Fusion Fails to Model M4 Thread

[sghitch]

I'm experiencing an issue in Design when specifically trying to model M4/0.7 or M4.5/0.75 threads. I can generate M4/0.5 and M4.5/0.5 threads without issue, or anything less than M4 or greater than M4.5. This happens both with ANSI Metric and ISO Profiles, and both when using the Thread and Hole Tap tools. 

In the cases where the thread generation fails, there are hidden edges that look correct for the thread, but there is an extra face that covers the entire minor diameter.

(Pictured: an M4 0.7 thread vs an M4 0.5 thread)

I've tried the steps shown in Solved: Fusion 360 won't create modelled threads of some sizes - Autodesk Community, except that this issue seems to persist across multiple machines, clearing the cache, or even uninstalling / reinstalling fusion.

Thanks!

[etfrench]

They work fine on my machine(Windows 10).

No hidden edges:

Attach your file showing the problem.

[sghitch]

It does appear to work fine on an external thread, only internal threads have an issue. Here's a super simple example that doesn't work on my machine (Minimal Repro.f3d). 

If I delete the extra faces and then extrude out the minor diameter, I get a thread that looks correct (Minimal Repro w Fix.f3d)

Actual Result (Minimal Repro):

Expected Result (Minimal Repro w Fix):

 

[MRWakefield]

Hmmm... it's working for me:

I have seen a similar issue with custom threads of Whitworth form but I don't think it's related to your issue. My first thought is the graphics driver but if it's affecting multiple machines then this seems doubtful.

Sorry I haven't been much help!

[jhackney1972]

Although it does not make a difference for me whether I use a Modeled Body (sketched based) or a Primitive, as you did, please try modeling a sketch block and try the thread in it on your end.  Do you get the same result?

[MRWakefield]

I could check your thread file against mine to see whether it's been corrupted if you'd like to post it here.

[etfrench]

Threads are created normally on my machine in your file:

@Phil.E: Strange behaviour😁

[sghitch]

I get the same results if I use a solid derived from a sketch vs a primitive (attached below)

RE: the issue being a graphics driver problem, the face still shows up in an exported STL.

[sghitch]

Interestingly this issue has followed me across machines, updates, and re-installs of fusion. Here are my latest thread data files if you're willing to compare.

[MRWakefield]

I can confirm that both files are exact matches for the ones on my system so it doesn't look like it's a thread file corruption issue.