Sketch constraint over constrained

[dmcgovern_]

So I am a student, and we are using fusion 360 in our class. We are following the learn autodesk fusion in 30 days program, and my problem is day 2 slwith the bottle. At the very top of the bottle I have a solid line and the guy said to make sure it's constrained, qnd so I do that but then it says it's overconstrained. Does this mean that it's already been constrained? I really do not understand this

[g-andresen]

Hi,

Please share the file for reply.

File > export > save as f3d on local drive  > attach to post

günther

[jhackney1972]

I identify a line, from the video, that I believe you are speaking off.  In Fusion, if you sketch a line in a horizontal direction, it will apply the Horizontal Sketch Constrain for you.  This happens automatically if you do not hold down the Ctrl (or Command) key while sketching.  If you see the horizontal sketch constraint symbol and then try and apply another Horizontal constraint, as he suggested in the video, it will give you a warning that the line is already constrained.  This is what probably happened to you.  Just ignore it and move one.

[Drewpan]

Hi,

Constraining a sketch is one of the most important things for your design to avoid problems and errors down the

track. Normally a sketch with  blue lines and open points is unconstrained. You can tell by the little pencil icon on

the sketch in the browser tree too.

A sketch is fully constrained when everything turns black and there is a little lock icon in the browser tree instead.

Sometimes fusion will put constraints in for you and sometimes you have to do them yourself. A constraint is either

a dimension like the length of a line or n angle between lines. Sometimes it is an actual constraint like the centre

of a circle co-incident with a line.

Some dimensions are hard to work out. A line might look vertical but it might be just a bit crooked. A Horizontal/

Vertical constraint will fix that. Sometimes a line might look tangent to a circle but it is only co-incident to a circle

so you need to define where it joins with a tangent constraint.

Every piece of geometry you sketch will need to be constrained. This includes construction lines. Any point or line

hanging in space needs to have an exact location in reference to some other constrained geometry. A point might

be constrained as a vertical and horizontal distance from the origin.

All of the different constraints are here.

I know that you said that you are doing a video course but if you really want to learn fusion, check out the Rule #0

post pinned to the forum. It will give you a great guide. The tutorials embedded in the documentation are really

simple and the self paced learning is great. Trust me - any time spent doing this stuff will never be wasted if you

want to learn this software.

Couple of last things. When checking a sketch for unconstrained points, look for blue lines and points that are open.

If you think that something needs to be constrained but it throws up an over constrained error then look for

something else. It might just need a dimension.

The little grey icons are the constraints you have already. There is also a Text Command to help you find

unconstrained geometry. Sketch.ShowUnderconstrained.

This command will help you find unconstrained stuff easier.

Cheers

Andrew

[CGBenner]

@dmcgovern_ Hello, do you still need help with this question?