Tilted plane used for alignment

[[Se...]]

Hi all, 

Think I'm having a brain loss moment and cannot figure out how to align a particular part (will add photos when I’m in work).

Part is 1” square tube bent into a half ring, the half ring is then twisted/tilted 30 degrees, meaning there is no ‘flat’ surface to create a plane on.

Can’t help but feel I’m missing something simple? 

[[Ma...]]

Special button in alignment window - add rotation.

[[Lu...]]

Well you can mesure allways a cylinder and align and create a prependicular plane therorical from the measured cylindr, but you need allwazs a point to create a origin for one of the axis

[[Se...]]

Picture added in case my rambling didn’t make sense! 
This is how to part sits on the CMM.

[[Du...]]

Did a quick sketch to see how calypso would work with it, looks like calypso thinks it would be a cone. you could use that surface as your X and Y origin and the intersection of that and the outer surface as your Z origin for your base alignment

Edited Wednesday at 11:42 AM
fixed wording

[[Ma...]]

If you can - make lines and their intersections at least 3 times around a part - that should be sufficient.

[[Lu...]]

Mesure the ring faces to level up the plane and in the special button rotate 30°  coordinate system on Y axis

[[Be...]]

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This is the approach that I would use. three points define the plane and potentially the center of the part.  I might use some side holes to control rotation about the Z axis and similarly the X? direction (the direction that the arc is open.