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Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege

Engineering 22. Surface Modeling - 2. Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege.edu. 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

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Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege

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  1. Engineering 22 SurfaceModeling - 2 Bruce Mayer, PE Licensed Electrical & Mechanical EngineerBMayer@ChabotCollege.edu

  2. 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. Recall - Invoke Surface-Shapes SurfacesToolBar • Or Command Line • ai_XXX • XXX = box, wedge, pyramid, cone, etc.

  4. Game Plan Use Surface-Box & WCS to Make Box-a Move UCS to Top of Box-a, and Build Box-b Use 3D-Orbit Command to obtain better 3D view Move UCS in TWO steps to “front” of Box-b EX15-4 → Connected Boxes

  5. Use Xline and Offset to move-down the UCS on “front” of Box-b Draw Box-c using the Surface-Box Command Use 3D-Orbit to obtain the Final “Tilted” view similar to that shown in TextBook EX15-4 Game Plan Time For Live Demo

  6. EX15-4 Final Result

  7. EX15-16

  8. In WCS Draw Arched Base using Rect, Arc, Circle Explode Rect Use Properties Menu to Change thickness to 13 Move UCS to “Lower Rt” corner of Arched Base Use “new” UCS command with “3Point” Option to reorient Z-Axis Set Thickness to 13 Draw Vertical Box Locate Circle Center with Xlines Draw Ø16 Circle EX15-16 Game Plan

  9. EX15-16 – Final Result

  10. Game Plan Draw Front Form in WCS with Thickness = 40 Move UCS and Draw Ø24 Peg with Thickness = 18 EX15-22

  11. Move and Rotate UCS to Draw Ø40 SemiCircular Pedestal with Thickness of 8 Move UCS to To “Top-Ctr” of Ø40 Pedestal Draw SemiCircular Prism with Thickness of 40 EX15-22 Game Plane

  12. EX15-22 Final Result • Hide OFF • Hide ON

  13. All Done for Today SurfaceModelin 3D

  14. Engr/Math/Physics 25 Appendix  Time For Live Demo Bruce Mayer, PE Licensed Electrical & Mechanical EngineerBMayer@ChabotCollege.edu

  15. Make Blue Obj Layer Box in WCS EX15-4.1 Command: _ai_box Initializing... 3D Objects loaded. Specify corner point of box: <Snap on> Specify length of box: 6 Specify width of box or [Cube]: 5 Specify height of box: 2 Specify rotation angle of box about the Z axis or [Reference]: Command: Command: _-view Enter an option [?/Categorize/lAyer state/Orthographic/Delete/Restore/Save/Ucs/Window]: _swiso

  16. Move UCS with Mouse & OSnap; Make New Box as cube EX15-4.2 Command: ucs Current ucs name: *WORLD* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: m Specify new origin point or [Zdepth]<0,0,0>: Command: _ai_box Specify corner point of box: Specify length of box: 4 Specify width of box or [Cube]: c Specify rotation angle of box about the Z axis or [Reference]: Command: _vpoint *** Switching to the WCS *** Current view direction: VIEWDIR=-1.0000,-1.0000,1.0000 Specify a view point or [Rotate] <display compass and tripod>:

  17. Move Up & Over with Mouse & OSnap EX15-4.3 Command: ucs Current ucs name: *NO NAME* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: m Specify new origin point or [Zdepth]<0,0,0>: Command: ucs Current ucs name: *NO NAME* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: m Specify new origin point or [Zdepth]<0,0,0>: z Specify Zdepth<0>: -1 • Move w/ Zdepth

  18. Make Last Box Rotate View with 3D Orbit EX15-4.4 Command: ai_box Specify corner point of box: Specify length of box: 5 Specify width of box or [Cube]: 2 Specify height of box: 1 Specify rotation angle of box about the Z axis or [Reference]: Command: '_3dorbit Press ESC or ENTER to exit, or right-click to display shortcut-menu. Regenerating model. Command: ucs Current ucs name: *NO NAME* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: m Specify new origin point or [Zdepth]<0,0,0>:

  19. Make the Base in WCS Need to Explode Rect and Remove line thru Circle EX15-16.1 Command: rectangle Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: <Snap on> Specify other corner point or [Area/Dimensions/Rotation]: @35,30 Command: _arc Specify start point of arc or [Center]: Specify second point of arc or [Center/End]: _c Specify center point of arc: mid of Specify end point of arc or [Angle/chord Length]: Command: c CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: mid of Specify radius of circle or [Diameter]: d Specify diameter of circle: 13 Command: _-view Enter an option [?/Categorize/lAyer state/Orthographic/Delete/Restore/Save/Ucs/Window]: _seiso Regenerating model. Command:

  20. EX15-16.2 Command: explode Select objects: 1 found Select objects: Command: e ERASE Select objects: 1 found Select objects: Command: <Snap off> Command: Command: Command: Command: Command: Command: Command: Command: _propertiesCommand:

  21. Move UCS With Mouse-Pick EX15-16.3 Command: • Rotate UCS Axes with • NEW • 3Point Option

  22. EX15-16.4 Command: ucs Current ucs name: *WORLD* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: m Specify new origin point or [Zdepth]<0,0,0>: Command: ucs Current ucs name: *NO NAME* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: n Specify origin of new UCS or [ZAxis/3point/OBject/Face/View/X/Y/Z] <0,0,0>: 3point Specify new origin point <0,0,0>: Specify point on positive portion of X-axis <1.0000,0.0000,0.0000>: nea to Specify point on positive-Y portion of the UCS XY plane <0.0000,-1.0000,0.0000>: Command: Specify opposite corner: *Cancel*

  23. Set Thickness to 13 Draw Side-Box using Xline and Line EX15-16.5 Command: thickness Enter new value for THICKNESS <0.0000>: 13 Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: Specify through point: Specify through point: Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: Specify through point: nea to Specify through point: Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <Through>: 37

  24. Set Thickness to 13 Draw Side-Box using Xline and Line EX15-16.6 Select a line object: Specify side to offset: Select a line object: Specify side to offset: *Cancel* Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <37.0000>: 30 Select a line object: Specify side to offset: Select a line object: Command: l LINE Specify first point: Specify next point or [Undo]: Specify next point or [Undo]: Specify next point or [Close/Undo]: Specify next point or [Close/Undo]: Specify next point or [Close/Undo]: *Cancel*

  25. Locate Circle Ctr with XLines Draw Circle Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <37.0000>: 12 Select a line object: Specify side to offset: Select a line object: Specify side to offset: *Cancel* Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <12.0000>: 15 Select a line object: Specify side to offset: Select a line object: *Cancel* Command: c CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: Specify radius of circle or [Diameter] <6.5000>: d Specify diameter of circle <13.0000>: 16 EX15-16.7

  26. EX15-16.8 – Final Result

  27. Base Form in WCS Xline Line Circle & Arc EX15-22.1 Command: limits Reset Model space limits: Specify lower left corner or [ON/OFF] <0.0000,0.0000>: Specify upper right corner <420.0000,297.0000>: 297,210 Command: '_layer Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: Specify through point: <Ortho on> Specify through point: Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: Specify through point: Specify through point:

  28. EX15-22.2 Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <Through>: 70 Select a line object: Specify side to offset: Select a line object: Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <70.0000>: 60 Select a line object: Specify side to offset: Select a line object: Specify side to offset: Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <60.0000>: 35 Select a line object: Specify side to offset: Select a line object: Specify side to offset: Select a line object:

  29. EX15-22.3 Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <35.0000>: 10 Select a line object: Specify side to offset: Select a line object: *Cancel* Command: l LINE Specify first point: Specify next point or [Undo]: Specify next point or [Undo]: Specify next point or [Close/Undo]: Specify next point or [Close/Undo]: Specify next point or [Close/Undo]: *Cancel* Command: l LINE Specify first point: Specify next point or [Undo]: Specify next point or [Undo]: Specify next point or [Close/Undo]:

  30. EX15-22.4 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: 10 Command: arc Specify start point of arc or [Center]: Specify second point of arc or [Center/End]: Specify end point of arc: Command:

  31. EX15-22.5 Command: _-view Enter an option [?/Categorize/lAyer state/Orthographic/Delete/Restore/Save/Ucs/Window]: _swiso Regenerating model. Command: tr TRIM View is not plan to UCS. Command results may not be obvious. Current settings: Projection=UCS, Edge=None Select cutting edges ... Select objects or <select all>: 1 found Select objects: Select object to trim or shift-select to extend or [Fence/Crossing/Project/Edge/eRase/Undo]: Select object to trim or shift-select to extend or [Fence/Crossing/Project/Edge/eRase/Undo]: *Cancel* Command: <Snap off> Command: Specify opposite corner: Command: Command: Command: Command: Command: Command: _propertiesCommand

  32. Draw Ø24 Knob Xline Thickness = -18 Circle Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: cen of Specify through point: mid of Specify through point: Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <10.0000>: 30 Select a line object: Specify side to offset: Select a line object: *Cancel* Command: Thickness Enter new value for THICKNESS <0.0000>: -18 Command: c CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: Specify radius of circle or [Diameter] <5.0000>: d Specify diameter of circle <10.0000>: 24 EX15-22.6

  33. 3D Orbit to Obtain Good View Move UCS to make SemiCirc Prisms EX15-22.7 Command: ucs Current ucs name: *WORLD* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: n Specify origin of new UCS or [ZAxis/3point/OBject/Face/View/X/Y/Z] <0,0,0>: x Specify rotation angle about X axis <90>: -90 Command: UCS Current ucs name: *NO NAME* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: m Specify new origin point or [Zdepth]<0,0,0>: mid of Command:

  34. Make Pedestal Base with Circle, Thickness = 8, Arc Command: thickness Enter new value for THICKNESS <-18.0000>: 0 Command: c CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: mid of Specify radius of circle or [Diameter] <12.0000>: d Specify diameter of circle <24.0000>: 40 Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: Specify through point: Specify through point: Command: thickness Enter new value for THICKNESS <0.0000>: 8 Command: arc Specify start point of arc or [Center]: Specify second point of arc or [Center/End]: c Specify center point of arc: mid of Specify end point of arc or [Angle/chord Length]: Command: *Cancel* EX15-22.8

  35. Make SemiCirc Prism Move UCS Thickness = 40 Circle & Arc EX15-22.9 Command: ucs Current ucs name: *NO NAME* Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] <World>: m Specify new origin point or [Zdepth]<0,0,0>: mid of Command: c CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: mid of Specify radius of circle or [Diameter] <20.0000>: d Specify diameter of circle <40.0000>: 28 Command: Thickness Enter new value for THICKNESS <0.0000>: 40

  36. Make SemiCirc Prism Move UCS Thickness = 40 Circle & Arc EX15-22.10 Command: arc Specify start point of arc or [Center]: Specify second point of arc or [Center/End]: c Specify center point of arc: mid of Specify end point of arc or [Angle/chord Length]: Command: ARC Specify start point of arc or [Center]: Specify end point of arc: *Cancel* Enter new value for THICKNESS <40.0000>: 0 Command: l LINE Specify first point: Specify next point or [Undo]: Specify next point or [Undo]:

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