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.
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......
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
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
Thanks, now i got the exact concept 3-2-1 principle method
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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.
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......
Why you had taken 3 pins on x-axis, 2 pins in y-axis, 1 pin inz-axis
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
Welding details
Thanks you much
Note ta deben please
Why 321 principle is called only 321 principle
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
Regarding this
My question is why 321 we can take 456 also know
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.