Hi V5, how to sweep a helix inward during its next 360 deg rotation ? What method does this ? If one has a helix, how is the last rotation taken progressively inwards during the 360deg rotation of it. Such that any triangle thread on it vanishes into the inner solid its sitting around. Steve

Hi, FANTASTIC AND MANY THANKS…I CAN NOW PROGRESS. :star_struck: Now thats a neat trick, do some maths and establish cone angle. It needs to depart the helix tangentially and that would do so as well. Now someone needs to add that into a bolt thread making video ! Steve

Spiral command Rhinoceros Help - Spiral | Rhino 3-D modeling (mcneel.com)

[image] Steve1: how to sweep a helix inward during its next 360 deg rotation ? As @davidcockey said, it’s called a Spiral. See the Help for details on how to use it.

Hi, Thanks guys, so spiral would also do it. enter same pitch etc as helix and create the last turn. Which in theory is the easier to construct, the project to cone or the spiral matching the pitch and so on of the helix ? Cheers Steve

[image] Steve1: Which in theory is the easier to construct Spiral IMO…

Probably what Mitch said - especially after you’ve done half a dozen or so. Why not try both and let us know what you think?

[image] AlW: Project it on to an appropriately designed cone? Project does not work. Spiral Steve.3dm (2.0 MB) [image] Blue is helix Green is spiral Purple is helix projected onto cone Magenta is helix pulled onto cone

Creating a rectangular surface with a diagonal line, then flowing the diagonal line onto the cone also works. Result is essentially the same as Spiral. Spiral Flow Steve.3dm (2.0 MB)

Of course you are right. I spoke too soon. I was imagining “projecting” parallel to the cone’s base (perpendicular to its axis). But as you show that’s not how the project command (or, for that matter the pull command) works .

What method to progressively sweep a helix inwards in its one rotation?

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AlW October 22, 2023, 11:24pm 2

Project it on to an appropriately designed cone?

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What method to progressively sweep a helix inwards in its one rotation?

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