This AutoCAD tutorial is show you how to make 3D object with different side, and this tutoria for basic mechanical, check it out!!!
More Video Tutorial
AutoCAD Purge Command: https://www.youtube.com/watch?v=P8HvWudjfLI
AutoCAD 3D House Modeling: https://www.youtube.com/watch?v=FERNTAh5s0I
AutoCAD Tutorial Playlist: https://www.youtube.com/playlist?list=PLjyiWW2QlmFwXcacgfcrwHWU2jNMYd37C