Over Constrained Sketch error message when it isn't!
How would you determine hat this sketch isn't over constrained?
My recommendation would be to break this sketch into several smaller sketches and also avoid mirroring too many sketch objects.
@oyaroygoldman wrote:
Do you think the sketch mirroring I did is the problem?
(Almost) never ever use sketch mirror. Not necessary.
Mirror Features, Faces, Bodies or Components instead.
Duplicating dimensions is unnecessary work too.
Using Thin Feature Extrude and Mirror of Feature you could dramatically simplify this sketch.
White dots and blue lines should keep you awake at night.
Repeated dimensions like this are a sure sign that you are doing too much work.
And wayyyy too many symmetry (mirror constraints).
How much interest do you have in learning to do this right? (I ask this question because most beginners I ask this question quickly abandoned the discussion.)
Thin Feature and Feature Pattern (Feature Mirror is a type of Feature Pattern) will become your best friends.
@oyaroygoldman wrote:...I still can't understand why that one line couldn't be defined.
This same issue comes up here very frequently - there have been a "rash" of posts on this just in the last 3 weeks.
Any sketch that has this many symmetry constraints is unstable and unpredictable.
Users get mad at me or mad at Fusion. Rest assured that there is a more computationally efficient technique that is less work for Fusion and far less work for the designer.
That's ok. I appreciate all your help so far. I have already completed this part of the design, and unfortunately I am not allowed to share the whole model. When I have time I will create a new project with similar challenges - if you would be open to looking at that one, I would appreciate it but no problem if that's asking too much. You have already been helpful.
I was hoping someone would be able to explain why I got the Over Constrained error I did in the first place (I understand that I made too complicated of a sketch - what I don't understand is how otherwise unconstrained elements couldn't be constrained, or how previously constrained elements wouldn't allow themselves to be constrained even when I released all constraints applied to them.
When it sounded like you were saying that you could mirror things without adding work planes, I was keen to learn that trick, but it sounds like this project - which has a lot of symmetry across different areas - is one that requires some additional work planes, which is a little more messy for me, but sounds much simpler for Fusion to calculate.
Since you asked, this project is a scroll worked gate that doesn't look like the one shown (for IP reasons) but has similar symmetry requirements.
