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

Engineering
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BS8888 is the standard for engineering drawing, we work by those standards. only the people who wrote em will know. does it matter?
bcz in 2nd and 4th projection we can't express the all views like isomatric view 3dview..............
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.

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