# Multi Radius design

**URL:** <https://discourse.shapr3d.com/t/multi-radius-design/31208>\
**Category:** Modeling Questions\
**Created:** [April 9, 2024, 2:28pm UTC](https://discourse.shapr3d.com/t/multi-radius-design/31208 "2024-04-09T14:28:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Donnercruz](https://avatars.discourse-cdn.com/v4/letter/d/7ba0ec/32.png) [@Donnercruz](https://discourse.shapr3d.com/u/Donnercruz)\
**Post date:** [April 9, 2024, 2:28pm UTC](https://discourse.shapr3d.com/t/multi-radius-design/31208/1 "2024-04-09T14:28:10Z")

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Working on a guitar design.

With the finger board, I have the 2d done, but am unsure how to proceed with getting it to 3d with the following restriction. It needs to be 1/4” tall at the center line, with a 9.5” radius at the narrow end and a 12”radius at the wide end. It seems to be really easy if it was a continuous radius all the way, just extrude a rectangle, draw at the end and eliminate the excess of the rectangle using the curve. But I’m unsure how to do it when the curve changes over the surface.

 ![IMG_0604](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/a/4/a41e4c94f10ae5628711e98374583d132e5f06f4.jpeg)

> **[Submit a request – Shapr3D Help Center](https://support.shapr3d.com/hc/en-us/requests/new)**

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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:** [April 9, 2024, 3:24pm UTC](https://discourse.shapr3d.com/t/multi-radius-design/31208/2 "2024-04-09T15:24:33Z")

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I would use loft to create this curvature and then subtract it from extruded body of finger board.

Or use loft to create body itself.

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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 9, 2024, 4:26pm UTC](https://discourse.shapr3d.com/t/multi-radius-design/31208/3 "2024-04-09T16:26:28Z")

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I agree with @Xdrakosha that loft is the way to go. Here’s a way that might work albeit a bit unconventional.

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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:** [April 9, 2024, 4:46pm UTC](https://discourse.shapr3d.com/t/multi-radius-design/31208/4 "2024-04-09T16:46:43Z")

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Here is my example

[https://videos.tsbl.net/example\_035.mov](https://videos.tsbl.net/example_035.mov)

I’m not a guitar fan, so I’m not sure it should looks like that, but hope the conception is clear.