Autocad 2008 Tutorial (3D Modeling)

AutoCAD® 2008 Tutorial Second Level: 3D Modeling

Randy H. Shih

Oregon Institute of Technology

SDC

PUBLICATIONS

Schroff Development Corporation www.schroff.com www.schroff-europe.com

AutoCAD® 2008 Tutorial: 3D Modeling

Table of Contents Preface Acknowledgments Chapter 1

Getting Started Introduction Development of Computer Geometric Modeling Why use AutoCAD® 2008? Getting Started with AutoCAD® 2008 AutoCAD Screen Layout 3D Modeling WorkSpace Pull-down Menus Standard Toolbar Graphics Window Graphics Cursor or Crosshairs Command Prompt Area Cursor Coordinate or Single Line Help Display Status Toolbar Dashboard Panels 3D Modeling and Editing Toolbar Panel Layers Control Toolbar Panel Visual Styles Toolbar Panel Mouse Buttons [Esc] - Canceling commands On-Line Help Leaving AutoCAD Creating a CAD files folder

1-2 1-2 1-5 1-7 1-8 1-9 1-10 1-10 1-10 1-10 1-10 1-10 1-10 1-11 1-11 1-11 1-11 1-12 1-12 1-13 1-14 1-15

Chapter 2

User Coordinate System and the Z-Axis Introduction The Floor Plan design Starting up AutoCAD 3D modeling WorkSpace Drawing Units Setup Drawing Area Setup GRID and SNAP intervals Setup Drawing and Modify Toolbars Drawing Polylines Creating an offset polyline Creating interior walls

2-2 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11

iii

iv

AutoCAD® 2008 Tutorial: 3D Modeling

Completing the doorway using the TRIM command User Coordinate System – It is an XY CRT, but an XYZ World Viewing the 2D Design in 3D space Adding the 3rd dimension to the Floor Plan Design Viewing the design using the Hide option Adding New Layers Moving entities to a different layer Moving the UCS Creating the roof Rotating the UCS Sketching on the Rotated UCS Viewing the design using the Hidden option Questions Exercises

2-14 2-16 2-17 2-18 2-20 2-21 2-22 2-22 2-24 2-26 2-27 2-28 2-29 2-30

Chapter 3

3D Wireframe Modeling Introduction The LOCATOR Design Starting up AutoCAD Using the Startup Options Creating the rectangular base of the design Create a 3D box Object Snap Toolbar Using the Snap options to locate the top corners Using the Copy option to create additional edges Using the TRIM Command Using the View Toolbar Dynamic Rotation – Free orbit Using the OFFSET command to create parallel edges Creating a circle above the UCS sketch plane Completing the wireframe model Questions Exercises

3-2 3-3 3-4 3-4 3-6 3-7 3-10 3-10 3-12 3-14 3-16 3-16 3-17 3-19 3-20 3-22 3-23

Chapter 4

UCS, Viewports and Wireframe Modeling Introduction The V-BLOCK design Starting Up AutoCAD Layers setup Creating the rectangular base of the design

4-2 4-2 4-3 4-4 4-5

Table of Contents

Creating a wireframe Box Using the View and the UCS Toolbars Creating construction lines in the front view Copying in the negative Z direction Creating an Inclined Line at the Base of the Model Creating object lines Multiple Viewports Using the MIRROR command Turn OFF the Construction Lines Creating a NEW UCS Creating a New Named View Creating the V-Cut feature on the inclined plane Extend the Cut and GRIP Editing Questions Exercises

4-6 4-7 4-8 4-10 4-11 4-12 4-14 4-15 4-17 4-18 4-20 4-22 4-23 4-25 4-26

Chapter 5

3D Surface Modeling Introduction Starting up AutoCAD Using the UCS and Surfaces Toolbars Creating a surface using the 2D SOLID command Using the Visual Styles Toolbar Creating a surface using the 3D FACE command Creating a surface of irregular shape Using the Invisible Edge option Moving with the Grip Editing Tools The LOCATOR wireframe model Moving Objects to a different Layer Advanced Surface Modeling commands Using the Tabulated Surface option Using the Ruled Surface option Questions Exercises

5-2 5-4 5-5 5-5 5-8 5-10 5-12 5-14 5-15 5-16 5-16 5-18 5-20 5-22 5-25 5-26

Chapter 6

Solid Modeling - Constructive Solid Geometry Introduction The GUIDE-BLOCK Design Constructive Solid Geometry Concept Binary Tree The GUIDE-BLOCK CSG Binary Tree

6-2 6-2 6-3 6-4 6-5

v

vi

AutoCAD® 2008 Tutorial: 3D Modeling

Starting Up AutoCAD® 2008 Creating the First 3-D object Viewing the 3-D Block Creating the Second Solid Feature Boolean Operation - UNION Creating the Second Cylinder Feature Boolean Operation - SUBTRACT Creating another Solid Feature Visual Styles Options Creating the Final Feature Rotating the Rectangular Block Moving the Rectangular Block Questions Exercises

6-6 6-7 6-8 6-9 6-10 6-11 6-12 6-13 6-14 6-15 6-16 6-17 6-18 6-19

Chapter 7

Regions, Extrude and Solid Modeling Introduction The V-BLOCK design Starting Up AutoCAD Layers setup Setting up a 2D sketch Defining the Front edges of the design Creating a Region Modeling Toolbar Creating a 2D sketch at the Base of the Model Creating a Copy of the 2D sketch Creating the cutter solids Boolean operation - Subtract Mass properties of the solid model Align the UCS to the inclined face Creating the V-cut Questions Exercises

7-2 7-2 7-3 7-4 7-5 7-7 7-10 7-11 7-13 7-14 7-15 7-16 7-17 7-18 7-19 7-22 7-23

Chapter 8

Multiview Drawings From 3D Models Introduction The V-BLOCK design Starting Up AutoCAD AutoCAD Paper Space Deleting the displayed viewport

8-2 8-2 8-3 8-4 8-5

Table of Contents

Adding borders and title block in the layout Setting up Viewports inside the Titleblock Setting up the standard views Determining the necessary 2D views Establishing an auxiliary view in Model Mode Adding a viewport for an Auxiliary view Using the DVIEW command Adjusting the Viewport Scale Locking the Base view Aligning the 2D views Creating 2D projected entities - SOLPROF Completing the 2D drawing Questions Exercises

8-6 8-7 8-8 8-10 8-11 8-13 8-16 8-17 8-18 8-18 8-21 8-23 8-25 8-26

Chapter 9

Symmetrical Features in Designs Introduction A Revolved Design: PULLEY Modeling Strategy - A Revolved Design Starting Up AutoCAD Layers Setup Setting up a 2D sketch for the Revolved feature Perform 2D Boolean Operations

Creating the Revolved Feature Mirroring Part Combining Parts 3D Array Position and perform the Cut Questions Exercises

9-2 9-2 9-3 9-4 9-5 9-6 9-8 9-12 9-13 9-14 9-15 9-18 9-20 9-21

Chapter 10

Advanced Modeling Tools & Techniques Introduction A Thin-walled Design: OIL SINK Modeling Strategy Starting Up AutoCAD Layers Setup The First Extruded Feature Create an Offset geometry from an Extracted surface Extrude with Draft Angle

10-2 10-2 10-3 10-4 10-5 10-6 10-8 10-10

vii

viii

AutoCAD® 2008 Tutorial: 3D Modeling

Aligning the parts Create another Extracted Surface Combining parts – Boolean UNION Creating 3D Rounds and Fillets Creating a Shell Feature Creating a Rectangular Array Cut feature Creating Another Rectangular Array cut feature Making A Design Change Grip Editing Approach Dynamic UCS Approach Questions Exercises

10-11 10-12 10-15 10-16 10-18 10-19 10-21 10-23 10-23 10-25 10-27 10-28

Chapter 11

Conceptual Design Tools & Techniques Introduction A BIRDHOUSE Design Starting Up AutoCAD Layers Setup The Base Plate Create the 1st floor inside compartments Create a solid feature Using the PressPull command Using the PressPull command as an Editing Tool Create another Cut feature Adjusting the Compartments Adding additional Compartments Creating the Doors Creating the 2nd Floor Repositioning the 2nd Floor Modeling the Roof Section with the PressPull command Using the Imprint command Conclusion Questions Exercises

Index

11-2 11-3 11-4 11-5 11-6 11-7 11-8 11-10 11-11 11-13 11-14 11-15 11-16 11-18 11-19 11-21 11-23 11-24 11-25