Autodesk Inventor Users

the only solution is loft.

Thanks. But using the loft, how can I make this transition?

Extra Sketch in the middle of the missing part....making 2 loft?

Edit: Extra sketch right on the mark where the model is thickest

Make centerline instead of 2 guidelines...and 'just' use loft?

Or do i miss something?

Hola Josué, necesitas hacer una transición entre tubos (desarrollo de codos) o lo que necesitas un solido continuo...?

the loft command is the best as mentioned before

just create 3 sketches as following

1- perpendicular on first section

2- perpendicular on second section

3- connect between of them by using 3D sketch and draw line using spline

finally , use the loft commend easily

You can do it >>this way<< too.

Why did you delete the faces just to stitch it back together? And then all you have is a stitched surface and not a solid. Skip those steps.

Just directly loft it with the tangent conditions and be done with it.

Why did you delete the faces just to stitch it back together?

Sometimes Inventor decides to use the wrong face (the end face) to build the tangentiality.

Not often, but if so it can be a long way try and error to get the expected result. Therefore to avoid this I deleted the end faces before creating the new Loft. 

But the mainly I wanted to show, that we don't urgently need a transitional spline.

all you have is a stitched surface and not a solid

If that happens you can use the sculpt command to get a solid. In my example (Inventor 2022) the result of the stitch command was immediately a solid.

You can solve the issue with a sweep too (if the given end sections are circles). 

Draw a path spline between the two given end sections Diameter_1 and Diameter_2. Add a dimension to the spline length as Reference Parameter Now sweep one of the sections along the path, using a taper angle atan(( Diameter_1 - Diameter_2 ) / PathLength / 2 ul).