Can't update Flat Pattern after changing parameter

[hrading]

Hi,

I have been struggling with some drawings that I have created about a year ago.

This one is a transition piece from a rectangular duct to a round duct. The dimentions are defined by parameters, and previously when I changed these values, my design updated (It still does), and after updating the flat pattern (by right-click menu) I can see the unfolded part.

Now when I change the "Inlet_width" parameter from 112.5 mm to 115 mm, the design is updated, but when i open the flat pattern, the part is not unfolded.

If I change the "hose_diameter" parameter from 160mm to 180mm it works as expected.

I have attached an export of the part in question.

I would really like to know why this happens, as I have several parts with the same issue.

I'm on version 2.0.10148 of Fusion (personal) on Windows 10.

[Phil.E]

This is normally a lofted type of flange. But Fusion does not have lofted flange as you know.

Are the problems you find all related to lofted flange? If not, can you provide an example design?

[hrading]

All the other designs I have with similar issues, are designed arround the same approach. two drawings on planes seperated by distance, one with circle, one with square/rectangle. loft these drawings, create a gap using cut, convert to sheet metal and create flat pattern.

I have previously been able to modify the paramters, and have the flat pattern update.

The other designs I have that use flat pattern, is more straight forward and does not use loft. I have not found any issues with those I have tested.