As part of my voice panning fixture—which I’ve been working on and hope to show off a completed version very soon—I had to modify a hobby servo for continuous rotation. This is not a new technique, but it’s something I’ve been putting off learning how to do for quite some time. I was surprised at how simple it was, and after modifying the servo I had for the project, bought another model and made a video of the process.
As seen in the video, doing this mod involved taking out the potentiometer and replacing it with two resistors, basically tricking it into thinking it still needs to move to reach its position. Also, you have to cut out a piece of one of the gears that physically interferes with it moving 360 degrees. Somehow I lost the video where I used a Dremel on it, but at least I had the part where I finished in with a file.
The first servo that I modded had wires going to the potentiometer, rather than it being attached directly. As seen in the gallery below,