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

16. 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.