Introducing AutoCad

CAM  Computer-Aided Manufacturing: Utilizing graphics data in automated fabrication of the parts:  CNC Machining (Computerized Numerical Control)  Rapid Prototyping and Manufacturing STL file (Stereolithography)

CAE  Computer-Aided Engineering: Study of an engineering event using computer based analysis tools:   Study of a manufacturing process to be used in optimized part (product), process, and tooling design.  safety/pam-crash safety/pam-crash  Virtual Performance for Crash & Safety Professionals

CIM  Computer-Integrated Manufacturing:  Entire manufacturing enterprise is tied by a computer system including purchasing ….. shipping.  More on the Control Sense. But it is Virtual Simulation.

History  Earlier, it was paper based. Many instruments were utilized.  Drafting Board, T-Square, Triangle Rulers, Protractors, Compass  Before the advent of the computers, it was utilized in engineering problem solving.  For example: Electrical Circuits  Development of computer technology led to development of computer graphics.  USAF radar image recognition and manipulation system with light pen input followed by  Graphic Editors similar to Paint or MSWord Graphics features

History  Additional tools such as Graphics Tablets with graphic functions and manipulation ability enhanced the capabilities.  Early CAD programs were 2D with mainly drafting ability and 3D Wireframes  Solid Modelers opening a new door to tie various stages of Engineering Design and Development process as shown before in this introduction. (Inventor and Solidworks) SO NOW WE HAVE SOFTARE LIKE AUTOCAD

Drawing Sizes

 Any object can be viewed from six mutually perpendicular views  These views are called principal views and are arranged in a standard way * Modern Graphics Communication, 4 th edition, Giesecke, Mitchell, Spencer, Hill, Dygdon, Novak, Lockhart Publisher: Prentice Hall Copyright: 2010

Sample Drawing

15 Source: College of Engineering, Ohio State Universityhttp://feh.eng.ohio-state.edu/Lectures/191au04/09-30%20Lecture%202%20-%

 2D Wireframe: Displays the objects using lines and curves to represent the boundaries.  3D Wireframe: (lower right) Displays the objects using lines and curves to represent the boundaries. Using a wire frame model allows visualization of the underlying design structure of a 3D model.

 3D Hidden (lower left): Displays the objects using 3D wireframe representation and hides lines representing back faces.  Realistic (lower right): Shades the objects and smooths the edges between polygon faces. Materials that you have attached to the objects are displayed.

 Conceptual: Shades the objects and smooths the edges between polygon faces. Shading uses the Gooch face style, a transition between cool and warm colors rather than dark to light. The effect is less realistic, but it can make the details of the model easier to see.

 3D Surface Modeling don’t have density and are merely joined surfaces.  Solid models have density and are not merely joined surfaces.  Models are created by joining together or unioning basic primitive shapes: Box, Sphere, Cylinder, Cone, Wedge, Torus etc. and by polyline etc.

 This command is used to extend the existing 2D shapes into 3D shapes. This command can be applied only to a polyline.

 The REVOLVE command creates 3D solids by revolving closed polylines, circles, ellipses, closed splines, or regions about an axis in 3D space.

 UNION command is used to combine objects.  SUBTRACT command is used to remove objects.

 ACAD is free to download at your home. Please see the link for the registration and downloads. In today’s class we will just understand the basics.