topic Re: Constraint Errorbug for valid constraint in Inventor Forum

Constraint Errorbug for valid constraint

n_bonvin — Mon, 25 Mar 2024 10:53:33 GMT

Hello,

I keep having a problem in an assembly i'm working on and can't find a solution.

I have 3 variants of my model and 2 of them keep having a problem.

When I try to constraint "Echelle" in variant 1 and 3 it keeps telling me that there in as error in the constraint but when I accept it anyway there is no problem. Actually i'm sure the constraint is valid, i don't know why the error shows up.Ifonly it wasthat there would be no problem but then when I change the parameter "AngleEchelle" in the excel and update the whole assembly the part "Echelle" won't move untill I touch it with the mouse and move it a little bit.

I uploaded the whole file of my model. You have to open the file "AssemblageFosse" and the file "Paramètres" if you want to change the parameters. You can find the parameter "AngleFosse" almost at the end of the sheet Parametres on the excel file. I uploaded the file with the variant 1. You have to try to constraint the two points together in order that "Echelle" can move in the tube. I understand it is quite complex to jump in a project at this stage and hope I was clear.

Thanks for your help !

Re: Constraint Errorbug for valid constraint

CCarreiras — Mon, 25 Mar 2024 11:32:58 GMT

Hi!

I believe the problem isn't the constraints, but the errors in the sketches.

The problem in the constrains is a consequence of that.

Also, your files are not all migrated for the same version, this cause also issues to the model.
Use Task Manager tool to migrate all the files for the actual version.

I can't find the parameter in excel to change... anyway... i think you dont need 3 stairs in the model, i would use only one and vary only the angle for the same stair, this way i will avoid the "suppress" step.

Re: Constraint Errorbug for valid constraint

WillL84 — Mon, 25 Mar 2024 11:35:24 GMT

I have this error on occasion as well. I'll add a constraint to a part that doesn't have any and it gives me the error. I click OK anyways and it lights up the red +. Then when I drag the part it snaps to where the constraint is supposed to have it and the red + goes away and everything is fine. It's strange.

Re: Constraint Errorbug for valid constraint

CCarreiras — Mon, 25 Mar 2024 12:07:44 GMT

How do you control which "echelle" is active or suppressed?

Note:

"""I'll add a constraint to a part that doesn't have any and it gives me the error. """

If you have the red cross active due sick constrains, the new constrains you create will have that error message... even if they are well created... it's a odd behaviour, but it happens.

Re: Constraint Errorbug for valid constraint

WillL84 — Mon, 25 Mar 2024 12:15:37 GMT

But the thing is that if I drag the component it'll snap to where it was supposed to be and then the red cross goes away so there's no more error.

Re: Constraint Errorbug for valid constraint

CCarreiras — Mon, 25 Mar 2024 12:35:50 GMT

Sorry, but i can not replicate what you're saying.
Can you explain better?

Re: Constraint Errorbug for valid constraint

n_bonvin — Mon, 25 Mar 2024 12:42:19 GMT

Actually these sketches have errors only because I didn't find a way to supress sketches. So for example when i'm in 1 and 3 configuration the sketch corresponding to the 2 nd configuration will show errors because th egeometry doen't exist.

I don't get what you want me to do when you tell me to use Task manager. is there an auxiliary app to inventor called task manager ? Didn't find it.

I actually prefer to use 3 stairs than suppressing all the constraints. Because the stair can sometimes be attached to an other tube when i'm in the 3 Tube configuration for example.

This is the parameter to change to move the stair.

This is the parameter to use to change the configuration

Re: Constraint Errorbug for valid constraint

n_bonvin — Mon, 25 Mar 2024 13:00:50 GMT

Guys...

I don't know why. Before in configuration 1 and 3 when I constrained the "Echelle" part I could not move it around the tube axes even if I didn't constrain the "Echelle" along the radius line you see in the tube.

Now the only probel that remains but that is not that impportant is why is it still poping up these error messages even if the constraint is valid ?

(view in My Videos)

Re: Constraint Errorbug for valid constraint

CCarreiras — Mon, 25 Mar 2024 15:53:00 GMT

There's several problems to fix.

First, sketches can't be suppressed, so, you must find ways to deal with that to avoid the errors.
Second, the red cross is on (as you can see in my images). i couldn't not get rid of it (i tried rebuild, drag, etc, but it still on).

third, since the red cross is active (due sick constraints), you will have that odd behaviour when you create new constrains, even if they are well created, as you show in your video.

So...
I fixed both sick constrains (change them from flush to angle, i think is more stable for this case).
Fixing the sick constrains, the new ones will be ok.

Re: Constraint Errorbug for valid constraint

CCarreiras — Mon, 25 Mar 2024 15:50:55 GMT

Also the rotation will work ok:

SO.....
You need now to fix the sketches. A sick model (red cross) will always work bad, sooner or later.

____________________

Sorry, is "Task Scheduller" not "Task Manager".
Anyway, it's only one file that needs migration, so you can do it manually: open and save it.

Re: Constraint Errorbug for valid constraint

n_bonvin — Tue, 26 Mar 2024 09:04:25 GMT

Thanks a lot ! Yoou were right, fixing all the other issues that I considered as not important helped me to solve the problem.

Also the tick with the angle constraint in place of the flush constraint worked well.

I didn't find a solution to oveercome the problem that i cannot suppress a sketch. Do you have any idea ?

For the moment I stiill have the red cross for these sketches but everything work fine despiite of that.

Re: Constraint Errorbug for valid constraint

CCarreiras — Tue, 26 Mar 2024 10:30:00 GMT

@n_bonvin wrote:

I didn't find a solution to oveercome the problem that i cannot suppress a sketch. Do you have any idea ?

For the moment I stiill have the red cross for these sketches but everything work fine despiite of that.

You can let models with the red cross activated, sooner or later the problems will grow badly, and you will conclude that you spent tons of work hours for nothing...
Every time the red cross appears, it have to be fix immediately.

Regarding the "suppress sketch" theme... well, you have to follow the operations one by one and fix it.

I would check all the model and find alternatives.
Example, don't use projected geometry from features that could be suppressed, or you will loose those references ahead in the model.

Re: Constraint Errorbug for valid constraint

CCarreiras — Tue, 26 Mar 2024 12:20:09 GMT

~~This feature.... is really needed?~~

OK, I GET IT...

Re: Constraint Errorbug for valid constraint

CCarreiras — Tue, 26 Mar 2024 12:23:59 GMT

HI!

The part is fixed...

Check the part attached.

Re: Constraint Errorbug for valid constraint

n_bonvin — Wed, 27 Mar 2024 06:55:36 GMT

I get what you told but in my case I NEVER use lost projected geometry because if it is lost it means I 'm not in this cinfiguration so I don't use it anyway. If it doesn't work this way I 'll have to replace each projected geometry in the sketches by a parametre driven sketch.

I hope that such a feature will be added to inventor because it is already working well when for example you build a feature 2 on the face of feature 1. When you suppress feature 1, it will automatically suppress feature 2.

Re: Constraint Errorbug for valid constraint

n_bonvin — Wed, 27 Mar 2024 06:57:35 GMT

I get this when I open your part ...

Re: Constraint Errorbug for valid constraint

CCarreiras — Wed, 27 Mar 2024 11:33:22 GMT

Well... i fix the model for one configuration, i was expected that you fixed for the others.

Anyway, it's all fixed now:

Tips:

Always project geometry from the main sketches, don't project the solids that can come and go, when they go, you will loose the references... obviously.

Stop creating new sketches with the same info, use existing sketches (even the main ones) to do the operations, they already exist.

The main sketches are signed in the image below.

Re: Constraint Errorbug for valid constraint

n_bonvin — Wed, 27 Mar 2024 12:14:41 GMT

Oh yeah thanks for that advice, it definetely resolved all my problems. Thanks a lot !