Most manufacturers and some independent luthiers use CNC machines to build their guitars. The process starts with drawing a design on the computer. My favorite program for doing this is Rhinoceros. Rhino (for short) is a powerful 3-D drafting and rendering program which can be downloaded at rhino3D.com. It offers a 90-day free trial, and students can purchase a license for only $199. There are plenty of help files in the program, and many tutorial videos can be found on YouTube and Vimeo.
For this demonstration, I will be drawing a Telecaster body. The steps are as follows:
1. First, import a picture of a Telecaster by using the “picture” command in the software. A box will open up, where you can choose an image file from your hard drive. You can also import a pen or pencil sketch. It just needs to be a .jpeg or similar image.
![](https://nashville.mi.edu/wp-content/uploads/457E2FDCAC49435CA7B467C092F8D6F3-1080x586.jpg)
2. Place points around the body.
![](https://nashville.mi.edu/wp-content/uploads/B5832CFE667F43F085B3FB1543CE76A6-1080x760.jpg)
3. Hide the picture and connect the points using the “curve-interpolated points” command. I will then scale the drawing to actual size.
![](https://nashville.mi.edu/wp-content/uploads/7AD3E4313F5F45CDA09BC18E801B14B4-1080x967.jpg)
4. Draw the rest of the curves for the body pockets.
![](https://nashville.mi.edu/wp-content/uploads/BDB5B5DF4A764A76AE1DEE4F9E5600E3-1080x770.jpg)
The above steps are all that is required to create the part with the machine. Although, you can also extrude the curves to get a three-dimensional view of the part.
![](https://nashville.mi.edu/wp-content/uploads/2BF6322E71EC4E48BB2EEFC5101A773F-1080x747.jpg)
You can even go a step further by rendering the part with a material, which in this case is maple.
![](https://nashville.mi.edu/wp-content/uploads/F92FCCB126B947C3BE0EEAAE001BCC91-1080x767.jpg)
Once you’re satisfied with the design, export it as a DXF file and import it to another program to calculate the various tool paths for the CNC machine.