# Failed to Substract from revolved body

**URL:** <https://discourse.shapr3d.com/t/failed-to-substract-from-revolved-body/18976>\
**Category:** Modeling Questions\
**Created:** [April 25, 2022, 6:18am UTC](https://discourse.shapr3d.com/t/failed-to-substract-from-revolved-body/18976 "2022-04-25T06:18:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ThomasR](https://avatars.discourse-cdn.com/v4/letter/t/a87d85/32.png) [@ThomasR](https://discourse.shapr3d.com/u/ThomasR)\
**Post date:** [April 25, 2022, 6:18am UTC](https://discourse.shapr3d.com/t/failed-to-substract-from-revolved-body/18976/1 "2022-04-25T06:18:07Z")

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I’d like to create a phase to a thread (Revolved body).  
To get there, I create a dummy body and substract it from the thread - most of the time it fails.  
Download example file: [Failed Substract Example.shapr](https://www.dropbox.com/s/rbfo0mt8x73mrh4/Failed%20Substract%20Example.shapr?dl=1)

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**Author:** ![Rohan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/rohan/32/15410_2.png) [@Rohan](https://discourse.shapr3d.com/u/Rohan)\
**Post date:** [April 25, 2022, 2:16pm UTC](https://discourse.shapr3d.com/t/failed-to-substract-from-revolved-body/18976/2 "2022-04-25T14:16:37Z")

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That is weird. But you can subtract the head before adding the thread.

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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:** [April 25, 2022, 4:08pm UTC](https://discourse.shapr3d.com/t/failed-to-substract-from-revolved-body/18976/3 "2022-04-25T16:08:27Z")

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The body you want to subtract has a circular cavity that is a profile of your thread. I removed that cavity and now it can be subtracted from the revolved body. I assume this what you wanted to do.

[https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/3/38b37219bb2f4d0e101be4ba371985640316c843.mov](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/3/38b37219bb2f4d0e101be4ba371985640316c843.mov)

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**Author:** ![ThomasR](https://avatars.discourse-cdn.com/v4/letter/t/a87d85/32.png) [@ThomasR](https://discourse.shapr3d.com/u/ThomasR)\
**Post date:** [April 25, 2022, 7:04pm UTC](https://discourse.shapr3d.com/t/failed-to-substract-from-revolved-body/18976/4 "2022-04-25T19:04:13Z")

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Thanks a lot!