Feature being measured in opposite direction?

[[Do...]]

I've never seen this happen, but my measured position is flipped from the nominal. Has anyone seen this before?

For context, I am measuring a cylindrical part on a rotary table. The primary Datums A and B are along the Z axis, measured at 3.200" and -3.200" respectively. I construct a 3d line from the circle paths and use that in my base alignment as my spatial and my X and Y. 

I was going to just take a fresh manual alignment and see if that addresses the issue, but wanted to see if there was anything I should look at first. 

[[Ma...]]

Is you base alignment primary from a cylinder? In that case I would rather scan two circles and make 3d line from them.

[[Ja...]]

My guess is your strategy circle path has a start height of 3.2, should be zero. Look at the feature and show the nominal circle and the measured points and see if they line up. 

[[Do...]]

The alignment was from a 3d line along Z axis and I also had another 3d line constructed from two circles paths along the X axis. I noticed that the planar rotation was affecting the direction as the alignment trihedron was inverted to the part in Z axis. I adjusted the planar and it looks like it works fine now. Thanks all!