I started this project before finding Flavortown, so I was already partway through when I began posting devlogs. The project is a LEGO inline-3 vacuum engine with a custom multi-speed gearbox.
So far, I’ve been working mainly on the gearbox. I designed a servo-driven shift gate and shifter, assembled the 3D printed gearbox parts to check fit, and revised parts like the reverse gear and shaft spacers to fix alignment issues. Most of the work has been iterating between CAD and test fits, adjusting designs as problems come up.
The goal is to have the gearbox shift automatically using servos based on engine RPM. Next, I’ll keep refining the mechanical parts and start integrating everything more closely with the engine and control system.
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