Anemometer

thingiverse

This is a DIY anemometer that I designed using FreeCAD for use in a larger project, a weather station which is still under development. The central part has been engineered to connect with the rotary component and two M5 ball bearings. I chose the 625 ball bearing from the RepRap wiki (http://reprap.org/wiki/Ball_bearing) because it's used in some RepRap printers and can be easily obtained at most 3D printing stores. You will need to print two pieces of this design. The lower part is designed to hold a magnet and rotate at the same speed as the component that catches wind, allowing me to use a Hall effect sensor to measure wind speed. This part was based on: http://www.thingiverse.com/thing:19439, made by http://www.thingiverse.com/rlittin/about but redesigned in FreeCAD and scaled up.