GD&T Tutorial 24.6 : 3-2-1 Principle

GD&T Tutorial : 3-2-1 Principle
Every object in space will have 6 DoF (Degrees of Freedom).
They are 3 linear and 3 rotational degrees of freedom.
At the time of manufacturing and inspection, the part must be in stable condition, hence it becomes necessary to arrest all the degrees of freedom.
3-2-1 Principle describes ways of constraining the 6 degrees of freedom.
When a part is placed on a Primary datum, it requires minimum of 3 points and it constraints 3 degrees of freedom. As the part comes in contact with secondary datum, it requires at least 2 points of contact, and 2 degrees of freedom will be constrained. Contact of the part with tertiary datum requires at least one point to constrain 6th degree of freedom

[@prabhamurugan-p5d]

Finally,I understand the 3-2-1 principle by simple method thank you. Sir

[@csas1596]

Sir i am a 6 years of experianced mechanical engineer but i was trying a lot of time to understand gd and t through lot of books and videos, but what i learnt from your videos is phenomenal i dont have words to explain it. Thanks a lot sir

[@fahidahmd5938]

Hi I need to know something from u

[@vaibhavsingh2302]

No one can explain better than you sir, 🙏

[@akhtarkamal9255]

I appreciate your way to explain the 3-2-1 rule. Thank you so much for the effort.

[@PalaniKailash]

welcome

[@Abhishek-ju7wm]

Best explanation. Thanks a lot sir

[@ananthrk876]

Great video sir..

[@aravindhansrinivasan2194]

Great video

[@saidgaci9179]

thanks, you made it very easy. Can you please give us example of 3,3,0 principle? and 5,1,0? thank you

[@justinnoor4915]

Excellent video

[@karthiksethupathy3629]

Nice Explanation. The duration of the Vdo too is 😁321😉

[@arjunmohod6886]

Nice observation😅

[@praveenmanickam4942]

Very well explained

[@vedart2523]

I was Seen Lots Of Video on this Principle but I can't Understand ,what is the meaning of exact 3 2 1,but your explanation is Awesome..

[@bharathsingh8006]

Big fan sir

[@debasishsahu3082]

Sir if one object is sphere schape then how 321 pincepel work?
Rotation also not restric.

[@PalaniKailash]

Watch this video for answer
th-cam.com/video/EwaDJ5ocGBU/w-d-xo.html

[@ranjithkumar-rc1sh]

Great explained 🤝

[@PalaniKailash]

Glad it was helpful!

[@lifemantraaz255]

👌👌👍

[@PalaniKailash]

👍