hai, i am dinesh, will you please any body explain about why 2nd and 4th angle projection not used in mechanical engg. drawing

Question

anonymous · Answer

BS8888 is the standard for engineering drawing, we work by those standards. only the people who wrote em will know. does it matter?

anonymous · Answer

bcz in 2nd and 4th projection we can't express the all views like isomatric view 3dview..............

anonymous · Answer

2nd and 4th are not used because , to get the side view we have to rotate the horizontal plane by 90degree in clockwise direction , but when it is rotated in 2nd and 4th quadrant , it overlaps on the vertical plane making it useless. that's why 2 and 4 are not used.