See, I interpret the figure as showing that the plane
is 15 away from the datum, not whatever the value turns out to be after a rotation. Several automotive design engineers I've worked with agree, the offset perpendicular to the specified axis need be exact. And it can make a difference - if nominal center to center is 10, actual is 10.1, and your true position is 0.2, if you rotate you'll be in, but if you offset you-ll be out.
In the end, however others do it is fine by me, though.
Exactly, if you rotate you'll be in, if you offset, you'll be out. That's why, your method is appropriate for a single axis basic, but not when the basics are in both axes, it's the same as calling for the angle. Because those 2 basics define two legs of a right triangle.
Exactly, if you rotate you'll be in, if you offset, you'll be out. That's why, your method is appropriate for a single axis basic, but not when the basics are in both axes, it's the same as calling for the angle. Because those 2 basics define two legs of a right triangle.