AutoCAD Tutorial
How to Model Screw with AutoCAD (cont'd)

Showing Threads in Isometric Views

The standard flat drawings aren't appropriate all the time. Perspectives, assembly manuals, and presentations are a some of those times. One firm covered most of their bases by including an isometric view in each of their block drawings. Just the two isometric views -- when rotated or flipped -- can account for many different perspectives.

But there are other views than just isometric, right? Then make a solid model. There are thousands of times when a 2D drawing isn't appropriate. By time you draw two isometric views, or just one real projection, you can make a solid model that can be viewed from an angle.