Unfold and Flat Pattern issues

[rhetths]

I am very familiar with the challenges of creating components ripe for unfolding and flat patterning.  I just created two such components as far as i can tell but they cannot be unfolded or flat patterned.

I have noticed more issues with this function lately, recently i derived a component into another file, deleted the design history, then copied it back into the original file and then it mostly unfolded and flat patterned, which suggests there is a Fusion issue not a user issue.

Refer attached.

[Warmingup1953]

There are a number of yellow flags in your timeline but they may not be an issue...I am suspicious of these repairs:

I'll have a closer look tonight my time

[rhetths]

I removed the script because why would i post the script here?  In hindsight i should have deleted the creation of the script from the timeline.  So i just went back and did that and swapped the edited file into the opening post.

[TheCADWhisperer]

@rhetths 

If this were my design I would model in finished form and let Fusion calculate the flat pattern.

Otherwise the true dimensions aren't known unless you do a lot of calculations.

[rhetths]

Yes, this has been modelled almost in final form.  I just want to angle across the ends of two bends and i think i need to flatten it to do that, plus i need to flat pattern it to be able to machine it.  

[rhetths]

Attached is another one that is also not able to be unfolded or flat patterned.  I have been using the same modelling techniques i have used in the past many times with Fusion and they were able to be unfolded and flat patterned.  I also created a third component at the same time as these and i am able to unfold and flat pattern it.

[TrippyLighting]

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@rhetths wrote:

...  I have been using the same modelling techniques i have used in the past many times with Fusion and they were able to be unfolded and flat patterned. ...

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There is no timeline to evaluate, so not way for us to assess anything.

[rhetths]

I see now that 'Derive' kills the design history.  I think i derived it because it wasn't allowing me to 'copy' and 'paste new' it into a new file.

My impression is that if the design history is deleted, and if the component has acceptable geometry, the design history can then be turned back on, the part can be made into a sheet metal body, and it can then be unfolded and flat patterned, and if this cannot be done there must be a flaw(s) in the geometry?

I have done this process many times successfully.  If need be i have eradicated flaws in the design by assessing the geometry.

[TrippyLighting]

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@rhetths wrote:

I see now that 'Derive' kills the design history. 

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Deriving does not kill the design history!

It creates a derive feature in the timeline of the design it was derived into.

[rhetths]

Well, it had design history before i derived it.  The design history of the components is long and convoluted, i based the components off existing components and extensively modified them.  I don't normally try to solve problems by fiddling with the design history, and when i try to do that in this case i can't make any headway.

It has always been my impression that if the geometry doesn't have issues the component can be unfolded and flat patterned, even if the component has to have the design history turned off then back on, but now i am having issues where the geometry may be fine but it is still a no go.

[rhetths]

I did another test to see if Fusion still accepts my workflow, and it unfolds.  Refer attached.  So seemingly i have components created in the same way, one can be unfolded and the other cannot.  Maybe the key difference is the design history, one component has a long design history and the other does not?  If this is the problem, i think it is a new problem, because i have plenty of other components with long design histories that i have continued to be able to modify without issue, and components where i have turned off a long design history and been able to modify it without issue. 

[rhetths]

I found a flaw.  Its tiny, that is maximum zoom.  Can Fusion end up with rounding errors?

I got rid of the flaw and tried again and it worked.

Do you think a flaw like that would ordinarily be found and eradicated through the design history?

[TrippyLighting]

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@rhetths wrote:

..

Do you think a flaw like that would ordinarily be found and eradicated through the design history?

...

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Yes, that is a possibility.

[rhetths]

My other component has four bends, three of them don't work at all and the other does something weird.  I just found another flaw the same as i found in the other component, refer image in this post.  I have noticed in the past that when a sketch line is made tangent to a circle the line doesn't always actually touch the circle, when you zoom in on it and look closely.  I think this is the cause of this issue.    I think this issue has cursed me in the past, but the issue is now much more prevalent.  I hazard a guess the program has been altered in some way making it worse.

Just like this help forum which has been exhibiting software flaws it didn't have in the past.

[TrippyLighting]

If you want me to look at a model and make assessments, then you need to share a complete model.

If there's a bug, I'll help report it. 

[rhetths]

The west is in such decay.  In the recent past businesses wouldn't create or sell products saturated in flaws, and if ever a flaw was mentioned to them they would investigate it themselves, they wouldn't rely on a user.  Then they would actually fix it.  If they created another problem while fixing it they would fix that problem too.  They would have a professional approach.  They wouldn't create a lazy self centric system that demands IP from users, so they can sell it on the dark web?  Developing countries are hungry for success and will wipe out legacy organisations.

Please refer file attached.

[TheCADWhisperer]

Line is tangent to the circle and coincident to the quadrant.

Your graphics issue observation  is as old as CAD itself.

(Search AutoCAD VIEWRES)

[TrippyLighting]

It appears that I've not been clear enough in my quest for a data set.

I have access to see a full design of a Sheetmetal component with a timeline, that preferably does not contain any yellow, or red icons after a Modify->Compute all.

Disclaimer: I am not an Autodesk Employee . I have precisely zero interest in your IP.

[rhetths]

It took me about three days to create four components and about four days to fix multiple bugs in two of them.  I don't think i created any of the bugs.  One of the components was a new creation from scratch and there were no bugs.  Two of them were based on components with long design histories that i then heavily modified, and they had the bugs.  In one of those i had created two folds using the 'bend' command, so there should not have been any issues with those folds, but the bug cancer infected even them somehow, and i had to recreate them.  A while ago i noticed Autodesk created a bug whereby cut lines randomly remain even though i don't select for them to be retained, this bug could be a cause of the issues i found, and or perhaps the long design histories have overwhelmed the computations and created flaws?  So the productivity score is low for these ones.

[TheCADWhisperer]

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@rhetths wrote:

... i had created two folds using the 'bend' command....

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@rhetths 

Very unlikely that I would use Bend in one of my designs.