Class11_2 Today’s topics: More on AutoCAD

DP…questions?

Reminder: Testing Your design report requires test results. Testing should be systematic and based on a clear plan. Result should be recorded and evaluated, and should be connected to how the results were used to improve the design.

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

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

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.

AutoCAD Ways to specify coordinate points: –Pick (interactive with mouse) –Absolute X,Y –Relative –Relative –Direct distance

AutoCAD Modify commands Selection sets Oops Undo

AutoCAD Setting up drawings Limits Zoom window, zoom previous Zoom all

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

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

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.

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.

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

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

More AutoCAD functionality Modify command: Trim Recall: circles can be drawn (TTR)

Exercise Draw bottom item on handout Do not include dimensions Be sure to set up your layers first If you already know how to do this, help a person sitting near you.