# Radius extrusion

**URL:** <https://discourse.shapr3d.com/t/radius-extrusion/39314>\
**Category:** Modeling Questions\
**Created:** [September 1, 2025, 8:30pm UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314 "2025-09-01T20:30:42Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![ALloyd](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@ALloyd](https://discourse.shapr3d.com/u/ALloyd)\
**Post date:** [September 1, 2025, 8:30pm UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/1 "2025-09-01T20:30:42Z")

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I am trying to extrude the two 4mm holes following the radius of the inside part of the circle or vertical blue line so it cuts out a 4mm path out of the part. I can rotate it on the axis, but it doesn’t cut it out of the part. I can extrude it, but can’t find out how to follow the radius. Any ideas? Thanks in advance. I can send the file if you would like.

 ![IMG_1517](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/0/b/0b58136b711a2080eb1c6fa2333cf85c17a5d624.jpeg)

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**Author:** ![Oregonerd](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/oregonerd/32/8012_2.png) [@Oregonerd](https://discourse.shapr3d.com/u/Oregonerd)\
**Post date:** [September 1, 2025, 8:50pm UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/2 "2025-09-01T20:50:49Z")

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Revolve the circles and subtract the results

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**Author:** ![SCALEMODEL](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@SCALEMODEL](https://discourse.shapr3d.com/u/SCALEMODEL)\
**Post date:** [September 1, 2025, 9:21pm UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/3 "2025-09-01T21:21:15Z")

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Another option, you can take the circular sketch and sweep along the circular edge.

You can use that circular cylinder to subtract.

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**Author:** ![Xdrakosha](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/xdrakosha/32/24881_2.png) [@Xdrakosha](https://discourse.shapr3d.com/u/Xdrakosha)\
**Post date:** [September 1, 2025, 11:09pm UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/4 "2025-09-01T23:09:14Z")

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In my opinion sweep is the best choice here

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**Author:** ![ALloyd](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@ALloyd](https://discourse.shapr3d.com/u/ALloyd)\
**Post date:** [September 2, 2025, 12:23am UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/5 "2025-09-02T00:23:23Z")

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![IMG_1526](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/d/a/da7e572500050b3d7c08c7683845c22044e3e728.jpeg)

For some reason, after I hit Done after the sweep, it added the circles outward and not completed the sweep. What have I done to screw this up? Your video helped a ton, but something is wrong with my file.

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**Author:** ![ALloyd](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@ALloyd](https://discourse.shapr3d.com/u/ALloyd)\
**Post date:** [September 2, 2025, 12:28am UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/6 "2025-09-02T00:28:37Z")

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I got it to work using the Revolve tool and then Subtract the rings from the main part. Thanks for the help guys.

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**Author:** ![ALloyd](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@ALloyd](https://discourse.shapr3d.com/u/ALloyd)\
**Post date:** [September 2, 2025, 12:29am UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/7 "2025-09-02T00:29:30Z")

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I got it to work using the Revolve tool and then the Subtract tool on each ring it made. Thanks for the help.

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**Author:** ![SCALEMODEL](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@SCALEMODEL](https://discourse.shapr3d.com/u/SCALEMODEL)\
**Post date:** [September 2, 2025, 12:54am UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/8 "2025-09-02T00:54:30Z")

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So when I first saw your example, I was confused.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/4/8/48bc89d7d63f0efb18908ee943467f0f2a0a4a89.jpeg)

The side face including circle sketch should have been highlighted all purple, I thought it was some visual glitch.

But there is a offset betwee the face and the sketch.

So the sweep was too short.

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<div class="post-metadata">

**Author:** ![ALloyd](https://avatars.discourse-cdn.com/v4/letter/a/977dab/32.png) [@ALloyd](https://discourse.shapr3d.com/u/ALloyd)\
**Post date:** [September 2, 2025, 1:29pm UTC](https://discourse.shapr3d.com/t/radius-extrusion/39314/9 "2025-09-02T13:29:09Z")

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Thank you Scalemodel. You’re right, I didn’t realize my plane wasn’t on the end. After I deleted it, I was able to make it work the way I wanted. Thank you for the help.