Distance constraint incompatible with cylindrical

[Carbonated]

Hi all,

I'm trying to position a convergent body onto an assembly. The body has a cylindrical face on one of its extremities. I'm trying to position the other end using a fitted surface and setting a safety distance of 5mm between the surface and the component below.
Despite the cylindrical constraint leaving me one degree of freedom (rotation), and the convergent body rotating colliding with the component below (meaning the distance can be above and below
Probably the software tries to move the body rather than rotate it around the cylindrical face in order to meet the specified distance.
I currently am doing this positioning manually, but it is lengthy and imprecise. Is there any way to achieve this with normal constraints?



Thanks in advance,

 

[mmauldin]

I would try locating a point on the center of the distal stem, then align that point with a datum plane set 5mm + the radius of the stem above the green surface, Simpler math for NX and it won't go negative.

 

[Carbonated]

Problem is, the stem is a convergent body and has an irregular radii. That makes your point alignment and radii measurement subjective and, in the end, quite similar to manually moving the body to find the closest value.
However, aligning the surface with a datum somehow works. Why that works and not the face alignment, I have no idea.
Could be because as you mentioned, having a 5mm distance from the face can be achieved by the stem hovering above, but also below, making the constraint fail. Requiring a 0mm distance from a 5mm offset plane makes the constraint have a single solution, and therefore work.