Another over-constrained sketch bug (or is it?)

[catot]

I'm still getting over-constrained errors that should have been fixed. I have many years of Inventor experience, and I expect to have the same constraint/Dimension behaviour in sketches also in Fusion.

3 months ago, I had a similar issue, and got assigned ID FUS-24320, have this been fixed? Or is it a differnet issue than described below? Please see this tread regarding the topic: http://forums.autodesk.com/t5/design-validate-document/bug-software-says-dimension-will-over-constra...

Here's what I'm having problems with this time, see Picture below and attached model.

I try to add the horizontal Dimension on the left ellipse, but get a error. I can however Dimension the right one without problem, but that's not what I want. I want to Dimension the far left one, and make all the other ellipses follow this, that's why I have the Equal-constraints.

Similar, I want to add an Equal-constraint to the two vertical lines as shown, but am not able to, but for some reason dimensioning the vertical one on the right side is not a problem at all...

Am I missing something? Is there something special in how this should work compared to Inventor? I would expect Fusion to behave similary.

If there are some special consideration I have to make to avoid these issues, then I would love for @jeff_strater to give another excellent look behind the scenes at what's going on.

[HughesTooling]

I've had the equal constraint fail like that a few times. A work around if you need to get it done is to use dimensions and reference the second 2 dimensions from the first. One problem I noticed is the middle line is not fully constrained and moves when the dimensions are added, not sure why that's happening!

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@catot wrote:

I have many years of Inventor experience, and I expect to have the same constraint/Dimension behaviour in sketches also in Fusion.

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I think the constraint solver in Inventor is licenced from someone else and the one in Fusion is Autodesk's own.

Mark

[catot]

@HughesTooling

Thanks for the reply. I'am able to work around it, but in the end i would expect this approach to work as intended. So instead of silently accepting it and working around it, I wanted to highlight that there are things that doesn't work predictably, that should be fixed.

[FrankCao]

Hi catot,

Thanks for reporting this issue. It's a false over-constrain bug in sketch. Now I have reported FUS-26349 to development team to take a look at. 

Also we are still investigating the issue you reported before for FUS-24320. We will try to fix them soon. Also it's very interesting that it seems you often use ellipse in Fusion sketch. And we really did not test too much on ellipse related constraint solving, we will test more on ellipse in future.

Regards,

Frank