How do I loft this face to follow the other spline face and add to the 3D body in image below?

[robsteelWCERV]

In the design below. I am trying add to my 3D body. Essentially, the sketch face selected below would be extruded to follow the perpendicular spline and connect to the face of this 3D body. I'm really struggling with this concept. Could someone please give me some guidance? I feel like if I can just figure this out my Fusion 360 Knowledge will go to the next level. 

[davebYYPCU · Accepted solution]

Use Split Face, to make a profile both sides of profile 2.

Loft 1 to 2 to 3, with centre  rail as a Rail.

(Might be better done before the top and bottom fillets.)

Might help.....

[jhackney1972]

If you have issues, attach your model so a Forum user can step you through the process you are asking for.  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.

[robsteelWCERV]

I seem to have it working. It wouldn't work by just choosing the loft command, then selecting face 1, then face 2, as it wouldn't then let me select face 3. What I did was multi select faces 1 2 and 3 first, then with those selected I started the loft command. Then I selected the rail, but the first time I selected the rail is complained about the rail not intersecting the planes. then after some adjustments, I arrived at the desired result. If I was hiring for a Fusion 360 modeler, I would ask them to complete this loft to see their understanding of the loft command. 

[robsteelWCERV]

There is a flaw in my model, can you see it? not how after the LOFT it doesn't exactly follow the rail? Note how it's not symmetrical and is fileted on the right side but pointed on the left? It's like the loft didn't follow the rail exactly. What can I do to make this symetrical?  Here is a link to the model if you want to play with it.   https://a360.co/3IpNE0f   

[davebYYPCU]

Edit, checked your file, other than loft is finicky.

Can't explain it.  I am not able to get anything better than your version with my tricks,

Not behaving as expected., for dummy faces, surface loft, and half model for symmetrical mirror, with or without fillets, nothing works, and I put it down to that geometry is not possible.

Your sketch 1 spline is not strictly symmetric, mirror it and you get close but not exact.

Might help....

[laughingcreek · Accepted solution]

I don't know if it's a loft bug, or just a limitation of the geometry kernel, but I've noticed that many times (most times?) lofts like this won't loft symmetrically.  difficult spline curvature, lofting over a horizon boundary, and rails/profiles that have both straight and curved sections can all contribute to the difficulty in lofting.  put all those things into the mix, and sometimes the asymmetry/difficulty is enough to create illegal surfaces and the tool completely fails.  breaking the loft up into parts, and using surface instead of solid lofting can frequently overcome the issues. 

attached is how I would do it, here is a pic with the new timeline features highlighted (I redrew the profiles.  not strictly necessary to get it to work, but your splines where hurting me)-

[davebYYPCU]

Dang, double mirrors never popped into my head.

[robsteelWCERV]

Kevin, thanks so much. This would be a great advanced level lesson to add to PDO. I like how you simplified the loft and used mirrors to complete the body. It seems it’s important for learners to understand that LOFT is not an exact tool, that it approximates. It would make a great video to go through the consequences of when to use curvature, tangent, connected, etc. as I don’t think very many people really understand those options. People I’ve talked to about it tends to just change the setting until they find a combination that lets them press the OK button.