This was a Gamma-type Stirling Engine I built for a Machine Design and Manufacturing class. Stirling engines are a type of heat engine that run off of the thermodynamic properties of air as it moves across a temperature differential.
The 23 Parts (not including fasteners and fixtures) were made out of 6061 aluminum, brass, and stainless steel that I machined on a CNC mills and manual lathes. I also lasercut and milled acrylic base panels and 3D printed a horn to create a gramophone aesthetic. The final engine reached over 2000rpm in testing.