How do I close this sketch? (New to Fusion)

[gvok]

Hello. I'm brand new to Fusion360. I am designing a sketch and want to close of or validate the drawing. I have added dimensions and constraints but not sure how get the fit point spline to turn black. Any advice appreciated. Thanks

[etfrench]

You need to dimension and constrain the fit point arms the same way you would do any other line.  Control point splines are much easier to constrain.

[gvok]

Thanks for that super quick reply. I think this should do it. Used the fix/unfix for the curve centre point and parallel constraints for the ends. What does the yellow colour signify?

[etfrench]

The endpoints of the center control handles are shown as Fixed.  Using Fixed/Unfixed is the easy way to lock a fit point spline, but it isn't parametric, so making changes may be harder. 

[gvok]

Understood. Is there a better way to constrain the mid point handles versus fox/unfix? I am unsure if there are any other obvious ways to constrain them as the handles tangency / positions are somewhat arbitrary. 

[etfrench]

Just keep adding dimensions and constraints to the fit points and fit point handles 😁 

If you want the spline to be symmetric make all of the dimensions on one side equal the ones on the other side.

[gvok]

Ah I see. Thanks for that screen shot. That makes sense now.  Cheers mate. Thanks for your time!!

[Bunga777]

The reason this sketch is not fully constrained is that the position and orientation of the points indicated by the arrows are undefined.

The dimensions marked with a circle can be added to make it fully constrained.

 

An easy way to solve this problem is to try dragging the points that are not blacked out.

This will cause the sketch to move, and you will know that you are missing a condition at the point where the sketch is moving.