Fusion360 is not correctly associating the polygon+smd as one pad?

[ricardo.carvalhoTLUDG]

Hi everyone,
I'm using Fusion 360 for the first time after migrating a project started in EAGLE, taking some time to find out where the tools I need are, everything has gone very smoothly and peacefully.

Moving on to my problem, in fusion 360 when I use a component that has a polygon associated with the smd (fig.1-2)

when on the board I make a polygon pour fill it overrides the pads (fig.3), and this does not happen for the same component in EAGLE (fig.4)

This only happens in this component where the smd pad is not completely covered by the polygon, in other pads where the polygon completely covers the smd there is no problem.

Is it possible that Fusion360 is not correctly associating the polygon+smd as one? I ask this because the polygon was well identified and the clearance distance is well defined, the problem is in the smd itself as you can see from (fig.3).

Has there been any change in Fusion360 in the way smd+polygon pads are constructed?

What am I missing?

Regards,
Ricardo

[jorge_garcia · Accepted solution]

Hi @ricardo.carvalhoTLUDG 

Thanks for posting the images. @HelenChen-ElectronicsQA Could you make a ticket for this?

The workaround while we look into this is to have the polygon enclose the entire pad, since you mention that this issue only occurs if the polygon doesn't enclose the entire pad.

Let me know if there's anything else I can do for you.

Best Regards,

[jesper8W75R]

This is an already known issue.
Whether it's a bug or not can be discussed ad libitum.
I think it is correct as it is handled now.
The thing is that to make a polygon and pad connect, your polygon has to "cover" the center of the pad.
See for example my 8HSOF footprint below.
I have highlighted the polygon shape so you can see how it connects to pin 2

[ricardo.carvalhoTLUDG]

Hi @jesper8W75R,

thanks for the answer! I know that to connect a polygon and a pad the polygon has to cover at least the center of the pad, I have this, you can see in fig1-2 that I sent earlier, I think that's not the problem, because the same component works perfectly in EAGLE, the problem must be somewhere in the way Fusion 360 identifies these pads, as I said before, the problem is directly in the pad and not in the associated polygon.

Regards,

Ricardo

[ricardo.carvalhoTLUDG]

Hi @jorge_garcia,

Thanks for the answer!

My workaround was to put a restrict area on top of the component so I could send the board to production without having to change the component (because I'm also using this component in EAGLE and it's working).

If later it turns out that it's a problem that has no solution in Fusion360 I'll have to go through all my libraries and change the footprints so the polygons cover the entire area of the pad and not just go through the center.😱

Regards,

Ricardo

[ricardo.carvalhoTLUDG]

Hi @jorge_garcia, @HelenChen-ElectronicsQA 

I made a horrible component to test this problem, I have the same smd pad with different polygons on top, (fig.5) it seems that Fusion ignores the contours (or just the tStop layer) of the pad itself and only cares about the polygons (fig.6)

Regards,

Ricardo

[jorge_garcia]

Hi @ricardo.carvalhoTLUDG ,

I hope you're doing well. If you can share the file that you created to expose the issue and I'll pass it along to our devs. Are you using polygons to make the extending geometry. It almost looks like you are using rectangles, if you use rectangles instead of polys that might explain the problem.

Let me know.

Best Regards, 

[jesper8W75R]

@jorge.garcia : "if you use rectangles instead of polys that might explain the problem."
Maybe EXPLAIN it, but certainly not EXCUSE it.
It should work either way.

[ricardo.carvalhoTLUDG]

Hi @jorge_garcia,

I'm using polygons to extend the geometry.

I leave here attached the library with the two components for you to test.

Regards,

Ricardo

[jorge_garcia]

Hi Ricardo,

I hope you're doing well. Thank you for sharing the library. I can reproduce this, I'll pass this along to our developers.

Let me know if there's anything else I can do for you.

Best Regards,

[HelenChen-ElectronicsQA]

Hi @jorge_garcia , @ricardo.carvalhoTLUDG , @jesper8W75R 

This issue is tracked in our system, thank you very much for reporting this issue.

If we have any update about this one, we will keep you be posted.

Best regards,

Helen

[ricardo.carvalhoTLUDG]

Hi @HelenChen-ElectronicsQA , @jorge_garcia

It seems that this issue is solved in this last release (2.0.13618)

Thank you all!!!

Keep up the good work 👏

Regards,

Ricardo

[HelenChen-ElectronicsQA]

Cheers, Ricardo!

Thank you very much for your feedback.

Best regards,

Helen