Loft issue - Surfaces don't align

Loft issue - Surfaces don't align

ekalyvio
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Message 1 of 5

Loft issue - Surfaces don't align

ekalyvio
Participant
Participant

I am trying to create the elevator pitch trim of a model airplane (tail).

I create 2 different loft surfaces (just for now - I will use solids later and cut them out). These surfaces are one inside the other. They don't seem to align correctly after creation and they create some kind of a seam between them... This seam is only on the middle on the surface and the start/end profiles don't have it.

 

Screenshot 2024-04-07 022829.png

 

Anyone having any idea what is happening and has that bump on the middle of the surface instead of just touching on the inside? There should be only a single touch point with the surface...

 

I attach the .f3d file in case it is needed.

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Message 2 of 5

jeff_strater
Community Manager
Community Manager

That is not a seam.  The loft surface is fine.  That is your cylinder surface bleeding through the loft surface.

 

with cylinder visible:

Screenshot 2024-04-07 at 6.32.41 AM.png

 

with cylinder invisible:

Screenshot 2024-04-07 at 6.32.49 AM.png

 

It may just be a graphics artifact, and the surfaces really are tangent.  It looks a bit like z-fighting to me, because it does vary with the camera angle.

Screenshot 2024-04-07 at 6.37.31 AM.png


Jeff Strater
Engineering Director
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Message 3 of 5

jeff_strater
Community Manager
Community Manager
Accepted solution

On second thought, maybe the surfaces are a bit inter-penetrating.  I added a few rail curves, and the issue seems to go away:

Screenshot 2024-04-07 at 7.22.22 AM.png

 

model is attached


Jeff Strater
Engineering Director
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Message 4 of 5

ekalyvio
Participant
Participant

ekalyvio_0-1712521665403.png

Oh, yes!!! It seems like they cut out perfectly horizontally when using solids apart from the surfaces that left behind on the small circle. I guess that this circle needs rail lines too...

Would you mind sharing how you created the other 4 rail lines without creating a new offset plane  and then doing some kind of intersection of the circles to this offset plane?

I had tried to do something like that but it drove me crazy. Functions on the Project/Include menu don't seem to do something like that. I seen that you somehow created the lines (blue) from the intersection of the circles with the horizontal lines.

 

ekalyvio_2-1712521876599.png

 

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Message 5 of 5

ekalyvio
Participant
Participant

Ah... never mind.

I found a very nice tutorial on internet that helped me understand how to create a 3D sketch!

https://www.youtube.com/watch?v=qGQgMADxoFU&t=46s 

Thanks!

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