# Rifling or helical vanes on non-straight funnel?

**URL:** <https://discourse.shapr3d.com/t/rifling-or-helical-vanes-on-non-straight-funnel/35462>\
**Category:** Modeling Questions\
**Created:** [December 4, 2024, 11:11pm UTC](https://discourse.shapr3d.com/t/rifling-or-helical-vanes-on-non-straight-funnel/35462 "2024-12-04T23:11:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![B3nn](https://avatars.discourse-cdn.com/v4/letter/b/b19c9b/32.png) [@B3nn](https://discourse.shapr3d.com/u/B3nn)\
**Post date:** [December 4, 2024, 11:11pm UTC](https://discourse.shapr3d.com/t/rifling-or-helical-vanes-on-non-straight-funnel/35462/1 "2024-12-04T23:11:59Z")

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I’m trying to figure out the best approach to create rifling inside a funnel.  
If I make a rifling feature and rotate the base around the funnel axis, the path doesn’t maintain the contact to the funnel surface.

Any suggestions to accomplish this on my iPad

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**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [December 5, 2024, 12:11am UTC](https://discourse.shapr3d.com/t/rifling-or-helical-vanes-on-non-straight-funnel/35462/2 "2024-12-05T00:11:09Z")

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Here’s one way. It is rather quick and dirty but it may give you some ideas.