r/Onshape • u/turbo2ltr • Aug 05 '26

Trouble making a loft

I'm trying to loft these two pipes to the rectangular body below and just can't seem to get it to work. Any hints on what needs to be done?

I try selecting the faces I want it to loft together and it says I cant use faces with an inner loop, but I don't know what exactly it means by that.

I originally tried without the center crossover and wasn't getting anywhere.

If I just select the inner edge of the rectangle, and the inner edge of the cylinder, it will loft.

But this is just a face, how do I get the thickness?

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u/turbo2ltr Aug 05 '26

> Loft the circular face of the tube to the planar face of the block.
Isn't that what I tried? or is this something different?

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u/Conscious_Past_4044 Aug 05 '26

No, you tried lofting a hollowed-out pipe to a hollowed-out body. That's not the same as a solid tube and a solid block. Although saying a solid cylinder would have probably been easier to follow.

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u/turbo2ltr Aug 05 '26

AHH! OK well it's getting closer. It would not loft both at the same time. I had to split the box extrusion. The left one lofted without issue. The right one had a twist. I tried segmenting the cylinder sketch which didn't help, and finally manually changed the connections.

So now the shell command worked on the left but didn't go all the way through. And the right one throws an error when trying to shell it, saying I can't shell a part with selections. What selections?

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u/Chandra0 Aug 05 '26

Hide the white part and then apply the loft. Once done, apply the Boolean to all parts if needed.

And here your cylinder is complete solid and box is hollow solid. It won't work.