Lofting creates unwanted seam in part

[sfsa224]

I am trying to loft a 2D sketch to a 3D sketch whose geometry was projected onto a solid surface, with two rails up the sides. But whenever the loft creates the solid, instead of meeting the upper solid to make one continuous body, it has a "seam" that curves, roughly following the center line down the entire part. I believe this seam is where the solids separate infinitesimally, because when I try to fillet the edge where the bodies meet, one side works as expected, but one side fails.

This seam can only be seen in the wireframe view. Looking at the solid object, nothing appears out of ordinary.

How can I solve this issue?

(Inventor 2019 Pro on Windows 10)

Top view of my model. The problematic seam is highlighted

[WHolzwarth · Accepted solution]

Creating the Bottom Shell as separate body and thickening by a small amount helps. After that a Boolean combine and Delete face with healing at the overlap.

2019 IPT in Zip.

[johnsonshiue]

Hi! Like Walter mentioned here, I would create Loft Surface instead. Extend the edges a bit so it has a clean intersection. The issue with the Solid Loft is that the faces may not be intersecting with the main body properly, since there is not constraint to enforce that. The surface body allows you to control the intersection better. Lastly, use Sculpt command to turn it back to a solid body.

Many thanks!

[teranceU3ZEE]

Hello, I have a similar problem with my geometry. The loft is created between a 2D sketch and a 3D sketch whose geometry was projected onto a solid surface. The only difference is that it is a center line loft and not along the rails. The center line is a 3D spline created by projecting two 2D splines onto each other.  I tried correcting it with the methods mentioned above and was unsuccessful. I have attached the picture and model below.

(Inventor Professional 2022 on Windows 10)

[johnsonshiue]

Hi! The edge is called Seam Edge. It is created for spline faces in order to keep topology consistent. There is no way to remove it.

Many thanks!

[teranceU3ZEE]

Thank you very much for clarifying.