Split/Adjustable V Belt Pulley

thingiverse

I came up with a split/adjustable V Belt pulley trying to solve the problem of attaching a fixed motor to a pulley. This solution allows for assembly under tension, eliminating the need for a tensioner or adjustable motor mounts because my motor was fixed. The design features shims (or washers) that can be added between the halves to change the outer diameter of the pulley. A smaller pulley shown here doesn't have much adjustment, but a larger one I originally designed had approximately 9mm of adjustment, enabling an outer diameter of up to 120mm and down to 102mm. When using 3D printed pulleys in high-speed applications, precautions must be taken as they can become flying debris if they come apart at speed. This design is only a temporary solution for myself, and I plan to machine one from aluminum once my lathe starts running. The 3D model has been modified to suit my 3D printer with oversized holes. The main bore is 0.2mm larger, the hex is 0.4mm bigger, and the holes are also 0.2mm larger than usual. An STL model of an 80mm pulley with a 24mm bore is available, along with Sketch-up files containing both 120mm and 80mm pulleys. This listing aims to share the idea, as it can easily be adapted in various sizes and bores using Sketch-up.