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Class11_1

Class11_1. Today: Technical drawing using CAD. DP…questions?. 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?. CAD.

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Class11_1

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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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