location of furthest point on radius?

[Steven Carpenter]

I need to find the distance from my origin to the tip of the radius. I constructed the auto radius. How do I ask for the location of its south most point? See attached.

[LaserJay]

Create a generic point at XYZ zero and then do a distance dimension from the point to the circle. In the distance utility box use 3D and add radius.

[Schlag]

You talking like a MAX distance from a scan ? Laser method will get you there 100%. Depends on how you made the circle and what type of tol. you are looking at I guess ?

[JesseB413]

This is one way to do it

F1 =GENERIC/POINT,DEPENDENT,CARTESIAN,$
NOM/XYZ,<CIR2.TX,CIR2.TY-CIR2.TR,CIR2.TZ>,$
MEAS/XYZ,<CIR2.X,CIR2.Y-CIR2.R,CIR2.Z>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>
DIM LOC2= LOCATION OF POINT F1 UNITS=MM ,$
GRAPH=OFF TEXT=OFF MULT=1.00 OUTPUT=BOTH HALF ANGLE=NO
AX MEAS NOMINAL DEV +TOL -TOL OUTTOL
Y -7.0000 -7.0000 0.0000 0.0500 0.0500 0.0000 ----#----
END OF DIMENSION LOC2

[vpt.se]

The result is a calculated point using radius and center point (not the "actual" point most furthest from the origin), implying the radius is as round as possible.

[JesseB413]

You're right, thanks for the clarification vpt.se

[vpt.se]

No worries, I felt that we had to explain the differences between the two solutions.

[JEFMAN]

assign/v1=sqrt(dot(cir2.hit[1..cir2.numhits].xyz,cir2.hit[1..cir2.numhits].xyz))
assign/v2=maxindex(v1)
f1 =generic/point,dependent,cartesian,$
nom/xyz,<cir2.hit[v2].x,cir2.hit[v2].y,cir2.hit[v2].z>,$
meas/xyz,<cir2.hit[v2].x,cir2.hit[v2].y,cir2.hit[v2].z>,$
nom/ijk,<cir2.hit[v2].i,cir2.hit[v2].j,cir2.hit[v2].k>,$
meas/ijk,<cir2.hit[v2].i,cir2.hit[v2].j,cir2.hit[v2].k1>

[vpt.se]

This retrieves the actual hit of the radius that is furthest from the origin (not a calculated point).

[JEFMAN]

Thanks for the explanation, vpt.se !

[vpt.se]

No worries, I felt that we had to explain the differences between the two solutions.

[JEFMAN]

In addition, the dot product is a product between two vectors.
Here, just using the coordinates of a point (or a set of points) is exactly the same than using the components of a vector between origin and the same point (because the vector PT1PT2 is constructed by PT2.XYZ-PT1.XYZ, so if PT1=<0,0,0> , PT2.XYZ-PT1.XYZ=PT2.XYZ !!!!!)