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Learning Technical Drawing with CAD: Understanding the Basics

Learn about CAD functionality, drawing techniques, and AutoCAD usage in technical drawing. Get insights on creating accurate drawings, utilizing commands efficiently, and setting up drawings. Practice exercises included!

natalya-penda
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Learning Technical Drawing with CAD: Understanding the Basics

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  1. Class11_1 Today: • Technical drawing using CAD

  2. DP…questions?

  3. Reminders: Dates Design demonstration is 3.5 weeks from today. It goes fast! Remember advice of previous classes: “Leave lots of time for testing.” Questions?

  4. CAD • CAD is a tool to help you make technical drawings; you must make the drawings • Using CAD is not the same as doing design

  5. CAD • Can be highly accurate • Allows easy repetition and revision • Provides input to other analyses and manufacturing programs

  6. CAD • Drawings are full scale (true size units) • Objects (such as lines) have numerically defined properties, such as end-point coordinates

  7. CAD • The drawing is more than its appearance—it is a numerical description of the geometry (example: lines do not just appear to connect, they share the same end point coordinates)

  8. CAD Bottom line…. A CAD file is a NUMERICAL DATABASE describing your part. It is not a picture. Need to adopt this mindset when making a CAD drawing.

  9. AutoCAD • New users beware: in AutoCAD there are usually about 5 ways to accomplish the same thing; this can be confusing at first • Tip: learn to use the command line and depend less on the mouse • Tip: read the help files because there are lots of details and tricks to learn

  10. Let’s take a look at AutoCAD • Graphics area • Command line • Toolbars • Pull down menus • Dialog boxes • Status bar and drawing aids • Model vs. layout space

  11. AutoCAD • The free student version is available from Autodesk • We will use the AutoCAD Classic interface.

  12. AutoCAD • Draw commands • Draw commands create objects • Remember: you are creating a numeric object, not just lines on a screen… • Many ways to accomplish the same thing

  13. AutoCAD • Help files • Spacebar same as enter • Hit ESC to cancel current command • Drawing aid: ortho

  14. AutoCAD • Ways to specify coordinate points: • Pick (interactive with mouse) • Absolute X,Y • Relative rectangular @X,Y • Relative polar @distance<angle • Direct distance

  15. Exercise 1 • Draw the following lines using the procedure suggested…

  16. Circles and Arcs • Can be drawn with a variety of options • Notice the use of the Command Line • Examples • Center, radius • Center, diameter • Two points • Tangent, tangent, radius

  17. AutoCAD • Modify commands • Selection sets • Oops • Undo

  18. Exercise 2 • Draw a bunch of circles • Try selection set methods • Experiment with Erase • Remember: use Esc to abort a command • Experiment with Oops and Undo

  19. AutoCAD • Setting up drawings • Limits • Zoom window, zoom previous • Zoom all

  20. Drawing aids • ORTHO to restrict only horz/vert lines • OBJECT SNAP enables the cursor to “snap” to existing object features, such as end points • Types of object features to snap to • Running OSNAP • Command line OSNAP

  21. More AutoCAD functionality • Construction line type • More Modify commands: Fillet, Offset • More Modify commands: Mirror

  22. Exercise • Draw top item on the handout • Do not include dimensions • If you already know how to do this, help a person sitting near you.

  23. More AutoCAD: Layers • Layers • Tip: the availability of layers is a great feature of CAD…learn to use layers effectively (use lots of them) • Do not draw on the 0 layer or the defpoints layers. These have special properties and should be reserved for that use.

  24. Example of using layers • Set up layers in preparation for drawing Layers: • Part, black, continuous • Construction, light grey, continuous • Center line, black, centerline style

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