1. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 1 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege.edu Engineering 22 Surface Modeling - 1

2. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 2 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Learning Goals  Use AutoCAD Built-In Commands to make “Primitive” 3D Surface-Shapes Box, Sphere, Cone, Pyramid, others  Draw Surface of Revolution using a Shape & Axis  Connect two Shapes with Straight Lines to Make “Ruled” Surfaces  Build Complex 3D Shapes by Adding & Subtracting Primitives

3. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 3 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Invoke Surface-Shapes Surfaces ToolBar  Or Command Line ai_XXX –XXX = box, wedge, pyramid, cone, etc.

4. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 4 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Draw Box  Pick Length & Width Using Ortho-Snap and Mouse  Specify Height from KeyBoard  “ENTER” To NOT Rotate Command: _ai_box Specify corner point of box: Specify length of box: Specify width of box or [Cube]: Specify height of box: 7 Specify rotation angle of box about the Z axis or [Reference]:

5. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 5 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Draw Wedge  Add to End of Box  Pick Length Using Ortho-Snap and Mouse  Pick Width and Height using END Option to Pick Box Corners  “ENTER” To NOT Rotate Command: ai_wedge Specify corner point of wedge: >> Specify corner point of wedge: end of Specify length of wedge: Specify width of wedge: end of Specify height of wedge: end of Specify rotation angle of wedge about the Z axis:

6. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 6 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Draw Rect-Base Pyramid  Enter Pts From KeyBd  Pyramid Apex OffCenter from base Command: ai_pyramid Specify first corner point for base of pyramid: Specify second corner point for base of pyramid: 11,0 Specify third corner point for base of pyramid: 11,7 Specify fourth corner point for base of pyramid or [Tetrahedron]: 0,7 Specify apex point of pyramid or [Ridge/Top]: 7,5,9

7. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 7 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Draw Triangle-Base Pyramid  Triangle Pyramid → a TETRAHEDRON  Enter Pts From KeyBd Command: _ai_pyramid Initializing... 3D Objects loaded. Specify first corner point for base of pyramid: 0,0 Specify second corner point for base of pyramid: 8,2 Specify third corner point for base of pyramid: 2,8 Specify fourth corner point for base of pyramid or [Tetrahedron]: t

8. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 8 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Draw Ridged Pyramid  Base & 2-Sides → Quadrilaterals  Ends → Triangles  Enter Pts From KeyBd Command: ai_pyramid Specify first corner point for base of pyramid: 0,0 Specify second corner point for base of pyramid: 10,0 Specify third corner point for base of pyramid: 10,10 Specify fourth corner point for base of pyramid or [Tetrahedron]: 0,10 Specify apex point of pyramid or [Ridge/Top]: R Specify first ridge end point of pyramid: 3,5,10 Specify second ridge end point of pyramid: 7,5,7

9. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 9 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Draw Truncated Cone  Enter Pts From KeyBd  Could Also make Full Cone by Setting Top-Radius to ZERO Command: _AI_CONE Specify center point for base of cone: 5,5 Specify radius for base of cone or [Diameter]: 6 Specify radius for top of cone or [Diameter] : 3 Specify height of cone: 8.7 Enter number of segments for surface of cone :

10. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 10 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Draw Dish  Enter Pts From KeyBd  This is a SEMIsphere; Could Also make Full Sphere HEMIsphere (dome) Command: _ai_dish Specify center point of dish: 5,5 Specify radius of dish or [Diameter]: 8.8 Enter number of longitudinal segments for surface of dish : 17 Enter number of latitudinal segments for surface of dish : 11

11. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 11 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Draw 3D Face  3DFaces are flat surfaces with 3 or 4 straight edges. Command: _3dface Specify first point or [Invisible]: 0,0 Specify second point or [Invisible]: 10,0 Specify third point or [Invisible] : 10,10 Specify fourth point or [Invisible] : 0,10 Specify third point or [Invisible] : 0,10,5 Specify fourth point or [Invisible] : 10,10,5 Specify third point or [Invisible] : 10,15,5 Specify fourth point or [Invisible] : 0,15,5 Specify third point or [Invisible] :

12. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 12 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Revolved Surface  The REVSURF command creates a surface, based on the revolution of a curve about an axis.  The curve can be a line, spline, polyline, arc, circle, ellipse, or elliptical arc.  SURFTAB1 and SURFTAB2 system variables control the number of divisions in the final 3D mesh

13. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 13 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics RevSurf Example Axis of Revolution Form to Revolve  Make Bowl with a Nice Base by Revolving a Closed-Form About a Vertical Axis

14. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 14 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Set SHADING & SurfTab  Increase the WireFrame Density Command: surftab1 Enter new value for SURFTAB1 <6>: 36

15. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 15 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Turn into ONE Object Command: pedit Select polyline or [Multiple]: Object selected is not a polyline Do you want to turn it into one? y Enter an option [Close/Join/Width/Edit vertex/Fit/Spline/Decurve/Ltype gen/Undo]: j Select objects: 1 found Select objects: 1 found, 2 total Select objects: 1 found, 3 total Select objects: 1 found, 4 total Select objects: Specify opposite corner: 0 found Select objects: 1 found, 5 total Select objects: 1 found, 6 total Select objects: 1 found, 7 total Select objects: 1 found, 8 total Select objects: 1 found, 9 total Select objects: 1 found, 10 total Select objects: 1 found, 11 total Select objects: 1 found, 12 total Select objects: 1 found, 13 total Select objects: 1 found, 14 total Select objects: 1 found, 15 total Select objects: 14 segments added to polyline Enter an option [Open/Join/Width/Edit vertex/Fit/Spline/Decurve/Ltype gen/Undo]:

16. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 16 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Change to IsoMetric View

17. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 17 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Invoke RevSurf Select object to revolve: Select object that defines the axis of revolution: Specify start angle : Specify included angle (+=ccw, -=cw) : Object to Revolve Object that defines the axis of Revolution

18. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 18 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Increase SurfTab2 Resolution Command: surftab2 Enter new value for SURFTAB2 : 12 Command: Command: _revsurf Current wire frame density: SURFTAB1=36 SURFTAB2=12 Select object to revolve: Select object that defines the axis of revolution: Specify start angle :

19. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 19 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics SurfTab Comparison  SurfTab2 = 6  SurfTab2 = 12

20. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 20 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Tabulated & Ruled Surfaces  Set Up: Shade Mode → Gouraud Shaded, Edges on SurfTab1 Value → 8 Command: _shademode Current mode: Gouraud+Edges Enter option [2D wireframe/3D wireframe/Hidden/Flat/Gouraud/fLat+edges/gOuraud+edges] <Gouraud+Edges>: _o Command: _shademode Current mode: Gouraud+Edges Enter option [2D wireframe/3D wireframe/Hidden/Flat/Gouraud/fLat+edges/gOuraud+edges] <Gouraud+Edges>: _o Command: surftab1 Enter new value for SURFTAB1 <6>: 8

21. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 21 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Invoke TabSurf Command: _tabsurf Current wire frame density: SURFTAB1=8 Select object for path curve: Select object for direction vector: Object for Path Curve Object for Direction Vector Surface is Quite COARSE → Change Resolution

22. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 22 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Increase SurfTab1 Resolution Command: surftab1 Enter new value for SURFTAB1 <8>: 36 Command: _tabsurf Current wire frame density: SURFTAB1=36 Select object for path curve: Select object for direction vector: Looks Much Better

23. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 23 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics RuleSurf on Ellipses

24. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 24 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Invoke RuleSurf Command: _rulesurf Current wire frame density: SURFTAB1=36 Select first defining curve: Select second defining curve: First Defining Curve Second Defining Curve

25. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 25 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics EX15-10 – Pedestal Cone  Game Plan Make Ø35 circle in WCS Move UCS to Ctr Move UCS up 10 New Circle Above previous Ruled Surface Between Circles Frustum of Cone on Top of Circle

26. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 26 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics All Done for Today DoNuts Anyone?

27. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 27 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege.edu Engr/Math/Physics 25 Appendix 

28. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 28 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics EX15-10.1 Command: snap Specify snap spacing or [ON/OFF/Aspect/Rotate/Style/Typ e] : 5 Command: '_layer Command: z*Cancel* Command: c CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: Specify radius of circle or [Diameter]: d Specify diameter of circle: 35  Make Blue Obj Layer

29. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 29 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics EX15-10.2  Move UCS and Make 2nd circle Command: ucs Current ucs name: *WORLD* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Appl y/?/World] : m Specify new origin point or [Zdepth] : Command: _-view Enter an option [?/Categorize/lAyer state/Orthographic/Delete/Restore/Save/Ucs/Window ]: _swiso Regenerating model. Command: ucs Current ucs name: *NO NAME* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Appl y/?/World] : m Specify new origin point or [Zdepth] : z Specify Zdepth : 10 Command: c CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 0,0 Specify radius of circle or [Diameter] : d Specify diameter of circle : 35

30. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 30 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics EX15-10.3  Improve SurfTab1  Make Ruled Surface Command: surftab1 Enter new value for SURFTAB1 : 60 Command: Command: _rulesurf Current wire frame density: SURFTAB1=60 Select first defining curve: Select second defining curve: Command:  Next

31. BMayer@ChabotCollege.edu ENGR-22_Lec-26_SurfaceModel-1.ppt 31 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics EX15-10.4  Build Cone in 10-High UCS Make 60 segments to Match Base Command: _ai_cone Specify center point for base of cone: cen of Specify radius for base of cone or [Diameter]: d Specify diameter for base of cone: 35 Specify radius for top of cone or [Diameter] : d Specify diameter for top of cone : 20 Specify height of cone: 30 Enter number of segments for surface of cone : 60