Datum Curve to Helical Sweep?

[JimiH]

Hello


I am trying to sweep along a selected trajectory by selecting a datum sketch (created on a flat plane) and the edge of a surface (created by a helical sweep)


The helical sweep has the datum curve as a reference so there are no gaps.


However proe throws an "Specified trajectory is not valid. Please reselect"








What Im trying to model is a rope tied in a noose (dont ask

)


Just thought it would be difficult to model which it is.


2009-09-04_085426_123_str2.prt.zip


Thanks


Geoff
Edited by: JimiH

 

[tobbo]

Is this what you want to achive? if so, one way to solve it is to use another curve between the "helical surf" and your sketch. I did a free curve in isxd, then just a VSS to show what i mean.





//Tobias

 

[JimiH]

Thanks Tobbo


Could you upload the proe part please?


Geoff

 

[zpaolo]

Have you tried using a constant section VSS?

Paolo

 

[JimiH]

Yes VSS fails, think its the tangency between the helical surface and the sketch.


Suppose you would have the identical problem modeling a cork screw.





A straight curvegoing into a helical sweep going back to a straight curve


Geoff

 

[tobbo]

Yepp, its a tangency problem for the Vss. Should work with constant section, but it dont... anyway,...


here you go


2009-09-07_025354_123_str2.prt.zip


//Tobias