3-2-1 Principle of location | 3-2-1 principle of fixture design

3-2-1 Principle of location | 3-2-1 principle of fixture design
Friends, This video help you to understand the 3-2-1 principle which important for mechanical product designer and fixture designer.
Also explained how to choose datum.
Watch the complete video and if you have query please comment
321 principle of location
#mechanicaldesignadda
Thank you
MDA

[@zainal9775]

Adtec shah Alam hadir 🗿success, berjaya

[@Nayan133]

3-2-1 principle :
3 (2T+1R) - 2 Translation + 1 Rotation,
2 (1T+1R) - 1 Translation + 1 Rotation,
1 (1R) - 1 remaining rotation.
In this way, all 6 degrees of freedom (3T + 3R) of a part should be constrained.

[@MechanicalDesignAdda]

Let me correct you my friend...
3- (1T+2R)
2-(1T+1R)
1-(1T)
And in this way We r constraining workpiece
And also we consider clockwise and anti clockwise rotation as one similarly upward and downward movement as one
I hope you got my point......

[@lok119]

Why you had taken 3 pins on x-axis, 2 pins in y-axis, 1 pin inz-axis

[@MechanicalDesignAdda]

3 pin forms the plane, 2 pin form the line and one pin
And combining above concept it will form the three plane we called it as primary secondary and tertiary plane

[@somnathk9483]

Note ta deben please

[@naveenk5442]

Welding details

[@naveenk5442]

Thanks you much

[@lok119]

Why 321 principle is called only 321 principle

[@MechanicalDesignAdda]

To hold any object we need to restrict 6 degrees of freedom, so the first plane restrict 3 motion, second plane restrict 2 motion and last one restrict one
That's why it is called as 321

[@lok119]

Regarding this

[@lok119]

My question is why 321 we can take 456 also know

[@MechanicalDesignAdda]

As already explained, 321 is because three plane restrict movement of object 3+2+1=6dof
Once we constrain 6dof we can say Part is fully constrain.