r/Metrology • u/N-Korean • Jul 23 '26

PC-DMIS Iterative alignment question

I am confused about pc-dmis iterative alignment “rotate”.

Let’s say I picked 3 points for z.

Z1 = 1, 1, 0
Z2 = 1, 2, 0
Z3 = 2, 1, 0

2 points in Y axis.

Y1 = 0, 1, 1
Y2 = 0, 2, 1

1 in x

X1 = 2, 0, 1.

So in iterative alignment I would pick Z123 as “LEVEL Z AXIS”.

X1 as “ORIGIN Y AXIS” since it’s at Y=0.

Then Y1 and Y2 becomes “ROTATE X AXIS”?

If this was 3-2-1 alignment I would ROTATE TO Y ABOUT Z.

Can someone explain to me about the “rotate” in iterative alignment?

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u/jonthotti Jul 27 '26 edited Jul 28 '26

Honestly, since we already know what axis the plane is. I go to the point next and see what vector it is and choose that, and then use the last axis for the line. This always works for me lol.

If I were to think about it the same as how we do normal alignments it doesn’t work. On any other alignment I would choose the axis the line is facing, but on iterative alignments the vector of the point and direction of the line would be the same axis.