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LOFT TRANSITION: Help with best practice

mwesse
Enthusiast

LOFT TRANSITION: Help with best practice

mwesse
Enthusiast
Enthusiast

I have a very low angle in a rectangular>circle loft

 

I have fiddled but Im a bit lost as to how to get smooth transition to the centre hole; its just plain ugly!

 

mwesse_0-1701308022488.png

mwesse_1-1701308056696.png

 

 

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TheCADWhisperer
Consultant
Consultant

@mwesse 

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

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mwesse
Enthusiast
Enthusiast

Sure

I did try with some other solutions but the loft just didnt behave as expected...ultimately knowing how to solve this simple issue is consequential to understanding the loft process in detail

 

It still leaves the fillet issue as in my other post except now it only allows a 1mm fillet ie in this position in history

 

I did try a 3 step loft as variation but no matter how I wrestled the tangency, I could not get it to work. 

mwesse_0-1701375686851.png

 

 


Have attached that as well

 

 

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TrippyLighting
Consultant
Consultant

@mwesse wrote:

...ultimately knowing how to solve this simple issue is consequential to understanding the loft process in detail

 

 

 


Your understanding of the issue is the problem, as this isn't simple 😉

To our eyes and brains this looks like a simple problem, but under the hood, for the CAD system the loft is not simple as it is very shallow and also very skewed to one side of the geometry.

You might be able to improve the loft surface with a couple of rails, however, a loft from a circular to a rectangular profile will create 4 surfaces, which might look tangent to the naked eye but aren't truly tangent .

When you then try to fillet all edges at the same time, but do not select the edges between these 4 loft surfaces  then Fusion 360 creates the fillet you shared in the other thread.

If you do select that edge as well, then you'll end up with a 4-edge situation that sometimes can be solved, but not in this case.

 


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mwesse
Enthusiast
Enthusiast

Hi Peter

Thanks for your reply

Very funny as I was just watching your very detailed youtube vid on tangency... Great work and added huge perspective.

I just thought there would be more tools to augment and refine the transitions 🙂

 

I have got a better base going now but still end up with the fillet issue...bit frustrating

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TrippyLighting
Consultant
Consultant
Accepted solution

Here's one approach:

 

Plug Fillet Issue trippy.png


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mwesse
Enthusiast
Enthusiast

Brilliant!
Thanks as that makes it very clear as to some of the limitations.

 

Vielen Dank!

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