Introduction to Engineering Introduction to CAD Agenda Introduction to Computer Aided Drafting Reference Design and 3-D Modeling IGCE – Chapter 6, pg The CADKEY Project Book, 5 th Edition- Chapter 1

Agenda Concepts of CAD Introduction to CADKEY; getting familiar with CADKEY user interface Creation of CADKEY Part file Creation of blank seed drawing Creation of title block pattern file

CAD – Computer Aided Design (and Drafting) CAD model is a computer representation of an object or part. It is a “virtual” part. The model is an engineering document of record. CAD programs are a means to develop a model, they include: Cadkey, AutoCad, ProEngineer, Solidworks and more.

Simplest model in CAD is 2-D Model Computer graphics equivalent to an orthographic projection created by hand.

2 ½ - D Model Third dimension by extrusion of 2-D  Not very useful, very limiting Extrude

3-D Model CAD software electronically stores the entire 3-D shape of the object. 3-D drawings can be generated from a 2- D model by the program

Example Wireframe 3-D Model

Example 3-D Surface Model

Solids Modeling Most sophisticated method – has volume as well as surfaces and edges

Working with CADKEY in the lab Save your work on your floppy or Zip disk  If the floppy disk is full, CADKEY does not warn while saving. It saves it as a 0 KB file. The file can no longer be used Follow the instructions in the project book in order. Don’t skip around; you may miss something important! Try to complete the assignments in class.

Specifics about how CADKEY works As set up for this class Color of line implies weight of line when printed (plotted) out. Conventions are:.75 mm Visible Green (#1) or Yellow (#4).35 mm Hidden or LetteringCyan (#5).35 mm CenterlinesMagenta (#6).35 mm Dimension & SectionMagenta (#6) Always, ALWAYS, print through PRINT PREVIEW Print black and white if on a printer outside of class.

Changing Print from portrait to landscape 1.File 2.Print/Plot Setup… 3.(choose orientation) Landscape OK Printing through Print/Preview 1.File 2.Print/Plot Preview… 3.Print Range (use default of all and one copy) OK 4.Cadkey Print/Plot Setup 5.Scale (10% smaller that default value; OK 6.Accept (to Autocenter) 7.Print Specifics about how CADKEY works

To configure computers outside classroom to print green & yellow lines.7mm thick and cyan & magenta lines.35mm thick: 1.Click on TOOLS OPTIONS PRINT 2. In dialog box, type.07 for green & yellow, and.035 for cyan & magenta 3. Click OK Specifics about how CADKEY works

Today’s Assignment: Work through Exercises of Chapter 1 The CADKEY User Interface Take each step in order. Do as much as you can today and finish tomorrow.