topic Re: Spline around 3d box in Fusion Design, Validate & Document Forum

Spline around 3d box

cornell1980 — Sat, 15 Jul 2023 00:35:31 GMT

I have a simple box and would like to draw a continuous spline around all four surfaces. I can create a spline on one surface (sketch), let's say the left, then turn and create another spline on the front sketch and start and stop them at the same place on the corner and it kind of looks like they are a continuous spline but they aren't really. I've attached my file so maybe looking at it will make more sense. Ultimately I want to create a small pipe around the box for decorative purposes. Can anyone help?

Thanks

Tim

Re: Spline around 3d box

jhackney1972 — Sat, 15 Jul 2023 00:52:48 GMT

Since a Spline has a natural curvature, it is very hard to keep in exactly on the surface of a sharp cornered box. Attached in your model with a continuous spline around it but as I say, it dips in and away from the exact surface.

Re: Spline around 3d box

cornell1980 — Sat, 15 Jul 2023 08:51:18 GMT

Let me change the example. Let's say instead of a box it is a cup. How do I draw a continuous spline all the way around the cup?

Thanks

Tim

Re: Spline around 3d box

HughesTooling — Sat, 15 Jul 2023 09:14:11 GMT

Is the cup a continuous surface? If it is create a plane where you want the curves then a sketch on the plane and use project intersect Shift+P.

Re: Spline around 3d box

Warmingup1953 — Sat, 15 Jul 2023 09:51:29 GMT

That might be easier! What are you trying to achieve?

Re: Spline around 3d box

davebYYPCU — Sat, 15 Jul 2023 11:26:33 GMT

Easy enough, but not with sketching. Box is the same.

Might help....

Re: Spline around 3d box

g-andresen — Sat, 15 Jul 2023 14:55:05 GMT

Hi,

what you need is a small fillet between the faces.

Try this

(view in My Videos)

günther

Re: Spline around 3d box

cornell1980 — Sun, 16 Jul 2023 01:35:47 GMT

I'm trying to make a cup/lattern that has decorative lines going around
it. I tried unfolding the cup, drawing the splines, then refolding the
faces, and that kind of works...

[image: image.png]

But as you can see when the refold occurs the splines don't meet up or
appear smooth.

[image: image.png]

Any advice would be appreciated.

Thanks
Tim

Re: Spline around 3d box

Warmingup1953 — Sun, 16 Jul 2023 02:05:07 GMT

No images inserted or attached

Re: Spline around 3d box

TrippyLighting — Mon, 17 Jul 2023 17:57:54 GMT

As I am sure you've discovered by the replies so far, sketching directly on a curved surface is not possible in Fusion 360.

This is fairly advanced functionality called COS or curve-on-surface and I don't expect for this to be implemented any time in the foreseeable future.

The sheet metal method of "wrapping" a curve around a developable surface, however should get you there. It might simply be a case of applying the technique correctly.

Once you manage to properly attach a .f3d model to a post I am sure we can demonstrate how to do this.