topic Re: Sheet metal flange tool weird new behavior - Fusion in Fusion Design, Validate & Document Forum

Sheet metal flange tool weird new behavior - Fusion

Miha-M — Fri, 21 Nov 2025 20:35:32 GMT

Why it is behaving like this. It suppose (and it used to) to make one continuous sheet metal piece bent 5 times. Now it treats every polyline se a separate body?????
Anyway to make it behave like it used to? Treating all the connected polylines as single piece and applying bends at connections as well.

This post has been edited due to: @heather_tracy added the product to the title to help more users find this topic via external search.

Re: Sheet metal flange tool weird new behavior

Miha-M — Fri, 21 Nov 2025 09:55:57 GMT

EDIT:
It is even worse. It creates a single body sheet metal part that it then fails to create flat pattern for,.... 😵

Re: Sheet metal flange tool weird new behavior

g-andresen — Fri, 21 Nov 2025 10:04:26 GMT

Hi,

works fine here

Please share the file for reply.

File > export > save as f3d on local drive > attach to post

günther

Re: Sheet metal flange tool weird new behavior

Miha-M — Fri, 21 Nov 2025 10:51:32 GMT

Here you go

Re: Sheet metal flange tool weird new behavior

g-andresen — Fri, 21 Nov 2025 11:39:17 GMT

Hi,

There is obviously an error in the sketch in the connection of the lines at the origin, but it could not be corrected in the sketch.
Therefore, I created a new sketch that produces the expected result.

(view in My Videos)

günther

Re: Sheet metal flange tool weird new behavior

Miha-M — Fri, 21 Nov 2025 12:05:03 GMT

I get that. But up until now you did not have to do it in one go. Lines were automatically merged to one polyline (so to speak) you could start in the center and then added line. I do it like this all the time because a lot of times i change / add sheet metal profiles afterward. This effectively prevents changing base sketch line once you close the tool. It should not do that. This severely limits what this tool can do.......

Re: Sheet metal flange tool weird new behavior

g-andresen — Fri, 21 Nov 2025 13:30:42 GMT

Hi,

@Miha-M schrieb:

Lines were automatically merged to one polyline (so to speak) .

However, this was not done correctly in your case. That is why I deleted the lower part of the sketch in this screencast and reinserted it.

(view in My Videos)

I was unable to reproduce the erroneous behavior in several attempts.

günther

Re: Sheet metal flange tool weird new behavior

Miha-M — Fri, 21 Nov 2025 13:41:09 GMT

So what did I do wrong?
why doesnt merge the lines if merging point is in coordinate origin? If i add the line on the opposite side it works just fine....

Re: Sheet metal flange tool weird new behavior

Miha-M — Fri, 21 Nov 2025 14:02:52 GMT

edit: im out of office now...

Re: Sheet metal flange tool weird new behavior

Miha-M — Fri, 21 Nov 2025 13:59:46 GMT

here is a video

Re: Sheet metal flange tool weird new behavior

g-andresen — Fri, 21 Nov 2025 16:33:41 GMT

Hi,

In some tests, I noticed that the phenomenon only occurs when the profile starts at the origin and another element is added there.

If you create the primary profile without binding it to the origin, you can add elements and, if necessary, subsequently bind the docking position to the origin using a constraint.

Perhaps @johnsonshiue can take a look at this.

Günther

Re: Sheet metal flange tool weird new behavior

johnsonshiue — Fri, 21 Nov 2025 17:58:34 GMT

Hi Folks,

I took a quick look at this design. I have seen the behavior before. It seems to be related to the open profile recognition. Creating a surface from the same sketch may lead to the two separate surface body also. Somehow the horizontal line (150mm) is constrained to a point (probably a corrupted projected origin?), not to the end point of the vertical line. As a result, it leads to a split. If I delete both the horizontal line and the vertical line, and recreate them, the profile will be properly recognized.

I suspect this is a corruption case. If we can reproduce it from scratch, it will be very helpful to finding a fix.

Many thanks!

Re: Sheet metal flange tool weird new behavior

TheCADWhisperer — Fri, 21 Nov 2025 18:15:58 GMT

@johnsonshiue

@Miha-M

I deleted the Coincident Constraints and moved the lines away from the Origin. (I did not delete the lines.)

I then applied a single coincident and left them away from the Origin, observed the same unexpected behavior.

Edit: I then tried deleting EITHER the vertical line or the horizontal and replacing. Replacing EITHER of these lines returned to expected behavior.

Re: Sheet metal flange tool weird new behavior - Fusion

Miha-M — Mon, 24 Nov 2025 06:21:15 GMT

So i tried this at home on my hobby license fusion. After updating to the latest version this behavior occurs. Dont know which version i was on before update. i kind of resist updating if not necessary. So it must be a bug in latest update?

Re: Sheet metal flange tool weird new behavior - Fusion

GC_CC — Mon, 24 Nov 2025 07:52:33 GMT

Hello, I have the same problem. See https://forums.autodesk.com/t5/fusion-design-validate-document/changes-in-sheet-metal-flange-tool/td-p/13915715

It is indeed a bug and will hopefully be fixed soon.

Re: Sheet metal flange tool weird new behavior - Fusion

Miha-M — Thu, 27 Nov 2025 06:14:21 GMT

So i moved the lines out of the origin and join them, then move the back to origin. An this happened

Re: Sheet metal flange tool weird new behavior - Fusion

Miha-M — Wed, 03 Dec 2025 06:45:47 GMT

So how log does it usually take to squish a bug like this?

Re: Sheet metal flange tool weird new behavior - Fusion

Miha-M — Fri, 19 Dec 2025 06:36:13 GMT

I see this hasn't been resolved in last update

Re: Sheet metal flange tool weird new behavior - Fusion

Miha-M — Thu, 26 Feb 2026 12:14:16 GMT

Still not fixed on

2606.1.36 x86_64

Re: Sheet metal flange tool weird new behavior - Fusion

johnsonshiue — Thu, 26 Feb 2026 17:00:07 GMT

Hi Miha,

I am sorry I don't know why it has not been resolved. I thought it was. Maybe I misunderstood the issue to begin with. Are you trying to merge the new Flange to the existing one? The panel shows it is creating a new body.

Many thanks!