Can't fully constrain a sketch

[axel.dumas.kct]

Hello !

It's my first post on your forum and I am relatively new on Fusion 360.

I mainly use Fusion 360 to make holes in aluminium plates and electrical boxes.

On an other project, I wanted to create a SUB-D (https://fr.wikipedia.org/wiki/D-sub) hole.

In my little project, I am nearly sure that my sketch is fully constrained.

I wanted to set one circle at the same distance from the square than the other. So I use "=" canstraint.
But it doesn't show a my circles in black.

 I have to put a hard value myself to get it black (the 7mm).

It's very disturbing to have blue lines when I think it should be all black.

Do you have an idea on the "problem" ?

If you need more informations, doesn't hesitate to ask me.

Thanks a lot for your help,
Sincerley.

[hamid.sh.]

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@axel.dumas.kct wrote:

... I wanted to set one circle at the same distance from the square than the other. So I use "=" canstraint.

But it doesn't show a my circles in black.

 ...

---

Your thinking is correct and what you described above must fully constrain this sketch, if done correctly. I did it:

I wonder where is the problem. Could you export your file to *.f3d and attach it here so I can take a look?

[axel.dumas.kct]

Hello @hamid.sh., thanks a lot for your help !

Oh, that's good ! And surprising.

Yes, I send you the file.

Sincerely.

[dsouzasujay]

Hi @axel.dumas.kct 

The more you use Constraints the less you can use the Dimensions

I have created a screencast video to explain how we can use Constraints in a sketch to define symmetry.

[axel.dumas.kct]

Hello @dsouzasujay, thanks for your help.
Yes, I understand that.

Where can I find your ScreenCast video ?

EDIT : I have just found that when I do a line from the square to the circles, and then I apply "=" constraint, it fully constrain my skecth.

However, if I start from circles to the square, it seems it doesn't works.

Is there a real difference ?

[dsouzasujay]

Hi @axel.dumas.kct 

There are lot of ways we can constrain a sketch geometry, it all depends on the type of sketch we are constraining.

You can refer below video (The one i have missed to add in the last post)

https://autode.sk/3u9uuoA

We can also use mirror the hole along the center construction line.

[hamid.sh.]

@dsouzasujay This looks like a bug. When I draw construction lines starting from circles' center I can't make it fully constrained. But when I start from the rectangle I can. Here is a screencast.

[axel.dumas.kct]

Oh...I should learn to create ScreenCast too. ^^'

@dsouzasujay No problem for your link.
It's interesting. I haven't used yet symetry on Fusion 360.

My problem is exactly the one shown by @hamid.sh.

[dsouzasujay · Accepted solution]

@axel.dumas.kct  Thanks for reporting this issue!

@hamid.sh. for the explaining clearly with a video

I agree with you that this is a bug, But we do have other workaround for this workflow, reported as FUS-102353 in internal issue tracking system. Hope we get it resolve sooner. Thanks!

[axel.dumas.kct]

No problem @dsouzasujay.

Especially, thank you both for your very useful help and your explanations.
Sincerely.

PS : Thanks you for making Fusion 360.