
   Using LINE and RECTANGLE with typed millimetre sizes to draw rooms, slabs and wall outlines as plane shapes.
8. Drawing circles, arcs and polygons
   40 min · 1 practice tasks · quiz
   CIRCLE, ARC and POLYGON for columns, tanks, arches and manholes, still as plane shapes at exact millimetres.
9. Editing CAD drawings
   40 min · 1 practice tasks · quiz
   TRIM, COPY, MOVE, MIRROR and OFFSET so a plan can be changed without redrawing - the skill that makes CAD fast on Kenyan sites.
10. Dimensioning and text in CAD
    40 min · 1 practice tasks · quiz
    Adding millimetre dimensions and room names on the right layers so a Kenyan mason can build from the drawing.
11. Printing and plotting CAD drawings
    40 min · 1 practice tasks · quiz
    Moving from model space to a paper layout, choosing scale and sheet size, and plotting a PDF or print a Kenyan mason can use on site.
12. CAD for Kenyan site drawings
    40 min · 1 practice tasks · quiz
    Putting plane shapes, layers, dimensions and a plot together as a small house plan, and why CAD is an employable skill in Kenya.