Driven Dimensions

[Fleiscal01]

Is there a way to view which constraint/dimension is driving another? I'm working through this tutorial : Fusion 360 Help | Activity 2: Add constraints (autodesk.com) but my sketch is fully defined before I put in the 17mm radius for the arcs. I'm thinking its in my constraints somewhere but I'm having difficulty finding where. Any advice/resources on fully defining sketches properly would be very appreciated 🙂

[g-andresen]

Hi,

Please share the file.

File > export > save as f3d locally  > attach it to the next post.

günther

[Fleiscal01]

oops, Sorry about that I thought a screenshot would suffice. Here you go 🙂

[davebYYPCU · Accepted solution]

Screen shot was ok for me, but files eliminate the guessing, 

Delete the 11 mm dimension, click drag a short horizontal line, if the 6 construction lines remain connected, you will have to unhook the coincident constraints holding them together.

If the lines are not coincident, you will get the 17 radius no problem, then replace the 11 mm dimension.

Might help....

[Fleiscal01 · Accepted solution]

Ah! I found it finally! There was a perpendicular constraint with the edge of the cutout and the construction lines for the rectangle I must have automatically applied by accident. That solves that, but is there an easier way to find a mistake like that or is it mostly practice/knowing what to look for?

Thanks for your time!

Abbey

[davebYYPCU]

At the time I responded your file was not there, 

It was what’s wrong with this picture?  

the very neat intersection of the top outlet lower line, 

The tutorial did not have the outlet outline neatly connected to the rectangle construction lines.

Perpendicular would not matter, without the 11 and 17 dimensions, the outlet shape should not connect to the rectangles construction lines.  Yep experience of Fusions Automatic helpfulness.

[aesilky]

I would really like an answer to his more general question (not so much how to fix his particular problem)...
When trying to apply a constraint or dimension, and it says that it will 'over constrain' or be a 'driven dimension', is there any way to find out why? Can I get a list of the constraint(s) or dimension(s) that are causing the 'over-constaint' or 'driving the dimension'?

In some cases, the constraint or dimension that I'm trying to add is the one that is important, and I would like to remove the other(s).

[davebYYPCU]

Without a picture of the sketch?

If the over constrain warning pops up, there is something doing that job for you, most constraints are aligned to the article it belongs to.  Clicking the constraint icon, will / should highlight the involved articles.

Might help....

[aesilky]

I posted a separate question on a related topic.

In a complex design, where things are related to other components, the constraints don't (or at least don't seem to) necessarily show up in the current sketch. Given that, how can one tell what is constraining a certain item?

[aesilky]

Here is my sketch:

The '(1200)' dimenion is being driven by something that I probably placed in the early stages of the design. At this point in the design, that dimension must be a 'key' demension (dictated by racing rules). I want to drive this dimension by a parameter that I have defined. However, I can't specify the value because this dimension is 'being driven'. I need to determine what is 'driving' this dimension, and make this dimension, in this sketch, the 'driving' dimension.

[davebYYPCU]

Purple Geometry.  Changes to the 1200 in the previous sketch so the wheels will adjust in this one.

Might help....