# How to knurl a knob

**URL:** <https://discourse.shapr3d.com/t/how-to-knurl-a-knob/6580>\
**Category:** Modeling Questions\
**Created:** [February 4, 2020, 1:41pm UTC](https://discourse.shapr3d.com/t/how-to-knurl-a-knob/6580 "2020-02-04T13:41:29Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![jrhjrh](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@jrhjrh](https://discourse.shapr3d.com/u/jrhjrh)\
**Post date:** [February 4, 2020, 1:41pm UTC](https://discourse.shapr3d.com/t/how-to-knurl-a-knob/6580/1 "2020-02-04T13:41:29Z")

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I’m sure this is obvious to those that know, but I can’t think how to draw this. I’m crating a knob for an old radio. Around the edge it is knurled, and I can’t work out how to do this. Clearly, you start out with a circle, but what then. I don’t want to individually draw every indentation manually.

 ![knurled_knob](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/f/f61220e7d4924e1f80da5fb33f5a72a80886ce41.jpeg)  
If I’ve done this correctly, here is a picture of the original knob.

Thank you for any suggestions on how to do this.

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**Author:** ![4dxp](https://avatars.discourse-cdn.com/v4/letter/4/57b2e6/32.png) [@4dxp](https://discourse.shapr3d.com/u/4dxp)\
**Post date:** [February 4, 2020, 2:35pm UTC](https://discourse.shapr3d.com/t/how-to-knurl-a-knob/6580/2 "2020-02-04T14:35:33Z")

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This is the best way right now I think:

> [@Circular pattern](https://discourse.shapr3d.com/t/circular-pattern/3195):
>
> Could you show me a more straight forward way to duplicate a 0.015 mm radius circle over another circle of 5.25 mm diameter for every 7.5 degree. I’ve attached the vid of my own solution. Thanks

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**Author:** ![jrhjrh](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@jrhjrh](https://discourse.shapr3d.com/u/jrhjrh)\
**Post date:** [February 4, 2020, 5:52pm UTC](https://discourse.shapr3d.com/t/how-to-knurl-a-knob/6580/3 "2020-02-04T17:52:17Z")

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Thanks for responding. Unfortunately I don’t follow the video, despite looking at it multiple times. Can someone write some words as to what is being done there?

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**Author:** ![Victor\_Shapr3D](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/victor_shapr3d/32/3502_2.png) [@Victor\_Shapr3D](https://discourse.shapr3d.com/u/Victor_Shapr3D)\
**Post date:** [February 5, 2020, 10:02am UTC](https://discourse.shapr3d.com/t/how-to-knurl-a-knob/6580/4 "2020-02-05T10:02:43Z")

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Hi, as seen in the video, you can create one arc connected to the large circle(which will be used to extrude out parts to create the knurled edge)  
Tap on the arc to select it  
Tap on Transform and select the Move/Rotate option  
Move the transform direction arrows to the centre of the circle  
Tap on copy badge and the rotate the selected arc around the circle to make duplicate copies of the arc

Here’s a link to a short screen recording showing how make multiple duplicates at the same time:

> **[RPReplay\_Final1580894760.mov](https://share.getcloudapp.com/mXumwRBJ)**
>
> Shared with CloudApp

I hope that this is somewhat helpful.

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<div class="post-metadata">

**Author:** ![jrhjrh](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@jrhjrh](https://discourse.shapr3d.com/u/jrhjrh)\
**Post date:** [February 5, 2020, 12:32pm UTC](https://discourse.shapr3d.com/t/how-to-knurl-a-knob/6580/5 "2020-02-05T12:32:32Z")

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Thanks - I will try this out tonight. Your input is much appreciated.