why do we use first angle projection and third angle projection only and not

why do we use first angle projection and third angle
projection only and not 2nd and 4 thangle projections?

Question Posted / rcm_mech

2 Answers
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why do we use first angle projection and third angle projection only and not 2nd and 4 thangle ..

Answer / neeraj

it is because in 2nd & 4th angle projection there comes
problem of overlapping

Is This Answer Correct ?

60 Yes

13 No

why do we use first angle projection and third angle projection only and not 2nd and 4 thangle ..

Answer / velu

I think for both 2nd and 4th angles, the drawings would not line up as they do for 1st and 3rd angles. Therefore, though its feasible to draw them, 1st and 3rd angles save more time when referring to them as they are simpler representations (they actually make sense :) )
When we fold the imaginary planes of projection. In first and Third the drawings separate but in 2nd and 4th they would be on top of each other.

Is This Answer Correct ?

20 Yes

10 No

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