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

[@AjayKumar-yy8qh]

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.

[@MechanicalDesignAdda]

Hi Ajay..... Good explain....you are right 👍❤️

[@ToxicNation254]

According to the point where I can understand brother e've got you but i was stucked for answering

[@HarithHansaka]

Hi Ajay, I think there is a problem when we rotate anti-clockwise. The drawing will get upside-down.

[@MechanicalDesignAdda]

If you rotate in anti clockwise then 1st and 3rd angle projection overlapping issues and you will get orthographic view in 2nd and 4th angle of projection

[@DPatel-rn4xb]

Last 10 yrs i am doing product drawing in cad but this time i am understanding all angles easily thanks,

[@MechanicalDesignAdda]

Thank you, your comment motivated me

[@KK-yg1iw]

Your video’s are very knowledgeable for beginners

[@bhaskarthakur8305]

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.

[@MechanicalDesignAdda]

Thank you...Thakur Overlapping is the only issue.. Because if you want a 2D view for that general rule is to rotate plane by 90° after projection and at that time it will overlap with other plane... View will overlap and we unable to get projection on drawing.. Thank you..... keep watching

[@ishan5719]

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...🙏🙏🙏

[@MechanicalDesignAdda]

Thank you Ishan.....

[@jonam123456]

Perfectly explained. No doubt remaining.

[@MechanicalDesignAdda]

Thank you for your comment.......stay connected

[@sureshsai8554]

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?

[@MechanicalDesignAdda]

Hi Suresh, really good question, We can do that by rotating the plane 90 deg anticlockwise we will get projection. But in that case whatever the projection we are getting,if you compare with Clockwise first and third angle projection it will be same. So 2nd angle projection act as a 3rd angle projection And 4th angle act as a 1st angle of projection. But we generally follow clockwise rotation considering standard one👍. I hope you understood & Thanks for valuable comment

[@djskate9183]

Very well explained, thank you.

[@MechanicalDesignAdda]

Thank you for your comment 😊

[@surjeetsharma33]

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).

[@MechanicalDesignAdda]

In the angle of projection most things are standardized Two planes are the imaginary transparent plane We have two options 1 and 3rd angle of projection to get the 2D view We need to follow standard because if we have number of option then we will get number result Drawings are universally accepted so we need to take standard option we have so that everyone can understand and avoid confusion To summarise all, to avoid confusion and maintain drawing standard we need to follow recommended standard practice of 1st and 3rd angle of projection👍 Let me know your point of view ☺️

[@surjeetsharma33]

@@MechanicalDesignAdda I know we are following standards based on some principles but my question is why? Clearing that will make the viewer more knowledgeable.

[@MechanicalDesignAdda]

As I said, more options create confusions as drawing are referring all over the world So the reason we are following standard practice in angle of projection is to confusion. If we have no. Of option in angle of projection then everyone follow different different method and it will create confusion As drawing goes in different departments and different steck holders

[@BhagyarajuGoriparthi]

sir why we need to rotate horizontal plane in 2nd and 4th angle method

[@MechanicalDesignAdda]

See other comments I already answered this question

[@Lenka___YT]

Always rotate 90° in horizontal plane.

[@mamathals467]

Very nice expln.

[@sanketbhilare7862]

Nice explained sir 🙏🙏🙏 Thanks

[@MechanicalDesignAdda]

You are welcome....... Stay connected..... Keep watching

[@sanketbhilare7862]

@@MechanicalDesignAdda Thanks

[@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

[@MechanicalDesignAdda]

First angle projection, second angle projection, third angle projection, and fourth angle projection are all different methods of representing a three-dimensional object on a two-dimensional plane in technical drawing, and they do not involve converting a projection from the eye into a 3D object. The projection described in the question is called perspective projection, which is a type of projection commonly used in art, architecture, and computer graphics to create the illusion of depth and three-dimensionality in a two-dimensional image. I hope you got an answer👍

[@opsorryyt]

@@MechanicalDesignAdda Thanks bro but i didnt get my answer

[@MechanicalDesignAdda]

Ok, can you please rewrite your questions in some simple way so that I can understand what you want. I will try to answer your questions 😊

[@opsorryyt]

@@MechanicalDesignAdda Sir it is the same question as it is and 2 times repeated in my test

[@akashsutar9906]

Nice explanation Sir

[@MechanicalDesignAdda]

Thank you 💓

[@willowsfabstop6923]

Good teaching . Go ahead 👍

[@deepyram3103]

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

[@MechanicalDesignAdda]

I have not understood your question Do you want me to explain front, side and top views ?

[@itidraftsman3640]

Nice explain Sir

[@Pramodj75]

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

[@dhananjaybmishal4960]

Nice explanations. Thank You.

[@rajaj2993]

Excellent explanation 👍👍

[@MechanicalDesignAdda]

Thank you ☺️ Stay connected........

[@mechanicalscholar7595]

Good explanation

[@tfi2463]

Good Art

[@mohammedmubarak1327]

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

[@MechanicalDesignAdda]

To get the orthographic view (2D view)

[@SatishSharma-vz4rn]

Why we need to rotate the plane in 2nd and 4th angle time ?

[@MechanicalDesignAdda]

It's rule, so that we can get the orthographic view (2D view)

[@manojmanu105]

Super sir

[@mamathals467]

Made easy for online class

[@surjeetsharma33]

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.

[@MechanicalDesignAdda]

First and third angles are both are in used, it depends on the organisation, client and supplier which practice they are following so that everyone can understand drawing

[@random2059]

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

[@MechanicalDesignAdda]

Hi Friend, In first angle of method, we have observer---object(body)---plane In third angle of method, we have Observer---plane---object(body).. So our ultimate aim is to have a projection on plane to get a 2D view. So that's the reason only. For 1st angle method-- viewing from left, place view on right or vice versa For 3rd angle of method-- viewing from left, place view on left or vice versa because now' plane is in the middle of observer and body...so projection is on observer side I hope you got your answer...... Stay connected........ take care

[@random2059]

@@MechanicalDesignAdda so that's it .it's just a rule... nothing to worry about thanks sir 😭

[@mbs0710]

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

[@MechanicalDesignAdda]

Welcome ....keep watching

[@jabestinisravel1650]

good

[@tfi2463]

Nice

[@vrtv5309]

Why should you rotate the horizontal plane clockwise ??

[@MechanicalDesignAdda]

Hi, Please check other comments I have already replied You will get the answer

[@hellotech007]

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

[@MechanicalDesignAdda]

It's standard practice that we are following If we rotate anti clockwise we will get 2nd and 4th angle of projection and 1st and 3rd will overlap So to avoid any confusion and everyone on the same page standard are fixed in angle of projection so that everyone can can same standard method and understand drawing If we have number of option for angle of projection then it will create confusions among all

[@keshavshelke3275]

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.

[@yourevolution7850]

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?

[@MechanicalDesignAdda]

First and third angles are methods of representing drawing views only, country to country they will use the first or third method of projection.

[@yourevolution7850]

@@MechanicalDesignAdda which angle projection is used in India?

[@MechanicalDesignAdda]

Generally first angle projection is used in India and Europe countries. Third angle is used in America and Australia

[@debabratabanerjee776]

HP VP & PP this three are compulsory required in drawing. Without PP drawing will not be completed.

[@MechanicalDesignAdda]

The Profile Plane (PP) is a vertical plane perpendicular to both the Horizontal Plane (HP) and the Vertical Plane (VP). It is used to project the side view of the object, often referred to as the right-side view or left-side view, depending on the orientation. In video, I have just shown front and top projection which is important and for side view it work same

[@abhibhagran751]

Legend watching this video in 2023😂

[@zorojuro_001]

2024

[@seemakwasta8215]

Overlapped means what ?

[@MechanicalDesignAdda]

Overlapped means one object or view on another object or view

[@Ajithajith-ki4my]

Why we need to be rotate 90 degree for 2nd and 4th angle projections

[@MechanicalDesignAdda]

To get the 2D view (orthographic view)

[@rakshithgowda7793]

Why we have to rotate plane in clockwise only.? Why not CCW..?

[@MechanicalDesignAdda]

Hi Rakshith... I already this in comments... Please go through comments

[@vasimbagwan6746]

Why third angle projection is not used in Asian countries?

[@narasimhajatavathu5632]

Problem s 1&3 quadrant s present sir

[@magantank3435]

Sir you explain vary good but sir can make video in Hindi language? If possible?

[@MechanicalDesignAdda]

Magan... Thanks for valuable comment Yes I will upload in hindi also stay connected Keep watching & keep learning

[@ravinderbouthu8600]

Why we don't rotate vertical plane?

[@MechanicalDesignAdda]

Generally we follow standards of rotating horizontal plane in clockwise direction. we can't rotate vertical plane in Clockwise direction it will result in overlapped view But if you rotate vertical plane in Anti clockwise it will give you orthographic view

[@pranovgeorge5071]

We dont rotate vertical plane because, observer is watching the vertical plane as per standard. Soif you rotate vertical plane then observer can't see the projection plane any more. So we move horizontal plane inorder for the observer to see projection even after the rotation.

[@debabratabanerjee776]

Where is pp

[@Bhaavasangama]

How to identify which measurements in direct view for any part diagram

[@curious0014]

Bhai galat bataya hai yar tumne. There is no rotation problem. 1st and 4th angle project are same .... Except in 4th angle....top view is on the top. Similarly 2nd & 3rd angle proj are same except... In 2nd angle top view is on bottom

[@MechanicalDesignAdda]

Nahi Bhai, video me ekdam sahi information he. Jab hum horizontal plane ko rotate karte he closewise direction me tab jake Hume view milate he. 2nd and 4th angle of projection me fv and tv overlap hote he isliye o method hum use nahi karte Aasha karta hu me aapko samja Paya 😊

[@tfi2463]

Confusing to recognise

[@singhdaljit1053]

Jhanttu bna diya apni gndi english se aap achj khasi video ko

[@MechanicalDesignAdda]

Thank you for comment I will work on it ....

[@mahanteshhosamane3727]

Your video's are very knowledgeable for beginners

[@MechanicalDesignAdda]

Thank you Mahantesh........

[@yasodharbayapalli5090]

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

[@MechanicalDesignAdda]

We need to rotate the horizontal plane in clock wise direction to get projection on drawing We can't place views on drawing in 3D view

[@yasodharbayapalli5090]

@@MechanicalDesignAdda ok sir got it👍