How to create a transition of two bodies' outer surface?

[kreatronik]

Hi,
I want to recreate a missing nozzle for my vaccum which looks like this:

So I made a sketch with a circle and ellipse sharing their center points. But now I don't know how to loft/merge the circle's top profile into the ellipse's face.

What would be an elegant way to solve this? Maybe I have to work with forms?

Thanks for you help 🙏

[jhackney1972]

Please attach your model so the Forum users can assist you better.  If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it.

[laughingcreek]

from the supplied picture, I don't think a loft is needed-

[kreatronik]

Hi John, Yes I usually do, but with this simple geometry and basically having generated only 2 simple bodies, I thought uploading the model wouldn't be of any help 😉

[jhackney1972]

Anytime we can skip doing the initial model is a help plus we can work with your units and dimensions.  Always attach your model and let the person answering it decide if they want to use it.

[Drewpan]

Hi,

I would start by creating a sketch on the upper surface of the circular tube and projecting the tube onto it to get the

profile.

Then create an offset plane where you want the loft to finish on the ellipse. Sketch and Project this body.

Now you have your lofting geometry, create the loft.

You might have to tidy up the bottom sketches first.

I did forget to trim the lower half of the ellipse section before I lofted, but you get the idea.

Cheers

Andrew

[etfrench]

Surface workspace loft, a couple of fillets, patches on the end, and lastly a shell command:

[g-andresen · Accepted solution]

Hi,

here are two more

günther

[kreatronik]

Thank you for all the ideas 🙏
Upon playing around, I found a faulty behavior in my design.
When I extrude the elliptical shape, the extrude tool deselects parts of the elliptical profile. Can you tell me, if this is a bug?

[g-andresen]

Hi,

As there are several profiles due to the overlapping of circle and ellipse, you must select the desired ones.

günther

[TrippyLighting]

I think the version that is closest to the photo you posted is from @laughingcreek.

Here is yet another version that doesn't need any other sketches. It also works only with a circle and an ellipse in one sketch.

[Drewpan]

Hi,

I don't think it is a bug where part of the ellipse is not selected. I think it is because the ellipse and circle overlap and

you need to fix this manually first.

Cheers

Andrew

[kreatronik]

Yes, I wanted to adapt the solution with the shell command and extrude the whole ellipse, for which I selected all of the according sketch primitives, which added up to the full ellipse. But I got this weird result. Please tell me, if you also get the same result as me, when you select the inner ellipse as well.

[kreatronik]

Thank you, very nice explanation.
Also I learned from that clip, that one can create user parameters right in the dimensioning dialogue 🤯

[kreatronik]

I just saw that after selecting all ellipse primitives, that there is a small red artifact, which must cause this problem:

So it is indeed a tiny overlapping problem apparently.

[g-andresen]

Hi,

It will (could) be, because there is no problem with Window select.

günther

[johnsonshiue]

Hi! Here is another solution using two extrusions and fillets, plus non-uniform scaling (in Z direction).

Many thanks!