evaluating a 45° angle between planes.

[[RP...]]

We're having some trouble agreeing on an angle result.

Depending on what the other plane is, the CMM measures the angle between 43° - 47°

I'm told by the engineer that it's actually a near-perfect 45°. 

The customer uses a 3d scanner and their results are very close to my cmm results.

Is there a super secret way to evaluate angles differently?

Here's a visualization of the chamfer's profile.  I added random datums to constrain the DoF.

 

 

 

[[Ma...]]

If it's just a chamfer, then i would stick to the closest feature to this chamfer. In other words it's local angle

If part is thin it can bend by fixture force or machined features can bend via machining forces. Then chamfer is to none machining force.

So if it's chamfer of a hole - you can compare angle to plane at hole or hole itself.