spline from points, NX7.5.5

[turbineer]

sequence:
spline
through points
points from file, select file
OK to proceed
single segment
OK
Chain from All

Then I'm asked to select start point, but I can't pick my new points, even though I can see them.

Any advice?

thanks

 

[turbineer]

To be more clear: I can't create a spline with the above method, and I'm looking for a method that works. I need something exact, not a fit spline. I understand there may be slope or tangency uncertainties, but I would like to start with the default geometry that NX would create from my point set.

 

[jerry1423]

Is it possible to show a picture of all your points ?

 

[cowski]

Then I'm asked to select start point, but I can't pick my new points, even though I can see them.

What is your selection filter set to?

www.nxjournaling.com

 

[SvenBom]

I belive, that when you are asked for the start point, you already see your spline. Correct? If so, than there is no problem. Here is the description, of what is happening:
[ul]
[li]insert->curve->spline[/li]
[li]select through points[/li]
[li]select single segment[/li]
[li]select Points From File[/li]
[li]select the file and click OK[/li]
[li]the curve is now created. You should see the curve now.[/li]
[li]now, when you click on the OK command, you are creating new curve. And since you didn't select new file with point data, NX is asking you for a different method. And that is, selecting the points, that were created with sketch or with insert->datum/point->point.[/li]
[li]just close the dialogbox now, and you will have your curve.[/li]
[/ul]
Try this, to be convinced about this procedure:
[ul]
[li]draw five points anywhere[/li]
[li]insert->curve->spline[/li]
[li]select through points[/li]
[li]select single segment[/li]
[li]do not click on Points From File. Just click on OK. You are moved to the step, that is confusing you now.[/li]
[li]now, select Chain from All. You are now able to select start and end point.[/li]
[/ul]

I hope, that this explains and solves the problem.

 

[turbineer]

Thanks for all the knowledgeable replies.

Sorry, I probably cannot show a picture.

Selection filter: I believe I checked that, but I cannot recheck it now for reasons related below.

Sven: Thanks to you for the same level of detail I offered. I am now getting a different behavior from NX. Although it would give me the points I expected yesterday from the same file, now I get an error dialog that I've exceeded the maximum degrees, and I don't see any points. My file has 112 points in it, and I see the grayed out number 111 in the degree box, but I don't think that is a needed parameter if you are inputting points by a file.

I think I'm to restart NX and see what happens.

 

[cowski]

You won't be able to get a single segment spline through 112 points. Change the option to multi-segment and pick what degree you want, which will depend on what you are doing, but degree 3 or 5 is usually sufficient.

www.nxjournaling.com

 

[SvenBom]

Have you tried with multi segment instread of single? According to Help documentation for NX7.5, each segment is limited to 25 points.

 

[turbineer]

Sven and Cowski,

this sequence:
insert->curve->spline
select through points
select single multiple segments, degree 3
select Points From File
select the file and click OK
specify no constraints, and/or specify automatic slope
the curve is now created. You should see the curve now. I don't see the curve.

 

[cowski]

It is possible that the spline is outside of your view clipping bounds. Regenerate the view and perform a fit after running the spline command.

www.nxjournaling.com

 

[turbineer]

That's it! I had reset my CSYS yesterday, decided not to save due to lack of progress, and then my CSYS went back to the larger assembly's location.

I just recommended this page to a colleague

Thanks!