Duct fittings with an angled connection

[luisangel.gonzalezb]

Hello,

I'm trying to make a industrial duct fitting with a angled connection, but i cant make the extrusion to connect the  rectangle base with the top circle. 

Any idea how to do it?

[RobDraw]

Please share what you have tried. This helps in not duplicating efforts.

I thought a blend would work but it requires to top and the bottom to be parallel.

Have you tried a "creative" approach using a swept blend?

[robert2JCCH]

Blends and Swept Blends will allow you to transfer from a circular profile to a rectangular profile, but you're going to quickly run into some limitations in the family editing environment.

Blends use a single reference plane - you can't angle the bottom plane relative to the top plane.

Swept Blends follow a path - you can draw a spline that sort of approximates the transition in angle but neither the top plane nor the bottom plane will actually be correct. 

You might find better success using another geometry environment like Dynamo or Solidworks, then pulling in the geometry and applying connectors afterwards....you won't be able to constrain dimensions, so it's up to you what's more useful to your workflow (flexibility vs fabrication-quality)

The conceptual massing environment has the degree of flexibility you'd want for the angled form, but I'm not aware of the workflow to get that form into the duct fitting category afterwards.

[ToanDN]

Edit: reuploaded file with a correction for proper constraints.

Try this. 

The top round, the bottom rectangle, and their planes should be correct so that you can connect it to ducts properly.  The wall is not exactly like what you show (straight edges) but you could use details to draw how it should be fabricated exactly.

Or, tell them to fabricate this shape and let them come back with the alternate, which is shown by the shop drawings, at which point you can approve it.

[RobDraw]

Could model lines be used to give the appearance of edges?

[luisangel.gonzalezb]

Sure, I tried with swept blend but doesn't work

[ToanDN]

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@RobDraw wrote:

Could model lines be used to give the appearance of edges?

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Maybe a couple but not like what he shows because the wall is 3d surface.