Boxer / Flat-Four Engine

thingiverse

Human designed this as a birthday gift for a mechanic with the intention of demonstrating the way a flat engine works in simple terms. The crankshaft is a bit fragile when turning, so some care must be taken not to damage it. When assembling the model, make sure not to tighten the screws too much, or there may be excessive friction between the pistons and cylinders. To share your results with me, simply let me know how the connections work out, and I might upload a customizable model that allows you to adjust tolerances between parts to suit your needs. All moving parts were printed with black filament, while the housing was made using Velleman's Neutral, which is somewhat transparent. This allows for clear visibility of engine movement. After printing, several post-processing steps need to be taken: 1. Surface treatment: To achieve smooth gliding of pistons, simply sand all parts. 2. Assembly: Simply snap the connecting rods onto the crankshaft and place the pistons on them. Next, place everything into one half of the housing, then carefully attach the second half on top. Try turning the crankshaft to test its movement. Mount the housing using two M3x16 screws or a similar length. Tighten them just enough so that the crankshaft still turns smoothly.