Introduction to Engineering Introduction to CAD

1
Introduction to EngineeringIntroduction to CAD

• Agenda
• Introduction to Computer Aided Drafting
• Reference
• Design and 3-D Modeling
• IGCE Chapter 6, pg 159 - 169
• The CADKEY Project Book, 5th Edition- Chapter 1

2
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

3
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.

4
Simplest model in CAD is 2-D Model

• Computer graphics equivalent to an orthographic
  projection created by hand.

5
2 ½ - D Model

• Third dimension by extrusion of 2-D
• Not very useful, very limiting

6
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

7
Example Wireframe 3-D Model
8
Example 3-D Surface Model
9
Solids Modeling

• Most sophisticated method has volume as well as
  surfaces and edges

10
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.
• Dont skip around you may miss something
  important!
• Try to complete the assignments in class.

11
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 Lettering Cyan (5)
• .35 mm Centerlines Magenta (6)
• .35 mm Dimension Section Magenta (6)
• Always, ALWAYS, print through PRINT PREVIEW
• Print black and white if on a printer outside of
  class.

12
Specifics about how CADKEY works

• Changing Print from portrait to landscape
• File
• Print/Plot Setup
• (choose orientation) Landscape OK
• Printing through Print/Preview
• File
• Print/Plot Preview
• Print Range (use default of all and one copy)
  OK
• Cadkey Print/Plot Setup
• Scale (10 smaller that default value OK
• Accept (to Autocenter)
• Print

13
Specifics about how CADKEY works

• To configure computers outside classroom to print
  green yellow lines .7mm thick and cyan
  magenta lines .35mm thick
• Click on TOOLS OPTIONS PRINT
• In dialog box, type .07 for green yellow, and
  .035 for cyan magenta
• Click OK

14
Todays 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.