3D solid modeling starts with extrude. Like other 3D software, these commands work similarly with AutoCAD 2009 as well. Only difference is in order to rotate working plane, you have to rotate the UCS itself in such a way that “XY" plane become aligned with working plane. We don’t have 3D cut options directly available with AutoCAD 2009, however we can use subtract command for that. Let’s now discuss extrude and revolve commands one by one.
When you can think of extrude to be used?
Extrude is the basic material addition process. So the starting feature of your model could be extrude. Normally, non axisymmetric geometry is modeled using extrude. Cube, bricks and combinations of cube and bricks are some shapes for which you can use extrude.
How to do 3D modeling using extrude?
Set the workspaces to 3D modeling by following menu browser> tools>workspaces> 3D modeling.
Now go to the home ribbon tab, here in 3D modeling panel you will see the extrude icon but before clicking the icon your sketch, which you want to extrude, should be ready. The sketch can be line, polygon, triangle, rectangle etc. If you use line as a sketch and try to extrude it, it will become surface. Click on the extrude button now, it will ask for the objects to extrude, select the sketch or even you can select any existing surface as well. Give the height, how much it should be extruded, and you are done with extrusion.