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Helix with variable pitch

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hello, is there a way to draw a helix (NX11) with variable pitch controlled at given points? I need to have 8 turns, first 2 turns with pitch1, 3rd with pitch2, 4th and5th with pitch3, 6th pitch2, 7th 8th with pitch 1.

I have tried with the option 'linear along a spine', but I only get the first two precise, the others are not (see red arrows, image below). I also tried 'by law curve' but didn't get the expected result.

Thank you for good tips!

HELIX.png


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