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AutoCAD Tutorial on 3D Extrude

written by: Suvo • edited by: Lamar Stonecypher • updated: 2/17/2010

After finishing this AutoCAD tutorial you will be able to create 3D extrude using Auto CAD 2009.

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    Extrude is the most basic and most important operation for any 3D CAD packages. You can now think of using AutoCAD 2009 for the 3D extrude creation. Though, the 3D extrude operation in AutoCAD 2009 is not that user friendly like inventor or ProE, but still it is improved a lot from the older version of AutoCAD.

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    Steps for Creating 3D Extrude Using AutoCAD

    • Start Auto CAD 2009.
    • By default you may got 2D Drafting & Annotation activated, in such cases you have to switch the work space from 2D Drafting to 3D Modeling. The workspace switching icon is at the bottom right corner of the AutoCAD GUI, see below:

    3D Extrude 

    Click on the small black triangle of the icon and you will get few options like below:

    3D Extrude 2 

    Click on the 3D Modeling option there. You will see that the GUI will change to incorporate all the 3D modeling icons.

    • Now change the visual style of AutoCAD in order to ensure proper display of the 3D geometric objects. For that go to Menu Browser > View >Visual Style> Conceptual. Now you are ready to create the 3D extrude and other 3D features.

    3D Extrude 3 

    • Now let’s say you have to create a 3D model like below:

    3D Extrude 4 

    Also assume that, the size of each sides of the cross section of the bottom column is 5mm X 5mm and the diameter of the top column is 4 mm.

    • Draw a square of 5mm X 5mm for creating the cross section of the bottom column.

    Click the Extrude icon available in 3D Modeling tray, see below:

    3D Extrude 5 

    • It will ask for “Select Objects to Extrude”, you select the 5mm X 5mm rectangle, you just created. And press Enter.
    • Next you have to specify the height by which you want the square section to be extruded. Type 30 and press Enter.
    • Bottom portion of your model is ready but you cannot see it until press the “Home” button near the “View cube”. See below:

    3D Extrude Viewcube 

    • After clicking the Home button you will see the model in isometric view.
    • Now you need to create the circular sketch at the top surface of the bottom column for creating the top portion of the model. For that, you need to define the top surface of the column as XY plane by moving the universal coordinate system (UCS) to the top surface.
    • Click on the “Top” of the “Viewcube” and you will see the top surface of the column will come in front of you like below:

    3D Extrude 6 

    • Now, type ucs at the command prompt of AutoCAD for moving the co-ordinate, it will ask for the origin.
    • Select the bottom left corner point of the rectangle.
    • Now, you will see it will ask for point on X axis, click on the bottom right corner point of the rectangle.

    AutoCAD will now ask for a point on XY plane, click on the top right corner point. And, the coordinate will be shifted like below:

    3D Extrude 7 

    • Now create the circle at the centre, you can use the midpoint snaps and draw two lines as shown above for finding out the centre.
    • Next, press the extrude icon and use the circle for extruding by 10mm. And, your model is ready.
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    Conclusion

    AutoCAD 3D extrude is very useful for creating 3D model using AutoCAD. Though AutoCAD 3D models are not parametric but still you can use it for creating presentation models.