Custom Thread with coil function Please?!?!?!?

[mlangN8XKB]

Profile selectionCoil definitionresulting taper wedge threadIt's it possible we could have the coil function behave like Inventors so I can model complex custom tapered threads like I used to be able to?? I Would simply like to be able to select a profile like I could in inventor rather than only have the canned coil profile options.

As it stands I can see no path to modelling the attached in Fusion, which was easy in Inventor. Lets not forget that dimensional constraints are paramount.

Any Ideas??

[g-andresen]

Hi,

1. create a spiral with angle and pitch as desired
2. create a plane along the path (spiral path)
3. Sketch the thread profile on this plane
4. sweepe the profile along the path

günther

[mlangN8XKB]

Hi Gunther, three things,

I believe plane along a path will distort the thread profile by the helix angle.

It's a much more complex option than the extremely simple solution implemented by Inventor years and years ago.

I've never had any notable degree of success implementing the "accepted" workarounds to the degree that I would call them acceptable.

Mike

[etfrench]

This thread may contain a few useful hints.

[davebYYPCU]

The unequal spacing in your thread, is as per design, or a requirement for the mechanical fit?

I can get uniform spacing, but not tried to replicate yours.

Yes lots of fiddle, multiple sweeps due to the non tangent sweep edges at intersections of the barrel.

Done with Sweep and Guide Surface.

Might help.....

[mlangN8XKB]

That's not bad at all Dave.

I've been able to get results but it's hard to control everything so that I can replicate the thread to Spec. Its a double taper (pitch in this definition not Taper per foot) wedge thread, the load and stab flanks are on different pitches and only the load flank side follows the taper per foot exactly. Because the thread requires a flat root, the stab flank side, which is on a different pitch, needs to run on a steeper taper to blend at the root.

I just find the process aggravating and messy in Fusion especially considering I modelled this years ago in Inventor with one drawing and three coils to define the thread. No rails, guide surfaces or the like, only an axis and definition in the coil function. one coil for the stab flank, one for the load flank and one to clear the middle.

The Idea behind this type of threaded connection is to have the thread lock on the tapered flanks allowing for a high make up torque without "swelling" the connection.

Mike

[davebYYPCU]

Next to no knowledge of Inventor, 

I would have to get the taper thread flanks with two coils. Not going to be so different.

Depending on the detail, might get a Loft.

Apparently the two programs are only similar, and not a lot will be cross ported.

[mlangN8XKB]

Thank you for your efforts.

This process is dead nuts simple in Inventor. Certainly the guys working on Fusion could get their hands on a copy to see what a difference there is. I'm sure many of them are already aware. I just find it frustrating trying to get the banana in fusion when it comes to modelling custom threads and the coil function.

The images I posted are literally all that's involved with inventor. Drawing for profile and axis, coil function to define the sweep and done.

I guess I'll have to go back to Inventor for this type of thing which is a shame.

Thanks again

Mike