My goal is to model the parts for a guitar in FreeCAD and Blender, and then use Blender to make sure they will work before I have them made. I've started with the tuners, which consist of a screw turning a gear (and a post attached to the gear, and a little handle and enclosure).
I've figured I need to constrain the position of both main parts, and limit their rotation. But I can't figure out the best way to rotate my parts. The game engine doesn't seem to use precise enough collision detection, and I have trouble making my screw spin with regular Blender physics. I've tried adding wind to spin the screw, adding a vortex force to the screw, tweaking the weights of the objects, and nothing really works.
Here's the blend file.