Guitar centerline finder for neck set and bridge positioning

My take on a centerline finder

For a proper neck set and bridge positioning on my guitar builds a want to build my one centerline finder. This project I designed in Autodesk Fusion 360. The files can be downloaded under


The Fusion 360 construction include all parts except the six woodscrews for mounting the nuts and the bolts.


The tool paths for milling I also generated in Fusion 360.


The first part I have build is the ruler. This part is milled out of transparent acryl.

04_ruler 05_first_side 06_cutting_raw_wide

The milling I have done on my CNC that’s controlled by Mach3.

07_milling_wide 08_slotting

Beside centering the neck I decided to add a scale to check an realign the bridge if needed.


The centering will be done by four bolts, that are sliding in four angled slots. Each pair of this bolts are pushed by a t-glide in a center slot through links. One of these links on a pair has a washer, so it’s laying parallel to the surface of the ruler.

10_links 11_washers 12_milling_links

The T-Glides I made out of plywood. I milled a pair out of a 20 mm thick peace.

13_t-glides 14_milling_t_glides

On the band saw I have cut the peace’s out.


The bolts and the nuts I turned out of a round peace of beech wood.

16_bolts17_turning_bolts18_nuts 19_turning_nuts

With prethreading the T-Glide I’ve made sure, I can lock the centered position.


With gluing in the wood screw in the nut turns always with the screw.


The first Test:


The same reading, as I measured with a stared edge, but a lot faster.


The hole build on a YouTube Video:

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