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!

[[No...]]

When making a 3D line from recalled features, the first feature selected determines the origin of the line, the other(s) the direction. So if you select in the wrong order, the axis made from the line may end up flipped.

Edited May 18