Before starting with this Instructable, I would like to express my sincere thanks to Instructables for featuring Single Cylinder Air Engine. I am indeed honored and humbled, again, many thanks.
Single Cylinder Air Engine runs on compressed air, a vacuum cleaner, a balloon, or even lung power. I've included three adapters in the design to interface with each. Please note the friction test video; your engine needs to pass this test before being successfully operated on balloon power.
The design incorporates two ports, one upper and one lower. When Single Cylinder Air Engine is viewed from the port side, "Wheel Piston.stl" rotates clockwise when pressure is applied to the upper port, and counter clockwise when a vacuum is applied to the upper port. As pressure or vacuum is applied to the upper port, the lower port functions as an exhaust (when pressure is applied) or an intake (when vacuum is applied). The opposite occurs when the lower port is used for pressure or vacuum.
I probably forgot a file or two or something, so if you have any questions, please feel free to ask.
Designed using Autodesk Fusion 360, sliced using Cura 2.3.1, and printed in PLA on an Ultimaker 3 Extended.
I printed my parts on an Ultimaker 3 Extended using .1mm vertical resolution and 100% infill.
"Base.stl" must be printed using supports. "Cylinder Piston 484.stl" must not be printed with supports.
Prior to assembly, test fit and trim, file, sand, etc. all parts as necessary for smooth movement of moving surfaces, and tight fit for non moving surfaces. Depending on the colors you chose and your printer settings, more or less trimming, filing and/or sanding may be required. Please view the friction test video and review the associated description for friction testing.
Carefully file all edges that contacted the build plate to make absolutely sure that all build plate "ooze" is removed and that all edges are smooth. I used a flat jewelers file and plenty of patience to perform this step.
Study "Assembly.stl" and "Assembly Exploded.stl", carefully noting the locations and positions of the various components as assembly proceeds.