Why 2nd and 4th angle projection not used ? | Difference between first and third angle of projection

After watching this video you will know below points....
1. what is first and third angle projection
2. Difference between first and third angle projection
3. How to easily identify first and third angle projection on drawing
4. Why we don"t used second and fourth angle projection

#firstandthirdangleprojection
#orthographicprojection

Thank you for watching
Mechanical Design Adda

[AjayKumar-yyqh]

The reason, as far as I understand is that, we stick to 1st and 3rd angle projection methods, just for standardization purpose, so that instead of four different approaches, now we have to go with only one of two approaches. And, clock-wise "sounds good" than anti-clockwise rotation. In case of 2nd and 4th angles, overlap happens only when following clock-wise rotation of horizontal plane ( we do it to have both projections in the same 2-d plane, for sake of representing in a "paper"). If we rotate anti-clockwise, the issue with overlap goes away, and we get both views in same plane. But the results would be the same as rotating clock-wise for 1st and 3rd angle projections. This is just an opinion. Feel free to correct me or add more info on why we go with the choice.

[ishan]

Bahut baar ye quadrant ke pange samajh mein nahi aate hai bahut dino tak... Lekin apne bahut achhe se bahut short time mein poora clarity se samjhaye ho... Thank you so much sir...🙏🙏🙏

[KK-ygiw]

Your video’s are very knowledgeable for beginners

[surjeetsharma]

Currently 3rd angle is used everywhere since 1st angle cads create confusions. Also not using 2nd and 4th angle is due to +ve and -ve values in same quadrants which is not possible for a product. Please remember how you use to make a graph when studying in school.

[bhaskarthakur]

you have explained very well. but as far as 2 and 4 quadrants is concerned, why these two plans are not being used. can you elaborate more.

[keshavshelke]

please make your concept clear because your explanation doesn't clarify 1st angle and 3rd angle symbol. your view of 3d model on 1st and 3rd angle projection is wrong. think about it please.

[sureshsai]

Why can’t we rotate the planes 90 degree anti-clockwise for 2nd and 4th angle of projection to get the views on the same plane of paper?

[mbs]

Nice
I have viva in the evening
Know nothing
Now thanks to you something I know😂😭

[surjeetsharma]

Question.
1. Why are we viewing from the right side only?
2. Why numbering the quadrants are in anti clock wise directions?
3. If we are viewing the 1st angle from right side why we can't view 4th angle from left side? And vice versa?
4. Here you explained about 2 planes (horizontal and vertical) where you impose the view. On which principal we are rotating the object for other views? If object is not rotated where are other planes? (A total of 6 planes have to be there).

[jonam]

Perfectly explained. No doubt remaining.

[deepyram]

Any chance you’d be able to explain which ones are the front elevation, end elevation and plan view?

[hellotech]

Why we rotate 90 degree angle along clock wise? Why clock wise why not anticlockwise?

[opsorryyt]

Please answer
Q1)the projection originated from from the eye ball and converted into 3d object to project a 2d image on the plane is the
(a) 1st angle projecetion (b) 3rd angle projection (c) 2nd angle projection (d) 4th angle projection
.
Q2) the projection originated from from the eye ball and converted into 3D object to project a 2D image on the plane is the
(A) 1st angle projecetion (B) 3rd angle projection (C) 2nd angle projection (D) 4th angle projection

[yasodharbayapalli]

Why should we rotate the axes for 2nd and 4th angle projection?

[vrtv]

Why should you rotate the horizontal plane clockwise ??

[random]

Sir please reply...why in 3rd quadrant left side on left and righ on right ....not like the 1st left on right and righ on left .... please reply please it's so confusing ..any body help please

[yourevolution]

Why there are first and third angle projection?
Why we all can't go with only first angle projection? What is the significance of using first and third angle projection?

[mohammedmubarak]

Please explain the part why do we need to rotate the horizontal plane clockwise ? What is the need.

[Pramodj]

Why we rotate horizontal plane at c/w direction..?

[ravinderbouthu]

Why we don't rotate vertical plane?