# Guitar tuner. How to make perpendicular gear tooth?

**URL:** <https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519>\
**Category:** Modeling Questions\
**Created:** [December 9, 2024, 7:46pm UTC](https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519 "2024-12-09T19:46:49Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![LongHui](https://avatars.discourse-cdn.com/v4/letter/l/3ab097/32.png) [@LongHui](https://discourse.shapr3d.com/u/LongHui)\
**Post date:** [December 9, 2024, 7:46pm UTC](https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519/1 "2024-12-09T19:46:49Z")

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> **[GUITAR TUNERS that actually work!! by noamtsvi | Download free STL model |...](https://www.printables.com/model/473276-guitar-tuners-that-actually-work/files)**
>
> 2nd version of my guitar tuners. works with steel strings. | Download free 3D printable STL models

How do I recreate the perpendicular thread seen in this guitar tuner in Shapr3D? Alternatively, I want to learn more about threads/ gear in general (this one is perpendicular, can I do something else?). Resources recommendations would be nice.  
Thanks all

Context, I want to recreate the tuner since I am trying to build a guitar a headless guitar. No clue how to recreate those headless guitar tuner

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**Author:** ![LongHui](https://avatars.discourse-cdn.com/v4/letter/l/3ab097/32.png) [@LongHui](https://discourse.shapr3d.com/u/LongHui)\
**Post date:** [December 9, 2024, 8:20pm UTC](https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519/2 "2024-12-09T20:20:56Z")

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![IMG_1180](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/6/b/6b31a4ae453bf413ee584abc856239c7d950d7b3.jpeg)  
alternatively, how do I recreate something like these

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**Author:** ![TheBum](https://avatars.discourse-cdn.com/v4/letter/t/eada6e/32.png) [@TheBum](https://discourse.shapr3d.com/u/TheBum)\
**Post date:** [December 10, 2024, 12:13am UTC](https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519/3 "2024-12-10T00:13:56Z")

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Have you tried McMaster-Carr? They sell gears and have STEP files for them that you can import into Shapr.

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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:** [December 10, 2024, 12:54am UTC](https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519/4 "2024-12-10T00:54:57Z")

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[![](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/e/b/ebbfa24513fa62e4f982016b39c59a32764b2bbe.jpeg "Modeling Bevel Gear on iPad | Shapr3D") ](https://www.youtube.com/watch?v=VnJOXkAy1DM)

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**Author:** ![PEC](https://avatars.discourse-cdn.com/v4/letter/p/67e7ee/32.png) [@PEC](https://discourse.shapr3d.com/u/PEC)\
**Post date:** [December 10, 2024, 5:20pm UTC](https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519/5 "2024-12-10T17:20:16Z")

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Hi,

NCAD videos are a great source of ideas.

For your specific need, you must use a worm gear, because it is the only gear that is not reversible: it means that you can rotate the yellow worm and the blue gear will rotate also, but what ever the torque the guitar’s string will apply to the blue gear, it will never rotate by it’s own.  
(This is due to the friction coefficient’s angle being higher than the helix’s angle).

Worm gear also provide large reduction ratio in a compact design, because for each turn of the worm, the gear will rotate by just one tooth, which is require for precise tuning of the string.

[![](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/e/1/e178ca684279f8542a823d1fbf1956f563d0db58.jpeg "Modeling Worm Gear on iPad | Shapr3D") ](https://www.youtube.com/watch?v=kRVzs3CA_b0)

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<div class="post-metadata">

**Author:** ![LongHui](https://avatars.discourse-cdn.com/v4/letter/l/3ab097/32.png) [@LongHui](https://discourse.shapr3d.com/u/LongHui)\
**Post date:** [December 11, 2024, 9:51am UTC](https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519/6 "2024-12-11T09:51:02Z")

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I see. Very good explanation. I was hoping to reduce the size of the tuner. This video is very useful, and this is the right idea I believe. Thanks

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<div class="post-metadata">

**Author:** ![LongHui](https://avatars.discourse-cdn.com/v4/letter/l/3ab097/32.png) [@LongHui](https://discourse.shapr3d.com/u/LongHui)\
**Post date:** [December 11, 2024, 9:52am UTC](https://discourse.shapr3d.com/t/guitar-tuner-how-to-make-perpendicular-gear-tooth/35519/7 "2024-12-11T09:52:25Z")

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@TheBum @Oregonerd thanks for your reply. PEC’s video is the solution I was looking for