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Class12_1

Class12_1. Today’s topics: More on AutoCAD, dimensioning Reminders: Design demo in 2 weeks Exam in 2.5 weeks. DP…questions?. Exam. Old exams are posted on the class website. Format and scope will be the same. CAD. Bottom line….

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Class12_1

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  1. Class12_1 Today’s topics: • More on AutoCAD, dimensioning • Reminders: • Design demo in 2 weeks • Exam in 2.5 weeks

  2. DP…questions?

  3. Exam • Old exams are posted on the class website. Format and scope will be the same.

  4. 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.

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

  6. 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

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

  8. 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.

  9. More AutoCAD functionality • LTSCALE • Layer properties (setting, by layer, override) • Change properties • Lineweight

  10. Adding text to your drawing • Text is an object, so can be moved, rotated, copied, etc. • Need to specify the height of the characters so that they are suitable for your drawing • Can define several text “styles” to make drawing text easier, command line “style” • A spell checker is available, separately • Edit using “modify, text”

  11. Dimensioning • Semi-automatic • Opening a dimensioning toolbar • Setting dimensioning variables: “Format/dimension style”

  12. You are the engineer! • You need to know the proper dimensioning conventions.

  13. Exercise 5 • Please draw and dimension the object on the bottom of the handout. • Set drawing limits! • Set up layers! • Use construction lines! • Dimension correctly

  14. Exercise 6 • Please draw and dimension the object on the next slide. • Draw 3 views. • Set drawing limits! • Set up layers! • Use construction lines! • Dimension correctly

  15. Your drawing assignment Draw a three-view orthographic projection of your device. Dimension completely. Your goal should be to provide enough information so that someone can build your device. Due as part of the Final Report.

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