Richard Carlstedt
Well-Known Member
Ken, I know you wish to learn and that was the reason for the question so let me add a little more to the above which maybe will help.
Most Home Shop guys clamp things in a vise and think they have control...Nope !
One jaw is a Plane.. and when you look at 6DOF , the other jaw is a plane, but you really want a point .
When you have two opposing jaws ( ie planes) ...ONLY one is the master
Let me show you with a simple casting in a Vise
Note both the V Block and part are cocked when the vise jaws are closed ( 2 opposing Planes )
So realizing a Point should oppose the Plane we add a Dowel pin to act as the single point on the casting
Now this simple change has stabilized the part -the single point on the casting is opposed to the Plane
And this is for only 2 degrees of the 6 DOF , but it will accurately locate the part in that direction
We would need to restrict the other DOF to be perfect ( The above could not take side forces ie)
Rich
By the way, this is a huge subject...some guys spend their life on it
Edit was spelling error
Most Home Shop guys clamp things in a vise and think they have control...Nope !
One jaw is a Plane.. and when you look at 6DOF , the other jaw is a plane, but you really want a point .
When you have two opposing jaws ( ie planes) ...ONLY one is the master
Let me show you with a simple casting in a Vise
Note both the V Block and part are cocked when the vise jaws are closed ( 2 opposing Planes )
So realizing a Point should oppose the Plane we add a Dowel pin to act as the single point on the casting
Now this simple change has stabilized the part -the single point on the casting is opposed to the Plane
And this is for only 2 degrees of the 6 DOF , but it will accurately locate the part in that direction
We would need to restrict the other DOF to be perfect ( The above could not take side forces ie)
Rich
By the way, this is a huge subject...some guys spend their life on it
Edit was spelling error
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