Why not Second angle and fourth angle projecions?

WikiAnswers - Why can not use second angle and four angle ...

In principal views, there is no overlap. Try making an auxilliary view from a second angle projection and you'll get the problem.

I have, by the way, used second (or fourth - I'm not smart enough to know the difference) angle views within a standard third angle drawing. But, the reason was to show something that could not be shown any other way and I LABELED the heck out of it.

And, that's the reason you don't use 2nd or 4th angles normally. People (especially machinists) easily understand either 1st or 3rd angles. If you use 2nd or 4th angles, the guy making this thing has to stop and really, really think about what he's seeing. You're asking for trouble. Why go there?

1st angle projection works by enabling the viewer to imagine the part set on a table (or a plane of projection) as the part is rolled (rotated) onto different sides of the plane of projection the top, bottom, right and left, views are intuitive. The part is on top / in front of both planes in the first quadrant.

3rd angle projection works by enableing the viewer to imagine the part under a plate of glass (like a monitor or T.V. screen) as the plane of projection, As the part on the opposite side of the plane is rolled (rotated) on the plane of projection the top, bottom, right, and left views are intuitive. The part is under / behind both planes in the third quadrant.

If you tried this with the 2nd or 4th quadrants the part is under / behind only one plane and on top / in front of the other plane. This makes visualization extremely confusing.