Different between cartesian vs x/y call out?

[[Th...]]

Sometimes I noticed the result will vary a bit if I pick cartesian distance vs standard x or y call out on say for example datum -B- wall to a hole. Why is that?

[[Pe...]]

Cartesian Distance: The length of a straight line perpendicular to the second feature to the center point of the first feature. Note, be sure to use the second feature as the reference.

X/Y: The X/Y coordinates of the feature origin on whichever alignment it is on. Open a feature, and look where the trihedron appears, that is your feature origin and the result of the X/Y coordinate. Not great since features will always have some angle deviation so you could get some odd results especially on cylinders.

[[SH...]]

X ,y values are the particular features local co-ordinate value.
Cartesian distance use centroid of the feature.
Reason is that the form error and projection angle deviations of the feature. So it is obvious you'll get different values.

[[Th...]]

I'm still confused. After I origin and aligned the part, I would use x/y/z callouts for most callouts instead of cartesian? When would I need to use cartesian?

[[SH...]]

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It will be useful, when you want to check distance that are non parallel to the alignment axis.