The Intersect command is one the the three Boolean operations mentioned in a previous blog post, and is one of the many methods of 3d modeling which we explore in our Autocad 3d courses.
For example, to create the bracket on the top right, first create two boxes as in the far left image. Go to the Visual Styles panel and change from Wireframe to Conceptual mode. Then select the Union tool in the 3D Make panel (or Modify > Solid Editing > Union, or simply type uni in the Command line). Then click the two boxes in the model and hit Enter. Note that the edge lines separating the two original boxes have gone; this is now one single object.
Next draw a line across the top surface of the base box and use this as a guide to create a cylinder which intersects the box. Then select the Subtract tool in the 3D Make panel (or type su in the Command line). Click on the L-shaped object and hit Enter (this is the Main Object). Then click on the cylindrical object > Enter (this is the Cutting Object). A circular hole should appear in the L-shaped object (see above left).
Now we are ready to use the Intersect command. This will retain the shared areas of any two solids. Select the Line tool and draw construction lines down the centre of the L-shaped object. Next select the Sphere tool and create a sphere from the centre to the outside edge (see above centre). Finally select the Intersect tool, click on both objects and hit Enter. You will be left with the bracket shape on the top right image.
Lastly delete the construction lines. You could create more boxes to subtract further from the shape, eg. to pare down the sides.
The 3d interface in Autocad is user-friendly and easy to learn, and we take time to teach a broad range of applications in our classes including modeling, materials, lighting and animation. See many examples of our clients’ work on our Facebook page. For more information there are lots of resources on the web, but try the Autodesk site to begin with: www.autodesk.com. Support options and user forums are also available from the home page.
Other related Autocad 3d Blog Posts:

• Autocad 3d introduction
• Autocad 3d modeling
• Autocad 3d blocks
• Autocad 3d commands
• Autocad 3d basics