Parametric and associative 3 dimensional spline through points with end tangency 1

[DaveJFT]

Hi folks,

I'm trying to create a hose routing through clipping points. Please can someone show me how to create a parameteric and associative spline that is tangential to existing curves at the ends (where the hose pushes onto stub tubes) and passes through points that are spaced in 3 dimensions? The stub tubes are not coplanar and are oriented in 3 dimensions too.

Many thanks,

Dave

 

[DaveJFT]

Oh yes, NX7.5 btw.

 

[cowski]

I assume the stub tubes are components in an assembly and you want to draw the spline in the assembly file?

If so, here is a procedure that will accomplish what you ask:
[ul][li]In the stub tube part file, draw a line that represents the centerline of the tube. The end of the line will be used to define the spline start (or end) point and tangency, you may want to offset the line endpoint down the length of the tube a small distance.[/li]
[li]In the assembly file, wave link the line you just created up to the assembly level.[/li]
[li]Start the studio spline command; choose the through points option and specify the degree as 3.[/li]
[li]For the start point, pick the endpoint of the stub tube centerline (turn on end point snaps if necessary), pick the "G1" option if/when it pops up (this is the tangency constraint).[/li]
[li]Pick your clipping points in the desired order.[/li]
[li]Pick the end point of the other stub tube line, again chose the G1 option.[/li]
[li]Hide construction geometry as necessary.[/li][/ul]

I've assumed the 'clipping points' are in the assembly file, if not you may need to wave link those up to the assembly level as well.

www.nxjournaling.com

 

[DaveJFT]

Thanks cowski, that worked quite nicely. I was trying to use that command before but I wasn't getting the G1/G2/G3 boxes up so I couldn't get tangency. Obviously operator error but as I couldn't find how to get tangency I was forced to resort to the forum. I did struggle initially with flipping the direction of approach of the spline at its end bit then I found that if I picked the right arrow to double click on it would flip - not obvious but lesson learnt nevertheless. I swept a Pipe down it and job done.