# Lofting a guitar neck

**URL:** <https://discourse.shapr3d.com/t/lofting-a-guitar-neck/35258>\
**Category:** Modeling Questions\
**Created:** [November 21, 2024, 6:35pm UTC](https://discourse.shapr3d.com/t/lofting-a-guitar-neck/35258 "2024-11-21T18:35:02Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![mjhillsc](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@mjhillsc](https://discourse.shapr3d.com/u/mjhillsc)\
**Post date:** [November 21, 2024, 6:35pm UTC](https://discourse.shapr3d.com/t/lofting-a-guitar-neck/35258/1 "2024-11-21T18:35:02Z")

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I am trying to use a sketch on two planes to loft from a semi-circle shape to essentially a rectangle, but get a very smooth curve (see photo). For the life of me, I can seem to find a way to do this. I will upload a photo of the real thing as well as a screen grab of how I am envisioning using planes to sketch on. I have tried lofting through multiple sketches, but that isn’t working either. Any suggestions would be greatly appreciated!

 ![Screenshot 2024-11-21 at 10.27.58 AM](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/2/0/20648d30fcdc899826f96571b570f477b66dc400.jpeg)  
 ![Screenshot 2024-11-21 at 10.28.18 AM](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/d/0/d0c0b69ab1c8a80593d23a9eeed0c2a9db90fb3e.jpeg)

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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:** [November 22, 2024, 10:24am UTC](https://discourse.shapr3d.com/t/lofting-a-guitar-neck/35258/2 "2024-11-22T10:24:57Z")

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Hi @mjhillsc

Welcome to the forum.

You have almost done the job yet.  
The rectangle has 4 summits so the solution is to draw 4 guides for the loft tool.  
The trick is to draw 2 guides, ending on the rounded side of the guitar handle, at some distance from each other, otherwise the loft would fail.  
I created 2 construction planes using 3 points each time to define them, and draw the guides using 3 points control mode spline.  
To ensure tangency of the guides, I also project some edge or line to the sketches and use the tangent constraint between them and the guides.

[Guitar neck LOFT.shapr](https://discourse.shapr3d.com/uploads/short-url/7UqxsFSSAISaB3uUAz4S5H2649k.shapr) (3.2 MB)

 ![Guitar neck](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/0/9/09d7b494b0e0de2246ce69f6593cabd4469669f3.jpeg)

The video shows the whole process.

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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:** [November 22, 2024, 10:43am UTC](https://discourse.shapr3d.com/t/lofting-a-guitar-neck/35258/3 "2024-11-22T10:43:05Z")

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And of course you can play with the fillets to get a better transition to the handle.

 ![CleanShot 2024-11-22 at 11.39.01@2x](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/6/8/68ec03fa32c0aceb1b0af5ab48a89a8f22deac41.jpeg)  
 ![guitar neck 2](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/8/7/87f5e0b49d7b9c73cbdfa6ccea5fce66bfc0ff87.jpeg)  
[Guitar neck LOFT2.shapr](https://discourse.shapr3d.com/uploads/short-url/vcZnW09BT5enfRAxYP3lgrM8fVk.shapr) (3.3 MB)

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<div class="post-metadata">

**Author:** ![mjhillsc](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@mjhillsc](https://discourse.shapr3d.com/u/mjhillsc)\
**Post date:** [November 22, 2024, 3:15pm UTC](https://discourse.shapr3d.com/t/lofting-a-guitar-neck/35258/4 "2024-11-22T15:15:15Z")

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@PEC this is incredibly helpful. The video is excellent and easy to follow. Thank you! Thank you!!

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**Author:** ![mjhillsc](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@mjhillsc](https://discourse.shapr3d.com/u/mjhillsc)\
**Post date:** [November 28, 2024, 11:50pm UTC](https://discourse.shapr3d.com/t/lofting-a-guitar-neck/35258/5 "2024-11-28T23:50:36Z")

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Well, this hasn’t been easy! But, thanks to @PEC video, and lots of trial and error (heavy on the error side), I got what I was after.

 ![Screenshot 2024-11-28 at 3.47.45 PM](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/7/7/7776b9a6ac97dab9cce0a8352c927ef675b463ef.jpeg)  
 ![Screenshot 2024-11-28 at 3.48.11 PM](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/e/6/e6092bdfb1bec499db6a39a6c530966209738385.jpeg)