So far I have only seen that I can constrain the radius in feature calculations. Can we constrain result calculations to things like vector and position as well?
Right now we have a part with a free-form hourglass-like cavity on the inside. The drawing calls out that the circle formed by the smallest crosssection of this hourglass has a rather tight position tolerance. I figured I would just measure the hourglass like a cylinder and set the max inscribed fitting algorithm to obtain the smallest cross-section. Thing is, I would need to constrain the vector of this cylinder to exactly 1,0,0 IJK for the location to be correct.
I guess since it's not a true cylinder the question doesn't make a whole lot of GD&T sense. But the way we are going to interpret this callout is as a 2D true position of the circle formed by the smallest cross-section of the hourglass shape to the Y and Z axis. If they really wanted 3D axial position they should have called out a profile tolerance. You are correct, if I was trying to evaluate the whole surface for the position, a COMPLETELY different approach would have to be taken. This isn't even the silliest callout on this drawing.
I guess since it's not a true cylinder the question doesn't make a whole lot of GD&T sense. But the way we are going to interpret this callout is as a 2D true position of the circle formed by the smallest cross-section of the hourglass shape to the Y and Z axis. If they really wanted 3D axial position they should have called out a profile tolerance. You are correct, if I was trying to evaluate the whole surface for the position, a COMPLETELY different approach would have to be taken. This isn't even the silliest callout on this drawing.