Locate center point

[Lerak]

I want to know how can i use three points coordinate data around a ball (by touching like CMM) to find the center point of that ball (basically X,Y,Z) ?

 

[Fabian Munoz]

Lerak

Three points are not enough to determine a sphere, even if they are not colinear (lying on the same line).  You need four points, not coplanar (lying in the same plane) to uniquely determine a sphere.

Can you teach 4 points ?


Let me guess, after find the spehere ,you want to find the center of the sphere and make it a external TCP

It's going to take few lines of code in the robot to resolve the matrix but is not imposible


http://2000clicks.com/MathHelp/GeometryConicSectionSphereEquationGivenFourPoints.aspx

somar

[Lerak]

I have three spheres to build a Uframe, so i think of finding the center point of each sphere (without orientation of a plan linked each sphere).

That's why i was thinking of three points, but yes i could teach 4 !

Thanks for the link !