I imported this into Rhino from an iges file. I removed the flange and would like to extrude/join in the center of the gap but following the arc. My efforts to far have failed. However, I’m certain Rhino has a tool for this but no sure which is best. [EXTEND]

Well, if the outer rim is joined to the spokes - that is to say that there are holes cut into the tube, then extending the edge via subobject selection of the open edge with revolve about the center to meet the other will probably fail with a bizarrre result. The cleanest solution might be to remak…

Try Sweep1 with the arc curve as the rail (selected in the gap) and the two surface ends as the cross section curves. Let us know if it works. If it does not work I have an idea of what may be needed to make it work.

[image] CalypsoArt: However, I’m certain Rhino has a tool for this but no sure which is best. Experiment!

If the surface was a single ring, then try what Pascal Golay suggested above - “Untrim”. You can also fill the gap with the following tools in Rhino: Blend surface, Sweep 1 rail (suggested by David Cockey ), Sweep 2 rails, Loft…

You all forgot to mention the best tool: _PostGeometryToForum

[image] Gijs: You all forgot to mention the best tool: _PostGeometryToForum Yep, I did mention the other one in my first post - _HardToSayForSureWithoutTheFile

if the radius of the pipe was circular i would extract the isocurve then use arcblend then sweep.

Whoohoo, BlendSrf is what I was hoping would work. I’m unsure if the blend continues along the curve of the tube surface or if it is straight? (The ring – which I did not create – actually looks faceted.) The option box opened with “curvature” selected. Am I correct in assuming Rhino is recognizing …

Which tool to close this gap?

Rhino Rhino for Windows

CalypsoArt February 24, 2020, 10:19pm 6

I know remaking the outer rim would be easiest. I was hoping to learn another method. Nothing I tried worked, and couldn’t spend more time on it. Remade the outer tube with sweep1.

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Which tool to close this gap?

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