Unable to compute a Solid Sweep when the Solid contains a loft

[simulatedsyrup]

I'm working on a lever (more complicated than in the picture, but distilled down to the broken element) that rotates around a pivot point, while inside another body. I'm trying to remove the volume from that other body necessary for the lever to pivot.

The solid sweep seems like it's supposed to be exactly the tool for this, and it works just fine if I use an extrude thats very similar in shape to what I need. However, I need more of a lofted shape (seen here, created with a loft / centerline), which causes the solid sweep to fail, no matter what.

Even if I try splitting the loft into multiple parts — even ones that are effectively just a flat extrude! — Fusion throws an "the operation failed, try adjusting the values or changing the input geometry" error. The solid sweep does work with the loft, however, if the path is a single, straight line. But being that it needs to pivot, I need the path to be a short arc.

I'm new to fusion — I'm not sure how to get the shape I need. I'm racking my brain and googling but not coming up with much. I tried using a sweep with rails and a stretching profile to create the shape, which didn't work either. Why wont this work, and how can I accomplish what I need?

I've attached the example file

[TheCADWhisperer]

@simulatedsyrup 

Do you have a picture of something similar that already exists in the real world?

We can make a lot of progress on this in a short period of time.

[simulatedsyrup]

No pictures of the real world, no. This is what I'm trying to accomplish — although this uses the extrude (flat bottom), whereas I'm trying to use the loft shape (progressive taper along the spine of the lever)

[TheCADWhisperer]

@simulatedsyrup 

I don't see that geometry Attached here?

None of your sketches are fully defined.

Who created the geometry in your latest picture?

[simulatedsyrup]

No sorry, like I said, I distilled the example file down to only the issue itself, to avoid complication. The rest of the geometry is mine — that other geometry isnt the issue. The sketches arent fully defined because they were taken from this larger file, which contained the references. But even when fully defined the issue I explained in the first post still occurs.

[TheCADWhisperer]

@simulatedsyrup 

Can you create a clean file from scratch illustrating only your issue? (You stated you are new to Fusion and the original file looks like a first 10 minutes using Fusion, now that you explain a bit that it came from a larger file, it is a bit less questionable. (Missing Tangents, dimensions, Horizontal Constraint...))  

Can you search the internet to find anything that looks remotely similar to what you are attempting to model?

[simulatedsyrup]

I've just tried to accomplish this a completely different way, and again, it fails. It seems to be anything with rails or a centerline that is the issue.

Here, I tried sweeping a profile line along a path to create a surface. I then thickened the surface, to create a body. This body is then successfully able to be solid-swept. However, if I use rails with the initial line sweep, to get the angled shape I need along the path, then thicken, the resulting body is unable to be solid-swept

[TheCADWhisperer]

@simulatedsyrup 

My best guess.

Is it close?

[davebYYPCU]

Wants to use a bracket, in a solid Sweep > cut into material to create the cavity.  Lofted brackets don’t work.

Might help…..

[TheCADWhisperer]

@davebYYPCU 

Got it!

[laughingcreek · Accepted solution]

in your original attachment, your loft created geometry that is more complicated than you intended.  (you can see in the curvature combs that the surfaces that should be dead flat have a lot of wavey-ness to them.  the object seems simple but as far as fusion is concerned,  the geometry if extremely complicated.  this happens frequenlt when trying to loft flat sections together with curved sections all in one go.

you where on the right track to try sweep, b/c sweeps will usually create less complex geometry than loft.

in order to achieve the shape you're after, I used a Sheetmetal body.  see attached.

[simulatedsyrup]

That's perfect and exactly what I was looking for, thank you very much!