Costrain (sp) line to a curve

[m.digristina]

Hi, I need to costrain that line to the 2 curves so that when I move it along the curves the endpoints remain touching the curves.
How can I do that?

[davebYYPCU]

Create a sketch plane, position can be edited.

create a sketch on that plane

Project > Intersect the 2 Rails you want to attach to.  Keep projected link, you get purple dots.

Connect curve to the purple dots (snap or coincident)

To slide the curve, edit the plane position.

Might help...

[m.digristina]

tricky, but a solution

Hope the Autodesk team will give us a solution

[davebYYPCU]

Tricky?

Certainly is with 3d sketch.

[jeff_strater]

If I understand your question, this should work exactly as you expect it.  I think that is what you are asking about. However, it does not work in your design, so I need to turn that over to the sketch team to figure out why that is.  I've recorded a screencast, but it is not processing correctly.  I may have to record it again.  Will post here when I have something...

[jeff_strater]

Screencast is not cooperating today, so here is an MP4 that shows that the basics do work.

[jeff_strater · Accepted solution]

and, here is the screencast:

[m.digristina]

Am I doing something wrong?

[TrippyLighting]

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@jeff_strater wrote:

If I understand your question, this should work exactly as you expect it.  

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Agreed, it probably "should" work, but it is still not a good idea to design this in a single 3D sketch.

When I see a user doing it here on the forum, it is almost exclusively done by users who have no experience in a modern parametric CAD system.

In any parametric CAD system I know, 3D sketches are reserved for specific purposes, e.g. piping, wiring, cables, etc., or perhaps to feed a frame generator.

It is definitely a better practice to create only those curves as 3D curves that really need to curve through space and not be constrained to a plane. All other curves should be designed in their own sketches, constrained flat to a construction plane. If Fusion 360 had a tool to planarize a spline similar to Autodesk Alias my recommendation might be differnt, but it doesn't.

[m.digristina]

I wanted to use one single sketch because it was simpler to modify all the points at once, and had to use a 3D sketch because I didn't want to create 20 sections for the hull of the boat

[TrippyLighting]

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@m.digristina wrote:

I wanted to use one single sketch because it was simpler to modify all the points at once, and had to use a 3D sketch because I didn't want to create 20 sections for the hull of the boat

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Understood. I stand by what I said!

Why would you need 20 sections ?

[m.digristina]

Because the hull changes many times, maybe 20 is too much, but 7 or 8 are needed
Can I move a point from one of the curves and have the change reflected to the point that is in the other sketch?