# Trying to create a perpendicular helical slot

**URL:** <https://discourse.shapr3d.com/t/trying-to-create-a-perpendicular-helical-slot/25598>\
**Category:** Modeling Questions\
**Created:** [May 2, 2023, 3:03am UTC](https://discourse.shapr3d.com/t/trying-to-create-a-perpendicular-helical-slot/25598 "2023-05-02T03:03:14Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Coffee](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/coffee/32/17451_2.png) [@Coffee](https://discourse.shapr3d.com/u/Coffee)\
**Post date:** [May 2, 2023, 3:03am UTC](https://discourse.shapr3d.com/t/trying-to-create-a-perpendicular-helical-slot/25598/1 "2023-05-02T03:03:14Z")

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Hi folks…  
I am trying to make a nurf Gatling gun and I am lost on how to create the slot/track the breach rams need to follow. The slot is not a thread. Its a sine wave up and down like a fishing line bobbin winder. I can’t get the correct helical shape using revolve. This is more like a cam follower slot.  
I attached a image of what I am trying to do. I can not find a method to keep the bottom and top of the slot perpendicular to the Z plane, Sweeping doesn’t work because Shapr3D does not rotate the selected profile as it follows the path. It’s hard to explain. I hope someone can understand this and help.  
I am attaching another image of what a milled slot would look like. This is the profile I am trying to achieve.

 ![lost](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/0/9/098ad01cbccfcd7d72e4f68239c700fdc37d4933.png)  
 ![cam follower](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/e/b/ebace82c4072ed15a128494732d7ce1cf2436ab3.png)

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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:** [May 2, 2023, 4:42am UTC](https://discourse.shapr3d.com/t/trying-to-create-a-perpendicular-helical-slot/25598/2 "2023-05-02T04:42:45Z")

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Here is a way to make a perpendicular slot using **Project**. Hope this helps.

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**Author:** ![Coffee](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/coffee/32/17451_2.png) [@Coffee](https://discourse.shapr3d.com/u/Coffee)\
**Post date:** [May 2, 2023, 2:11pm UTC](https://discourse.shapr3d.com/t/trying-to-create-a-perpendicular-helical-slot/25598/3 "2023-05-02T14:11:31Z")

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You really know your stuff!  
Thank you!!