It seems to be very odd that I fail to constrain a line end to a spline pole (outside the sketch):
There seems to be no difference between the two splines. Hope to have your suggestions on fixing it. Thanks!
Solved! Go to Solution.
The original source of the problematic spline is Isoparametric Curve. I tried with many other isoparametric curve. Even after treatment of Composite Curve, Project Curve, Fit Curve, Remove Parameters, Copy/Paste, ..., the problem of pole constrain failiure persists. It seems to be a bug with NX 11.0.2. Hope to have a workaround. Thanks!
Hi @TimF Thank you for your reminding!
I just checked it again. You are right. Poles of outside planar splines can be used for constraining in sketch, but poles of outside non-planar splines can't. NX seems to handle the two kinds of splines in different ways. Really a surprise for me. Thanks again!
If you really want to constrain to the poles of a non-planar spline, one workaround would be:
Of course the sketch will need to be a later timestamp than the point set and project features...
I tried to project the non-planar spline into a sketch. The poles of the resulting planar spline still can't be used for constraining in the sketch.
If the non-planar spline is projected onto a plane outside the sketch, there's no problem for constraing in a sketch.
It seems to be a little difficult to understand. Thanks!
Hi @cowski1, Thanks for your solution!
It seems that your step 2 is unnecessary. Points in the point set are directly usable in sketcher.
The point set is definitely associative with the spline. But there seems to be a small issue: the spline is not listed under the Parents folder of the Point Set feature.
I had attempted to create points one by one manually on the poles, but failed. Poles simply can't be snapped outside the sketch environment. It's great to know Point Set can do the job.
A couple of things:
Of course, that's given all the info presented in the example file you provided - should the splines move dramatically, then this method might need to be reconsidered.
Hi @TimF Thanks!
You don't have to project to a Sketch - just draw a line between the spline endpoints, but a Datum CSYS at the midpoint of the line with the X-axis in line with the line. Project the spline onto the XY-plane. Again, all of these features will have to be before the Sketch with the 2 lines.
Yes. Projecting the spline to XY-plane is ok. And projecting it to a sketch does not work. It seems to be a little odd.