Custom threading using sweep along path and guide rail

[Anonymous]

Hi,

I am trying to create a custom trapezoidal thread on a cylinder.

I created a coil with a triangular profile using height and pitch. Constructed a "plane along a path" using 1 edge of the coil. Created a sketch on that plane and drew the thread profile. I also created a centre line for my cylinder.

For obvious reasons, the thread profile does not intersect the centre line/path.

The "Plane along a Path" is positioned at the beginning of the coil/guide rail (the figure given as the distance along the coil is 0.00, and I tried both proportional and physical distance).

The profile is small enough not to self-intersect when it is swept along the coil.

When I try to sweep the profile using path and guide rail, selecting the cylinder centre line as the path and the coil edge as the guide rail, I get the following errors and or warnings-

   1 error(s)

   The sweep could not be created using the specified path and guide rail.

   If the profile is partway along the path, try moving the profile to one end of the path.

      Swapping the path and guide rail has no effect, I.E. using the coil edge as the path and the cylinder centre line

       as the guide rail.

      If I change Extent from "Perpendicular to Path" to "Full Extents" I do get a custom thread - however the thread

       twists along the coil.

   Warning

   The path does not intersect the profile. For best results, the path should intersect the profile.

   Error

   The sweep would create an illegal surface. Try changing the profile or path.

      Again, I am trying to create a custom thread. How can the profile intersect the path?

      Also the profile is small enough not to self-intersect when swept along the coil.

I have tried a bunch of stuff, changing the pitch, profile and everything else that I could think of. As well as opening a new design.

Nothing helped.

Has the sweep function been changed?

Regards,

Brett

[davebYYPCU]

Centre line of the Cylinder - not going to work.  Because you mentioned a coil, 

You can use Path and Guide Surface, selecting the path Intersecting edge of the coil, and one side of the triangular coil.

Might help....

[HughesTooling · Accepted solution]

Export your f3d file and attach. What you describe should work but I've seen problems if there are part turns, 3 turns work but sometimes 3.5 will fail. I find using a guide surface usually creates segmented surfaces.

Here's an example using the centre line of the cylinder as the path. File's attached

Mark

[Anonymous]

Thank you sir. Not quite what I was looking for, but thanks.

[Anonymous · Accepted solution]

Thank you Mark.

That did it.

Regards,

Brett