Morning everyone, hopefully you are all doing well right now!

I have a part here about which PC-DMIS is giving me a very hard time.

So, in essence the part is three sides of a cube - two parallel faces and a face connecting them. The parallel sides each have a hole, datums B1 and B2, with planes A1, and A2 around each hole respectively and a point for datum C on the perpendicular side connecting the other two. Hopefully you are able to picture the part.

The main problem is that PC-DMIS will run through the first and second iterations just fine, then on the third, if it doesn't throw an "Iterative Alignment Error" it will rotate the part by nearly 90° about the X-Axis.

I set up the co-ordinate system matching the CMMs but centered in a hole on the faces in which datum C lies. What I am trying to do in the alignment is level to A1 and A2, rotate about the midpoint of B1 and B2 to datum C, then origin on the midpoint. Every time that I run this offline it works just fine but it doesn't work the way that I want it to on the machine.

I have tried changing the axis the iterative alignment uses and it doesn't seem to make a difference.

I have a part here about which PC-DMIS is giving me a very hard time.

So, in essence the part is three sides of a cube - two parallel faces and a face connecting them. The parallel sides each have a hole, datums B1 and B2, with planes A1, and A2 around each hole respectively and a point for datum C on the perpendicular side connecting the other two. Hopefully you are able to picture the part.

The main problem is that PC-DMIS will run through the first and second iterations just fine, then on the third, if it doesn't throw an "Iterative Alignment Error" it will rotate the part by nearly 90° about the X-Axis.

I set up the co-ordinate system matching the CMMs but centered in a hole on the faces in which datum C lies. What I am trying to do in the alignment is level to A1 and A2, rotate about the midpoint of B1 and B2 to datum C, then origin on the midpoint. Every time that I run this offline it works just fine but it doesn't work the way that I want it to on the machine.

I have tried changing the axis the iterative alignment uses and it doesn't seem to make a difference.

## Comment