topic Re: Constraints not updating in Fusion Design, Validate & Document Forum

Constraints not updating

ericschimel — Sat, 24 Dec 2016 16:28:51 GMT

So I have this model that I'm working on and for reasons that are beyond me I cannot get the "Plywood" constraint to work consistently.

I model a fair bit of things like this and I've noticed that if I have a complex sketch that Fusion gets incredibly slow recalculating the constraints. I ran into that again on this model and the only solution I've found is to break up my sketches into tiny parts so I don't get so many failures.

Ideally I'd like to have one master sketch to drive all of my components, this would make things a lot easier because I could do a lot of referencing from part to part. Because I have to break my sketches up into smaller bits I'm forced to make a lot more attributes to reference across sketches.

In this particular case I cannot get the "Plywood" attribute to recalculate. If you check the screen cast you'll see that I get an error in "Sketch 5" when I try and use a different plywood number:

http://autode.sk/2hmOAI6

Oddly though when I go into the sketch and simply double click the dimension and hit "enter" it all works again...

Am I seeing a bit here, or do I have a poor approach to doing what I need to do here?

Re: Constraints not updating

jeff_strater — Sat, 24 Dec 2016 17:15:30 GMT

thanks @ericschimel for reporting this. The combo of the video and the model made it very easy to reproduce the problem. We really appreciate that level of effort.

I will file a bug for this and have the team look at it. I've also found that when you hit this problem, an Edit -> Compute All seems to fix the problem, and is easier than editing the sketch.

Jeff

Re: Constraints not updating

TheCADWhisperer — Sat, 24 Dec 2016 17:25:07 GMT

@ericschimel wrote:

Ideally I'd like to have one master sketch to drive all of my components, this would make things a lot easier ...

Here are my preferences.

I too like to use a master sketch - but I only define the basic extants.

I try to never duplicate work in sketches (I see an awful lot of duplication in your sketches.

Pattern features, not sketch entities and certainly not sketch dimensions.

I prefer to make use of symmetry about the origin in my sketch and use = constraint rather than duplicating dimensions.

I fully define all of my sketches.

I think the number of dimensions you are using can be significantly reduced.

Re: Constraints not updating

ericschimel — Sat, 24 Dec 2016 23:07:47 GMT

Thanks @jeff_strater!

@TheCADWhisperer You're right that the sketch could be reduced in complexity, I actually imported that one as a DXF and it came in completely un constrained so I had to constrain and dimension every line to make it work. I did as much symmetry as I could... I've found that using mirroring in sketches isn't that reliable, so usually I just sketch half or a 1/4 of what I am making a solid, I extrude it and then combine it back together.

What would you recommend I do to make this sketch a bit better? Make a master sketch and then project for each individual part?

Re: Constraints not updating

ericschimel — Sat, 24 Dec 2016 23:50:28 GMT

Hey @jeff_strater where are you seeing that "Compute all" button?

Re: Constraints not updating

TrippyLighting — Sat, 24 Dec 2016 23:56:53 GMT

This is like your design quality control.

Re: Constraints not updating

ericschimel — Sun, 25 Dec 2016 18:14:26 GMT

Thanks @TrippyLighting. So I'm hitting "computer all" both in, and out of the sketch and it's not re-computing unless I double click on the dimension and hit enter again...